| Names | |
|---|---|
| Preferred IUPAC name | furan-2,5-dione |
| Other names | cis-Butenedioic anhydride Toxilic anhydride Dihydro-2,5-dioxofuran 2,5-Furandione Maleic acid anhydride C4H2O3 |
| Pronunciation | /meɪˈliːɪk ænˈhaɪdraɪd/ |
| Identifiers | |
| CAS Number | 108-31-6 |
| Beilstein Reference | 385873 |
| ChEBI | CHEBI:37141 |
| ChEMBL | CHEMBL14024 |
| ChemSpider | 818 |
| DrugBank | DB14088 |
| ECHA InfoCard | 100.003.263 |
| EC Number | 204-658-1 |
| Gmelin Reference | 1101 |
| KEGG | C00476 |
| MeSH | D008288 |
| PubChem CID | 962 |
| RTECS number | OJ4375000 |
| UNII | V5F4N2I1O3 |
| UN number | UN2215 |
| Properties | |
| Chemical formula | C4H2O3 |
| Molar mass | 98.06 g/mol |
| Appearance | White crystalline solid |
| Odor | Pungent, choking odor |
| Density | 1.48 g/cm3 |
| Solubility in water | Reacts with water |
| log P | -0.73 |
| Vapor pressure | 0.2 mmHg (25°C) |
| Acidity (pKa) | pKa1 = 1.9, pKa2 = 6.07 |
| Basicity (pKb) | 1.45 |
| Magnetic susceptibility (χ) | -38.4·10⁻⁶ cm³/mol |
| Refractive index (nD) | 1.554 |
| Viscosity | 2.5 – 4.0 cP |
| Dipole moment | 4.78 D |
| Thermochemistry | |
| Std molar entropy (S⦵298) | 284.00 J·mol⁻¹·K⁻¹ |
| Std enthalpy of formation (ΔfH⦵298) | -447.0 kJ/mol |
| Std enthalpy of combustion (ΔcH⦵298) | -1790 kJ·mol⁻¹ |
| Pharmacology | |
| ATC code | V04CX |
| Hazards | |
| GHS labelling | GHS02, GHS05, GHS07 |
| Pictograms | GHS02,GHS05,GHS07,GHS08 |
| Signal word | Warning |
| Hazard statements | H302, H314, H317, H334, H335, H341, H351 |
| Precautionary statements | P261, P280, P301+P330+P331, P305+P351+P338, P304+P340, P312, P337+P313 |
| NFPA 704 (fire diamond) | 2-2-2-W |
| Flash point | 52.8 °C |
| Autoignition temperature | 435°C |
| Explosive limits | 1.4–7.1% (in air) |
| Lethal dose or concentration | LD₅₀ oral rat 2,400 mg/kg |
| LD50 (median dose) | LD50 (median dose): 2,400 mg/kg (rat, oral) |
| NIOSH | K0147 |
| PEL (Permissible) | PEL = "1 ppm (as 8-hour TWA) |
| REL (Recommended) | 30 mg/m3 |
| IDLH (Immediate danger) | 250 ppm |
| Related compounds | |
| Related compounds | Fumaric acid Maleic acid Phthalic anhydride Succinic anhydride Malic acid |
| Product Name | Maleic Anhydride |
|---|---|
| IUPAC Name | 2,5-Furandione |
| Chemical Formula | C4H2O3 |
| CAS Number | 108-31-6 |
| Synonyms & Trade Names | MA; cis-Butenedioic anhydride; Toxilic anhydride; Furan-2,5-dione |
| HS Code & Customs Classification | 2917.14 |
Maleic anhydride stands as a key reactive intermediate produced as a white solid at ambient conditions. The process choice for manufacturing depends on market requirements, available feedstocks, and efficiency goals. The most widely adopted route leverages selective oxidation of n-butane or benzene over vanadium-phosphorus oxide catalysts. n-Butane is now generally preferred over benzene for occupational safety, feedstock cost, and regulatory compliance.
Control of raw material purity impacts both process yield and the impurity load in the final product. Trace organics and byproducts generated during vapor-phase oxidation, such as maleic acid, fumaric acid, or acrylic acid, are monitored continuously by inline GC systems. The purification of crude maleic anhydride relies on distillation under reduced pressure. Polymerization inhibitors and care with thermal management limit the formation of oligomers during storage and transport.
Physical properties relevant to storage and transportation include melting point, which typically falls close to 52.8°C for nominal purity grades but can be influenced by specific trace impurities and water content. Final release often depends on visual clarity, melting range, acidity, and color stability. The product shows notable hygroscopicity: storage in moisture-controlled and inert-gas blanketed environments prevents hydrolysis to maleic acid. Bulk storage facilities use heated systems with recirculation to prevent solidification in pipes and tanks. Packaging in drums or ISO tanks for shipment requires routine checks for color drift and acid number stability, both affected by transit conditions and time-in-storage.
Downstream processing applications—including unsaturated polyester resin, lubricant additive, and surface sizing production—require well-defined purity and low-odor profiles. Formulators often specify limits on specific isomeric or organic impurities and residual catalyst metals. The selection of grade for application depends on compatibility with customer process technologies and end-use certifications.
Customs classification under HS code 2917.14 focuses on anhydrides of carboxylic acids, which influences export documentation, duty rates, and destination market requirements. Compliance with international transport safety regulations is managed through standard labeling, internal lot tracking, and documentation per current conventions.
In our production units, maleic anhydride leaves the reactor as a white, needle-like crystalline solid at ambient conditions. The transition from flake or molten forms dictates downstream handling. At elevated temperatures in the process line, it takes on a colorless liquid phase. A sharp, irritating odor is always present in vapor phase, prompting exhaust ventilation at transfer points.
Melting and boiling characteristics are grade-agnostic in pure product but may drift with limited impurities. Our engineering limits atmospheric exposure due to the pronounced sublimation near room temperature. Flash point varies with contamination by organics or trace solvents from incomplete stripping. Density assessment forms part of every batch release as hydroscopic contamination or fines influence this parameter in packaging and transfer operations.
Maleic anhydride reacts readily with water, alcohols, and amines. Reactivity increases as particle surface area and temperature rise, impacting storage choices and transfer protocol. Moisture ingress during bulk storage catalyzes hydrolysis, producing maleic acid—impacting both quality profile and downstream usability. In process, control over temperature and atmospheric moisture reduces risk of runaway exotherms, especially during venting, blending, or post-reactor cooling.
Solubility in water remains low, but rapid hydrolytic reaction limits direct aqueous blending. Appropriate solvent selection is grade-driven. Quality control personnel track exothermic effects and pH as indicators of incomplete solvation or uncontrolled hydrolysis. Solid-to-liquid addition order and agitation profile form core safety controls in dissolution plants or when preparing stock solutions for polymerization or esterification lines.
Grades for resin, agricultural, and chemical synthesis markets vary on limits for color (APHA), organic acids, iron, and phthalic anhydride impurity. Formal release criteria and test frequency reflect customer qualification protocols. Detailed specifications get defined per customer and contract requirements, following validation of the intended downstream use.
Impurities originate in feedstock, catalyst, or via secondary side reactions. Most concern arises from phthalic anhydride, maleic acid, iron, and ash. Routine process monitoring targets reduction of high-boiling organics during refining, with in-line sensors for color and thermal degradation products tracked by production and QC staff.
Testing protocols align with recognized standards such as ASTM, ISO, or regional equivalents—set based on customer markets and end-use. Key tests include gas chromatography for purity, titration for acid value and anhydride content, and spectrophotometry for color assessment. Method selection always follows customer or contract specification, with calibration and proficiency audited during annual internal quality reviews.
Feedstock decisions follow regional economics and reliability. Benzene and n-butane serve as principal raw materials, with n-butane favored for lower aromatic byproducts and ease of purification. Vendor qualification focuses on supply consistency and trace contaminant profile.
Oxidation routes are chosen based on plant design, local regulation, and utility costs. n-butane air oxidation is performed over vanadium-phosphorus oxide catalysts, requiring close monitoring of air-to-hydrocarbon ratio to limit coke formation and maintain catalyst bed integrity. Benzene routes, less favored due to environmental and regulatory challenges, persist in legacy facilities.
Internal process control features continuous monitoring for oxygen enrichment, temperature mapping within catalytic beds, and real-time gas analysis of effluent. Purification involves fractionation and stripping to isolate product from water and higher-boiling tars. Crushers and sieves downstream ensure uniform particle sizing, especially for solid product delivery. Losses from sublimation and fugitive emission get tracked for environmental reporting.
Each batch undergoes testing for purity, color, and principal impurities. Consistency is achieved through close control of process variables, targeted addition of scavengers or stabilizers, and effective air exclusion. Release decisions always follow documented internal QC criteria and are cross-referenced with specific customer or regulatory requirements upon shipping.
Maleic anhydride efficiently opens to form maleic acid upon hydrolysis. Esterification with glycols, alkanols, and diols forms the basis for unsaturated polyester resin production. Diels-Alder reactions open further modification routes, with product tailoring guided by grade requirements and impurity tolerances.
Reactor conditions and selection of catalyst depend on feedstock, end-product use, and plant legacy technology. Temperature, solvent, and pressure are tuned according to downstream process compatibility to minimize formation of color bodies and resinification products. Catalyst management and poisoning are production's chief concern on multi-month campaign runs.
Main derivatives include fumaric acid, 1,4-butanediol, and specialty chemicals for resins, coatings, and agricultural products. Downstream applications require careful control over residual anhydride, water load, and acid value. Our plant adjusts output slate seasonally according to customer demand cycles.
Product storage at controlled temperature is critical to avoid caking, hydrolysis, or discoloration. Avoiding humidity and water ingress takes precedence at all storage locations, supported by regular drum/tank inspections. Light exposure has limited impact, but temperature cycling and condensation events are flagged by internal auditing as contributing to degradation risk.
Standard container choices match product form: fiber drums with PE liners, mild steel tanks with anti-corrosive coatings, or road tankers equipped for steam tracing in cold climates. Compatibility with gaskets and valves is routinely checked to prevent leakage or reaction with elastomers.
Shelf life varies by grade and packaging. Color shift, clumping, and a vinegar-type odor provide primary indicators of hydrolysis or contamination in storage. Batches demonstrating out-of-spec attributes undergo reprocessing or off-spec disposal in line with plant protocols and environmental compliance.
Maleic anhydride falls under hazardous chemical regulations for corrosivity and sensitization. Specific GHS codes and pictograms are communicated on shipping documents and workplace signage in accordance with governing jurisdiction.
The product causes eye, skin, and respiratory tract irritation. Dust or fume exposure precipitates sensitization and occupational asthma if not handled in sealed systems with exhaust. Process engineers mandate use of local mechanical ventilation, PPE, and automated loading for all handling and transfer steps.
Acute toxicity values depend on exposure route. Inhalation at concentrations exceeding occupational limits leads to immediate symptoms; dermal contact causes rapid irritation. Sensitization risk dictates annual health monitoring for shop floor personnel.
Workplace exposure limits govern job rotation, personal protection selection, and frequency of atmospheric monitoring. Regular review of global consensus and national standards determines engineering controls and operational practices for plant personnel, with handling SOPs updated annually based on audit findings and incident reports.
Production capacity depends on the type of process and plant scale. As a direct manufacturer, output hinges on the choice between the n-butane oxidation route or benzene oxidation. Most new installations favor the n-butane process for efficiency and cleaner operation. Actual availability varies seasonally as maintenance schedules and feedstock reliability shift. Continuous operations are supported by automated process control, but batch output can fluctuate due to planned turnarounds or unexpected line adjustments. Plant location, logistics, and upstream supplier dependability create additional variables in consistent supply.
Lead time generally aligns with current plant loading and product inventory. For regular customers with established forecasts, shipments often draw from rolling stock, with lead time shaped by logistics or transportation constraints. New or specialty grades typically require advance order placement, reflecting job scheduling, raw material supply, and lab release verification. MOQ depends on packaging and shipping mode. Large-volume customers using bulk ISO tanks may source entire reactor runs, whereas palletized drums or bags involve lower quantities but longer accumulation cycles.
Packing is determined by grade, purity, and downstream application. Bulk customers often require ISO tanks or road tankers configured to MA's melting point and pressure requirements. For mid-scale, we offer steel drums with sealing features chosen to limit hydrolysis and agglomeration. Some customers handling smaller volumes prefer fiberboard drums or multi-layered bags for downstream blending or repacking. Each form dictates handling protocols to protect against moisture ingress and impurity pickup during transport.
Shipping terms base themselves on regional compliance, transit time tolerances, and customer-incoterm preferences. For long-distance exports, MA typically moves under DAP or CIF with marine containers, while domestic dispatch goes by truck or rail. Payment terms reflect credit risk, contract size, and customer relationship duration. LC at sight or advance TT applies to new trade partners, while open account terms are possible for credit-vetted, high-frequency clients.
Raw material costs for MA hinge on n-butane or benzene feedstock markets. N-butane offers higher yield and cleaner crude butane, lowering purification steps and total variable cost. Benzene route may attract additional surcharge for separation and effluent management. Feedstock market volatility directly translates into pricing, with both oil and gas spot prices impacting upstream cost structure. Energy consumption adds to the picture, especially with fluctuating electricity and process steam rates.
Major factors that shift MA price include crude oil and gas index changes, region-specific feedstock disruptions, process shutdowns (both planned and unplanned), and regulatory costs tied to emission or waste compliance. Unseasonal demand spikes for downstream resins or copolymers create short-term tightness. Competing demand for feedstock from other chemical chains—such as butadiene or phthalic anhydride—occasionally absorbs available production, shifting spot and contract prices for MA.
Grade and purity introduce core price differentials. Food-grade, high-purity, and electronic-grade specifications command significant premium over technical or standard grades due to the extra purification, tighter QA controls, and monitoring for trace metals or organics. Packaging with specialized liners, antistatic treatment, or compliance certification (e.g., for export to certain regions where REACH or TSCA applies) increases packaging and logistics cost, which directly feeds into end price differences.
Worldwide MA output tilts toward East Asia and evolving supply hubs in India and Southeast Asia, driven by low-cost feedstock and export-oriented investments. Demand channels include unsaturated polyester resin, additives, and high-performance plastics. End-market cycles in autos, construction, and coatings impact bulk demand swings. In North America and the EU, supply tightness sometimes appears in periods of strong downstream growth or regulatory-driven plant outages.
2026 price trend likely tracks global oil and natural gas benchmarks, regional regulatory changes, and investment in new capacity. Market consensus indicates moderate price fluctuation as new plants come online in Asia and the Middle East, but rapid downstream demand spikes or feedstock shocks could trigger brief surges. Long-term contracts will reference published index prices, with spot deals carrying supply risk and grade premium.
Forecasts reflect synthesis of published commodity price indices, plant capacity announcements, regional capacity utilizations, and forward-looking statements from integrated value chains. Internal price modeling incorporates energy curve risk, plant performance histories, and customer feedback on logistical reliability.
Recent years brought expansion announcements in India and capacity restraints in the EU due to stricter emissions policies. Disruptions such as the Red Sea shipping route tensions temporarily lifted global spot pricing, as alternative logistics routes increased freight costs. Some Asian producers opted for temporary cutbacks to stabilize margins amid feedstock surges.
Compliance pressure remains intense, especially for emission, effluent, and product safety. EU REACH updates and new US exposure rules for MA build new compliance costs into manufacturing economics, requiring review of plant-level environmental controls and downstream documentation. Customers in all major economies increasingly require audit access and transparent quality documentation.
Producers have re-invested in process monitoring, emission abatement, and physically segregated storage for high-purity grades. Control over feedstock contracts and diversification of logistics allow buffering against raw material and shipping disruptions. Internal quality systems now feature real-time release testing, and investments target digital traceability to meet customer and regulatory scrutiny.
At the production level, Maleic Anhydride grades are sorted based on the required downstream performance and impurity tolerance of each application segment. Operators manufacturing unsaturated polyester resin (UPR) demand steady reactivity and manageable acid value fluctuations; process impurities such as low-level organic acids, ash, or color bodies can trigger process upsets or shorten resin gel time. Specific grades tailored for UPR applications go through in-process controls focusing on color (APHA scale), trace metal screening, and minimized organic residue generation. Volatile content is also monitored to prevent unintended emissions during resin curing.
Lubricant additive producers selecting MA face very different challenges. Here, color stability, low moisture content, and minimal metal traces affect the performance during Costrell process or thermal-initiated chain extension reactions. For these users, grades labeled "additive-grade" or "lube-grade" typically target even higher purification with narrower upper limits on potassium, sodium, and iron, as metal-promoted decomposition impacts end performance. Critical steps involve additional distillation or liquid-phase refining during manufacture.
Food contact and pharmaceutical intermediate applications follow far stricter protocols. Regulatory compliance for these regions does not allow reliance on technical-grade material due to the potential for by-product carryover or higher residual catalysts from the oxidation process. Food-grade or pharma-oriented MA mandates both feedstock traceability (often C4-based feed with defined origin), multi-stage purification, and batch-released QC focusing on nitrosamine, polynuclear aromatics, and other persistent organics. These batches undergo tighter QA, including periodic third-party audits and trace impurity profiling.
Copolymerization and water-treatment applications, such as the manufacture of SMA resins or specialty dispersants, prioritize consistent maleic anhydride reactivity index, typically assured by monitoring molar yield versus input over the course of continuous operation. Grades for high-end copolymer applications must balance organic purity with physical handling parameters, such as particle size and flowability (flake versus molten options), due to implications for large-scale blending or automated dosing downstream.
| Application Field | Recommended MA Grade | Key Technical Parameters in Selection | Critical Control Points from Manufacturer |
|---|---|---|---|
| Unsaturated Polyester Resins (UPR) | UPR/Technical Grade | Color index, ash, organic acids, water content | In-process color, residue controls during quenching and flaking |
| Lubricant Additives | Additive/Lube Grade | Color, metals (Na, K, Fe), organic by-products | Multi-stage refining, batch traceability |
| Food & Pharma Intermediates | Food/Pharma Grade | Impurity spectrum, feedstock traceability, regulatory documentation | Certified feed control, advanced purification, 3rd-party release |
| Copolymerization, Dispersants | High Purity/Custom Grade | Molar reactivity, particle size, flowability, volatiles | Granulation or flake control, particle profile inspection |
Clarify the function of MA in your output, whether as a monomer, intermediate, or performance modifier. Each downstream process—resin, copolymer, functionalization—requires different impurity tolerances due to sensitivity during polymerization, esterification, or heat processing. Open dialogue with the manufacturer helps isolate the appropriate grade during process transfer or scale-up.
Most non-specialty applications accept technical-grade MA, but regulated categories, such as food-contact resins or APIs, oblige higher-level batch and supply chain documentation. Users must reference local or customer-imposed regulatory regimes (FDA, EU, GB standards), since technical compliance starts from precursor control and refinement route choice in our factory.
Purity constraints flow from both process efficiency and end-use safety. Grades differ in allowable metal contamination, ash, or trace organic by-product content. Excess organics risk adverse reactivity or product instability. Discuss detailed, project-specific impurity profiles with our technical team if tolerances are tight or if downstream conversion yields have proven sensitive in pilot stages.
Process-scale users often balance between batch-customized high-purity lots and standard bulk technical grades. Higher purity and extra refining entail extra processing costs. Large volume purchases permit streamlined production campaigns and may allow joint planning for customized grade release. Manufacturers prefer early alignment on volume forecast and budgeting to synchronize scheduling and optimize batch cycle yield.
Production runs at commercial scale often respond differently to raw material changes than lab experiments or pilot lines. Always validate a representative batch sample to confirm absence of process upsets or conversion loss. Batch consistency and outlier impurities depend on grade stability and lot management practices upstream. Retain a direct line to the manufacturer's quality team for feedback or trouble-shooting during field qualification.
Every shipment of maleic anhydride leaves the plant after final clearance from the technical quality team. The facility maintains third-party audited quality system certification. Certification coverage includes continuous process evaluation, raw material qualification traceability, and internal standards for batch-to-batch reproducibility. Documentation for each dispatch contains signed records of analytical results matching internal product grade criteria. Technical management continually reviews certificate scope for relevance to new application areas.
Not all industries accept a single release standard. For maleic anhydride intended for sensitive polymer, resin, or food-contact resin intermediates, technical staff coordinate with customer-side quality managers to define critical impurity markers. Additional analytical certificates—such as phthalic acid or fumaric acid by-product profiles—are available based on customer-requested or regulatory-enforced specification targets. Each lot is backed with origin records and intermediate test-point data on request, especially for high-purity grades.
Shipping documentation packets commonly include certificate of analysis, statement of origin, and specification match report. For customers operating in highly regulated markets, downstream safety data sheet harmonization is supported by document control teams. Documentation links to batch laboratory records, accessible as needed for regulatory inspection or quality system audit. Reports reflect process conditions, detected levels of residuals, moisture, and tested grade-dependent parameters. When customers request tailored testing, parallel lab results are archived and issued as technical addenda.
Maleic anhydride output depends on reactor line scheduling, feedstock logistics, and maintenance cycles. Production planners evaluate incoming orders with consideration for minimum run size, required product grade, and blend ratios if multi-feedstock runs are needed. For anchor customers, production blocks are reserved in advance, lowering the risk of allocation cuts during peak periods. For distributors or end-users with erratic quarterly forecasts, flexibility is offered via indexed spot allocation combined with rolling forecast agreements. Contractual safeguards allow switching between monthly standing orders and single-spot procurement, based on actual downstream demand volatility.
The core plant supply chain is structured to minimize single-point bottlenecks. Feedstock is dual-sourced where regional availability allows, and redundancy in critical reactors minimizes unplanned stoppage risk. Finished goods storage is managed by grade and age, supporting consistent physical and chemical properties over the committed delivery interval. Regular preventive maintenance schedules and investment in debottlenecking upgrades contribute to capability for rush orders within realistic process limits. Emergency response contingencies cover raw material delivery disruptions or unplanned outages.
Technical support fields sample requests for grade assessment. Standard protocol requires submission of application context, purity targets, and preferred test parameter ranges. Typical request volumes depend on downstream trial scale; prepacked samples are isolated following batch release and tracked separately from bulk stock. Documentation for samples matches that of larger shipments—analytical test reports, MSDS forms, and storage handling protocols accompany dispatch. Feedback from customer side application engineers is archived and used for iterative grade improvement.
Business cooperation does not adhere to a single procurement model. For established customers, contracts can specify a mix of fixed monthly baseline plus floating top-up volumes with pre-agreed formula pricing. Spot market buyers can access shorter lead times with real-time production schedule visibility, with premiums adjusted for required grade and specification stringency. For project-based or seasonal users, production can be scheduled in campaign mode to consolidate logistics and minimize grade changeover losses. All cooperation modes prioritize technical dialogue to ensure stock rotation aligns with downstream storage and handling requirements. Each mode is supported by a dedicated technical point-of-contact to bridge process-specific questions with commercial agreements.
Research in the Maleic Anhydride sector remains heavily focused on process optimization and impurity control. Commercial plants using either n-butane oxidation or benzene oxidation target improvements in catalyst life, process yield, and energy consumption. Each production route requires specific management of catalyst performance and reactor fouling. Grade-dependent impurities, especially for food additive or polymer intermediate applications, require tailored purification strategies. Technical teams evaluate feedstock quality, operating conditions, and post-reaction separation methods continuously, as even minor deviations in raw material or reaction environment significantly affect final MA quality profiles.
The growth of bio-based unsaturated polyester resins, lubricant additives, and water treatment chemicals drives demand for MA with specific purity and physical format requirements. New segments such as specialty copolymers, biodegradable plastics, and functionalities for advanced composites invite joint developments with downstream formulators. Different grades—prilled, molten, or refined—must meet end-use requirements, with the selection of delivery form and grade specification based on customer process integration needs. Demand for tailored grades is particularly strong where regulatory or environmental restrictions apply.
Key challenges arise from controlling vapor-phase oxidation exotherms, managing reactor fouling, and minimizing byproducts such as phthalic anhydride or maleic acid. Breakthroughs in low-pressure operation, enhanced selective catalysts, and modular plant designs are under scrutiny. Inline spectral analysis, advanced temperature profiling, and residue removal technology support both yield improvements and impurity suppression. For high-purity or food-contact applications, strict batch traceability and closed-system packaging have become critical.
Maleic Anhydride demand is set for steady growth in both established and emerging markets. Industrial development in Asia, parallel regulation-driven product phase-outs in Europe, and the push for lightweight automotive and renewable materials will all shape consumption volumes. The range of specification needs grows as customers diversify into performance resins, specialty surface modifiers, and green chemicals. Market players with flexible purification and packaging assets gain an edge in meeting rapid shifts in grade and format preferences. Strategic sourcing of feedstock and advances in process integration will continue to define margin stability and long-term supply reliability.
The next cycle of MA production technology will emphasize modularity, digital control, and improved catalytic lifetime. Developments in process intensification, rapid defect detection, and condition-based asset maintenance drive plant flexibility and minimize cycle downtime. Transition to lower-carbon feedstocks, closed-loop energy recovery, and onsite purification adaptation offer advantages in both compliance and operational cost. Manufacturers adopting digital twin and remote monitoring tools achieve more consistent grade uniformity and improve early fault detection during production campaigns.
Sustainability goals directly impact raw material selection—preference or mandates for renewable n-butane and routes from bio-derived precursors appear in some downstream sectors. Reducing effluent generation and valorizing byproducts such as fumaric acid or CO₂ are core to new plant designs. Life cycle analysis, cradle-to-gate carbon tracking, and waste heat utilization form part of the technical roadmap for most site expansions and upgrades.
Direct manufacturer consultation ensures application-driven grade selection and specification alignment. Technical support teams are experienced in correlating customer process parameters with optimal MA delivery format and impurity thresholds. Whether for unsaturated polyester, specialty additives, or agricultural actives, support is tailored to each production environment’s requirements. Teams provide both process guidance and troubleshooting, leveraging operational data and field experience.
Collaboration with customers involves joint evaluation of MA grade and process compatibility, including reaction yield, polymer properties, and finished product stability. Pilot-scale or plant trial support allows fine-tuning of dosing, solubility, and purity impacts. Manufacturers recommend handling, storage, and feed strategies that account for volatility, moisture sensitivity, and contamination risks, all based on the specific application environment. Optimization focus is application-specific, not one-size-fits-all.
The manufacturer’s after-sales support includes documentation tailored to delivered grade and batch, ongoing feedback channels for process adaptation, and rapid investigation response for any deviation. Long-term partnerships facilitate site audits, training on safe and effective handling, and joint reviews of new regulatory or specification changes. The release of each batch aligns with both customer-defined and manufacturer-internal quality control criteria. Teams maintain a robust system for root cause analysis and resolution, supporting customers through both routine operations and novel application challenges.
Producing maleic anhydride demands strict process control. Technology selection determines the purity and color index, both crucial for use in value-added downstream applications. With years operating oxidation units using n-butane feedstock, we have refined both reaction efficiency and product recovery. Our approach reduces process byproducts, resulting in high-purity flakes or briquettes with minimal discoloration and controlled phthalic anhydride content. Each production run undergoes monitored catalyst lifecycle management. Stable output minimizes batch-to-batch variation, supporting end users who require predictable process input.
Our maleic anhydride finds use in unsaturated polyester resin production, which serves sectors like construction panels, automotive bodywork, and marine components. Additive and copolymer markets for lubricants, surfactant intermediates, plasticizers, and water treatment agents depend on consistent reactivity rates and tight impurity profiles. Manufacturers working in alkyd resins, pesticides, and food acidulants also leverage our ability to hold ash, iron, and heavy metal figures below globally recognized thresholds. Unlike intermediaries, factory direct control assures that our material fits both standard and specialty application requirements in thermoset plastics, coatings, and adhesives.
Quality management covers both process parameters and final product inspection. Automated dosing systems, in-line gas analyzers, and routine performance audits help ensure reactive content and melting point specifications do not drift. Laboratory technicians monitor each lot for potential off-odor incidents and excess residual solvents. Physical form—whether flakes, molten, or compacted blocks—aligns with specific customer unloading capabilities. The policy of traceability extends from raw material receipt through packed shipment, assuring that any inquiry into delivery specifics can be traced to original process conditions and quality certificates issued per lot.
Packaging options include multi-walled paper bags, steel drums, or bulk containers, sealed with moisture barriers to prevent hydrolysis during storage and transport. Automated handling machinery removes human contamination risks and keeps cargo weights within contractual margins. Production planning links with inventory management, so large or custom orders are shipped from stock to avoid procurement downtime. Dockside loading services support bulk exports. Each shipment aligns with regulatory and hazard communication standards demanded by international industrial buyers.
Downtime or batch rejection disrupts operations for manufacturers and processors. Technical engineers familiar with polyester resin and chemical synthesis routes work with clients directly to interpret analytical data, advise on process adjustments, or resolve handling queries. The ability to track reported issues to a defined production date allows proactive improvement of process variables. Specifications often change as downstream industries evolve, so direct technical discussions help buyers extract maximum process yield and minimize off-grade generation without extended turnaround periods.
Direct producers offer a transparent picture of material availability, competitive logistics, and quality risk management. For manufacturers, certainty in product characteristics supports stable output and facilitates regulatory compliance. Distributors manage reduced inventory risk and can assure their industrial clients of consistent input quality. Procurement teams auditing suppliers benefit from direct traceability and real-time access to technical and quality information traced to a single point of production. The ability to coordinate commercial terms, packaging requirements, and delivery timing with the manufacturing source reduces miscommunication and administrative overhead for long-term business partners.
Our production of maleic anhydride starts with premium feedstock and controlled oxidation technology, delivering a product with reliable quality for both chemical and physical properties. These properties are not just technical details—they drive performance in countless applications from resins to specialty polymers. Our plant teams have followed the way these properties affect real-world processing and long-term results for decades.
Maleic anhydride stands out for its strong reactivity. Its double bond and anhydride groups allow clean, predictable insertion into many chemical reactions. In the manufacture of unsaturated polyester resins, for instance, this reactivity ensures consistent curing rates and mechanical strength in the final plastic. Our experience shows that even small deviations in purity or reactive group concentration will affect polymerization behavior, especially in high-output lines. That makes controlling purity—on the order of parts per million impurities—central to our production.
We supply maleic anhydride as white to faintly off-white flakes or briquettes. Handling properties matter in busy plants. Our flake forms break up easily for automated dosing, while briquettes minimize dust and loss during transfer. Customers using continuous reactors value fast, predictable melting—so we target a narrow melting point range near 52 to 56°C. Moisture pick-up leads to hydrolysis and off-spec performance in downstream applications, so we operate low-humidity packing rooms and sealed storage tanks for transfer. Experience has shown that a dry, free-flowing product keeps extrusion and blending equipment running smoothly.
Maleic anhydride produces a pungent, irritating odor at relatively low concentrations. This trait gives an early warning of accidental releases. Our operators install and maintain local exhaust in truck loading bays and drum filling stations for that reason. Volatility rises sharply above the melting point, so controlling storage temperatures below 40°C helps prevent vapor buildup. Our technical teams have seen how even minor leaks, if left unchecked, produce rapid corrosion of mild steel piping and discomfort among plant technicians. Stainless steel or lined systems extend equipment lifespan and reduce service calls.
Many industrial uses rely on maleic anhydride’s solubility in organic solvents and partial solubility in water. This property supports quick mixing with glycols and alcohols in resin preparation lines. Teams in film and coating plants benefit from the absence of undissolved particles, leading to clear, defect-free finishes. In agricultural formulations, even dispersion prevents nozzle blockages and uneven application rates in the field.
Maleic anhydride resists oxidation and polymerization in solid form under ambient conditions. Long-term storage studies at our site confirm that controlling exposure to air and water vapor prolongs shelf life well beyond twelve months. Drums and sacks remain sealed until batch charge to prevent clumping and hydrolysis. We guide industrial users on rotating stocks and checking packaging integrity, especially in high-humidity climates, because uncontrolled hydrolysis generates maleic acid and cuts product value for sensitive syntheses.
As direct manufacturers, we follow the link between these properties and operational results at customer sites. Close attention to reactivity, purity, form, safety, and stability sets the foundation for efficient, predictable, and cost-effective processing in every application. Our technical team provides support and detailed documentation to match project needs and maximize end-use value.
Practical questions come up every day in the maleic anhydride business, but MOQ and lead time stand out constantly. Our team tackles these topics directly, since they shape production planning and customer reliability just as much as raw material prices or energy costs.
Minimum order quantity starts with the realities of batching and containerization. In an operation running continuous oxidation of butane or benzene, line changeovers are time-consuming and carry risk for off-spec product. To prevent waste and manage logistical efficiency, our MOQ for maleic anhydride often begins at one full pallet. That’s about a metric tonne in solid flakes, or cases where liquid delivery is standard, one ISO tank per order. Both approaches keep material handling safe and shipping economics reasonable.
Buying under our MOQ rarely lines up with bulk chemical economics: expensive to clean tanks and pack out a half-load. Batch-based processes, while flexible, do not justify splitting runs for small orders outside our regular client programs. That’s not us being rigid; it is respecting both factory sustainability and customer value—no one likes to pay the hidden cost of half-empty drums or higher freight per kilo. Our aim always points toward operational transparency: we lay out these quantities up front in our quotations, keeping all expectations clear at the beginning.
Lead time for maleic anhydride is built from two factors—our raw material feedstock schedule, and real-world production backlog. We keep ample feedstock on-site and maintain a buffer stock of finished product, but seasonal surges in demand or unplanned maintenance on a reactor can change the picture. Under stable conditions, we commit to seven to ten days for routine shipments from our primary site. Direct export orders may tack on customs clearance and freight booking, but our logistical department makes these variables transparent during contract negotiation.
During periods of tight supply—turnaround season, spike in unscheduled demand, or feedstock price shocks—lead time stretches to match reality. We deliver honest information based on our monthly production plan and available inventory. If a partner needs a forecast or reserve batch, we build it into our planning window. There’s no value to over-promising; speculation leads to broken trust, both for us and for clients.
We see procurement as a partnership. Buyers with predictable consumption gain the most from block scheduling their shipments; our system rewards regularity by prioritizing on-time delivery and securing filled production slots. Those facing market volatility or new product launches often need flexibility, so our business development team works out tailored rolling forecasts or split-shipment approaches where possible.
Our team reviews every MOQ and lead time commitment as part of sales contract review. We address market shifts fast, never claiming certainty where none exists, and combining plant scheduling experience with a frank review of what’s feasible for both sides. By owning the production process end-to-end, from feedstock procurement to quality testing and loading at the plant gate, we provide reliable industrial supply rooted in the realities of manufacturing—not just commercial aspiration.
Maleic anhydride doesn’t leave room for shortcuts, whether transporting ton tanks across highways or stacking 25-kilogram bags in a climate-controlled warehouse. As manufacturers with decades of experience moving, packing, and storing this substance, we see firsthand that it rarely forgives complacency. Regulatory compliance doesn’t just sit on paper—it keeps cargo moving legally and people safe.
We ship maleic anhydride in molten and solid forms, and both formats trigger significant oversight. Internationally, it counts as a hazardous material under regulations such as ADR in Europe, DOT in the United States, and under various IMDG rules for seaborne shipments. Each transport unit gets labeled with UN number 2215, and hazard identification follows the requirements for Class 8 corrosive substances. Our shipping documentation always includes a safety data sheet (SDS), as well as any certificates showing current batch quality and purity. This ensures every transporter and customs authority knows what’s on board.
On the road, truck and rail safety laws set strict rules for hazardous containment. For molten product, we use insulated ISO tanks with venting capability and heating options, checked before every fill. We monitor seal integrity and tank cleanliness. Solid maleic anhydride goes out in lined bags and steel drums, stacked to avoid puncture, with each consignment matched to a shipping manifest identifying gross weight, batch number, and destination.
Storing maleic anhydride at scale presents its own challenges. What regulators write into law, we implement on the warehouse floor every day. This product reacts strongly with water. Any trace of humidity turns it to maleic acid and can cause caking or dangerous fumes. Our storage areas maintain low humidity, dust control, and excellent ventilation. Fire protection goes beyond standard sprinkler heads; dry powder extinguishers line every entrance. We install floor bunding to contain leaks and rely on air monitoring for possible fume releases.
Only trained staff move or open containers, wearing full PPE, with a clear procedure for spill management. If something goes wrong, local emergency services get documentation on chemical hazards ahead of time, and our SDSs sit with them for reference.
Every outgoing shipment leaves our factory with a documentation set: bill of lading, up-to-date SDS, packaging certificates, and—where required—letters of analysis from the production batch. We often find customs and regulatory agencies want proof of compliance with REACH (in Europe) or TSCA (in the USA); our compliance office maintains these dossiers and updates relevant registrations for every market we serve.
Global movement of maleic anhydride often demands special licenses or notification filings, especially for bulk containers crossing certain borders. We keep records for all such paperwork and update our procedures regularly—the alternative means shipment delays or regulatory fines.
Regulation on hazardous materials grows more complex each year, and we update in-house protocols every time the law changes. Our technical team keeps up with transportation developments and revises packaging standards to meet evolving requirements. In our view, strict compliance with these controls forms the backbone of reliable, problem-free delivery and storage. Safe handling protects our people, customers, and the communities where we operate.
For product inquiries, sample requests, quotations or after-sales support, please feel free to contact me directly via sales3@ascent-chem.com, +8615365186327 or WhatsApp: +8615365186327
