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Maleic anhydride is an organic compound with the formula C2H2(CO)2O. It is the acid anhydride of maleic acid. It is a colorless or white solid with an acrid odor. It is produced industrially on a large scale for applications in coatings and polymers.
Maleic anhydride is produced by vapor-phase oxidation of n-butane. The overall process converts the methyl groups to carboxylate and dehydrogenates the backbone. The selectivity of the process reflects the robustness of maleic anhydride, with its conjugated double-bond system. Traditionally maleic anhydride was produced by the oxidation of benzene or other aromatic compounds. As of 2006, only a few smaller plants continue to use benzene.
In both cases, benzene and butane are fed into a stream of hot air, and the mixture is passed through a catalyst bed at high temperature. The ratio of air to hydrocarbon is controlled to prevent the mixture from igniting. Vanadium pentoxide and molybdenum trioxide are the catalysts used for the benzene route, whereas vanadium phosphate is used for the butane route:
C4H10 + 3.5 O2 → C4H2O3 + 4 H2O H = −1236 kJ/mol
The main competing process entails full combustion of the butane, a conversion that is twice as exothermic as the partial oxidation.
The traditional method using benzene became uneconomical due to the high and still rising benzene prices and by complying with the regulations of benzene emissions. In addition, in the production of maleic anhydride (4 C-atoms) a third of the original carbon atoms is lost as carbon dioxide when using benzene (6 carbon atoms). The modern catalytic processes start from a 4-carbon molecule and only attaches oxygen and removes water; the 4-C-base body of the molecule remains intact. Overall, the newer method is therefore more material efficient.
| Item | Standard |
| Product Name | MA ,Maleic Anhydride,2, 5-Furandine,Cis-Butenedioic Anhydrides |
| Content (w, %) | ≥99% |
| CAS NO | 108-31-6 |
| EINECS No. | 203-571-6 |
| Appearance | White flake active granular crystal |
| Melting chroma / Hazen unit | ≤25 |
| Crystallization point / ºC | ≥52.5 |
| Mass fraction of burning residue /% | ≤0.005 |
| Mass fraction of iron (calculated by FE)/( μ g/g) | ≤3 |
| Molecular Formula | C4H2O3 |
| Application | Coating Auxiliary Agents, Leather Auxiliary Agents etc. |
1.It is mainly used to produce unsaturated polyester resin, alkyd resin, pesticide malathion, high
efficiency and low toxicity pesticide 4049 and long-acting iodamine. It is also a coating, maleic rosin, polymaleic anhydride, maleic anhydride styrene copolymer. It is also an organic chemical raw material for the production of ink additives, papermaking additives, plasticizers, tartaric acid, fumaric acid, tetrahydrofuran, etc. It can be used as curing agent of epoxy resin, and can be used to manufacture succinic acid, succinic anhydride, etc. in organic synthesis. It is used in the pharmaceutical industry to manufacture long-acting sulfonamides and other drugs. In the food
industry, it is used to manufacture sour agents, such as malic acid and tartaric acid.
2.Used in organic synthesis, synthetic fiber intermediate. Used as an analytical reagent, such as
a reagent for the determination of organic compounds with conjugated double bonds.
3.It can be used as curing agent for epoxy resin. The reference dosage is 19 ~ 27 parts by mass.
It is not suitable to be used alone because of its high reactivity and volatility. It is mostly mixed with other anhydride or toughening agent (such as pyromellitic dianhydride). Curing conditions:160 ~ 200 ºC / (2 ~ 4h). It can also be used to graft with EVA and PE blends to prepare new polymers of hot melt adhesive and improve adhesion. It can also be used as a modified monomer for the production of acrylate emulsion and grafting with SBS.
Shandong Near Chemical Co.,Ltd is located in the beautiful Yellow River Delta, the mouth of the Yellow River into the sea-Dongying City. With a registered capital of 30 million yuan, it was founded in 2011 and has grown rapidly with total assets 180 million yuan and 100 employees. Near Chemical is a comprehensive service company focusing on import & export of chemicals and domestic trade. We are integrating rich chemical resources along with individual customized services for all global clients.
Our company adheres to the market-oriented, committing to exploring the diversified international market, as well as the principle of honesty and trustworthiness. The clients of Near Chemical always come first.
In the past decade, Near Chemical has established a stable and friendly partnership with thousands of customers over 60 countries and regions. We have spread wide range of chemicals in various fields such as pharmacy, petroleum, animal husbandry, food processing, printing&dyeing, manufacturing industries etc. Near Chemical now has warehousing, trading, public utilities ,property management and other comprehensive entities, and gradually develop to collectivization, internationalization and Industrialization. Our company has a good development prospect and unlimited potential future.
Our main production lines are including Methylene Chloride 30,000 tons/year, Maleic Anhydride 30,000 tons/year, Propylene Glycol 20,000 tons/year.
Meanwhile, we specialized in offering the following chemicals: Aniline,Dimethyl Formamide,Isopropanol ,Toluene diisocyanate,Polyether Polyol,Polymer Polyol, Methyl Acetate, Ethyl Acetate, Butyl Acetate, Glacial Acetic Acid, Potassium Hydroxide, Nitrile Butadiene Rubber Latex, Caustic Soda, Dipropylene Glycol, Ethylene Glycol, Phenol, Phthalic Anhydride, Cyclohexanone, Thiourea, Barium Carbonate, Aluminum Chloride, Calcium Nitrate, N-propanol, Methyl Ethyl Ketone, Methanol, Ethanol, Cyclohexane, Dimethyl Carbonate, Dichlorodifluoromethane, Dichlorofluoromethane, Trichloroethylene, Tetrachloroethylene, Epichlorohydrin, Sodium Hydroxide Liquid, etc.
We always carry out "quality first and service the best".
Near Chemical, Near U, Warm the world.
Our Advantage
10 Years Experiences
Our products have been promoted to all over Europe,North&South America, Middle-east, Asia and pacific area as well as Africa,we have established long term cooperation with our clients.
Quality service
Adhering to the principle of "quality first,service the best" Near Chem insists on providing high quality chemicals based on a complete Quality Assurance System. Meanwhile,we use SOP system to guarantee our whole logistics. Near Chem has built a mutual trust under honesty and integrity principles with customers all around the world.And will keep promoting our commitment to better a nearer Chem to the world.
24 hour service
24 hours quick and clear respond to our customers all around the world. Professional and individual after sales service to assure the Customer satisfaction.
FAQ
1 Q:Are you manufacturer?
A: As an integrated enterprise, we have our own production lines on Methylene Chloride, Chloroform and Aniline oil, meanwhile we are one of the experienced distributors for other chemicals such as cyclohexanone, Dimethyl Formamide, Propylene Glycol, Ethylene Glycol, Dimethyl Carbonate, Thiourea, Polyol, TDI, IPA, Ethanol etc. We have competitive price benefited by ready stock and good relations with some leading chemical manufacturers.
2 Q: How can you guarantee your quality?
A: Our factory owns mature production line under EPR quality system. We can guarantee the stability and qualification of the raw materials. And we also have SOP loading system to ensure the safety and timely transportation.
3 Q: Can I get some samples?
A: Yes, we welcome sample order for you to test and check our quality. Send me your requirements of the product you need. We can provide sample free of charge, and the express cost is on you.
4 Q: How to confirm the Product Quality before placing orders?
A : You can get free samples from us or taking our previous SGS Reports as reference or arrange SGS before loading.
5 Q: What is your MOQ?
A: Our MOQ is 20'FCL for each product.
6 Q: What kind of package do you have?
A: We have various of packages to meet needs of our customers,like Iron drums,plastic drums, IBC tanks, Flexitank, ISO TANK and bags etc.
7 Q :Which kind of payment terms do you accept?
A:We prefer TT, LC payment terms. Other payment terms are flexible to be further discussed.
8 Q:Can you give me a discount price?
A: Yes. It depends on your order qty.
9 Q: How about your delivery? How long is your delivery time?
A: Prompt and reliable delivery by professional shipping lines.
Generally it takes 14 days after deposit or original LC.
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