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Uses and synthesis of Maleic anhydride powder

Maleic anhydride powder, abbreviated as maleic anhydride, also known as "maleic anhydride", is the acid anhydride of maleic acid. Maleic anhydride CAS 108-31-6 is a colorless or white solid with acidic smell at room temperature, molecular formula C4H2O3, molecular weight 98.06, obtained from chloroform or ethyl ether as needle-like crystals. Melting point 60 ℃, boiling point 82 ℃ (1.8665kPa), relative density 1.31460. soluble in acetone, chloroform, ether, slightly soluble in petroleum ether. Maleic anhydride Raw Materials dissolved in water to generate cis-butenedioic acid, dissolved in alcohol to form esters, Maleic anhydride Raw Materials can be combined with a conjugated double bond. Maleic anhydride powder is toxic and strongly irritates mucous membranes.

Applications / Functions of Maleic anhydride powder

1. Maleic anhydride CAS 108-31-6 Used as a raw material for the production of 1,4-butanediol, γ-butyrolactone, tetrahydrofuran, succinic acid, unsaturated polyester resins, alkyd resins, etc. It is also used in medicine and pesticides.
2. Maleic anhydride powder, also known as maleic anhydride, maleic anhydride, malic anhydride, Maleic anhydride powder is an important unsaturated organic anhydride basic raw materials, in the production of pesticides used for the synthesis of organophosphorus insecticide malathion intermediate diethyl maleic dibenzoate, pyridazinethiophos intermediates 1-phenyl-3,6-dihydroxypyridazine, as well as pyrethroid insecticides, pyrethroid, aminopyralid In addition, Maleic anhydride Raw Materials are also used in the production of unsaturated polyester resins, ink auxiliaries, paper auxiliaries, coatings, as well as in the pharmaceutical industry, food industry and so on.
3. Maleic anhydride CAS 108-31-6 is mainly used in the production of unsaturated polyester resin, alkyd resin, pesticide malathion, high-efficiency and low-toxicity pesticide 4049, the raw material of long-lasting iodine. It is also the raw material for coating, maleic rosin, polymaleic anhydride, maleic anhydride-styrene copolymer.Maleic anhydride powder is also the raw material for the production of ink auxiliaries, papermaking auxiliaries, plasticizers, and organic chemicals such as tartaric acid, fumaric acid, tetrahydrofuran, and so on.
4. Maleic anhydride raw materials for organic synthesis, also used as synthetic fiber intermediates
5. Maleic anhydride powder is used as a trapping agent in metal beneficiation.

Physicochemical Property of Maleic anhydride powder

Maleic anhydride powder can undergo the following reactions: hydrolysis to produce maleic acid (cis-HO2CCH=CHCO2H), 1:1 alcoholysis to produce the monoester: cis-HO2CCH=CHCO2CH3; used as a pro-dienophile in the Diels-Alder reaction; coordination with low-valent metals, examples of complexes such as Pt(PPh3)2 (MA) and Fe(CO)4(MA).Maleic anhydride Raw Materials undergo photochemical dimerization reactions to form CBDA.

Colorless acicular or lamellar crystals of the rhombohedral crystal system.Maleic anhydride CAS 108-31-6 dissolves in water to form maleic acid. Soluble in ethanol and form ester.

production methodprocess of Maleic anhydride powder

Benzene is mixed with air (benzene is 1%-1.4%) through the heat exchanger preheating, into the tube catalytic reactor. The oxidation reaction is carried out under the reaction conditions of 0.1-0.2MPa pressure and 350-400℃, and the obtained product is cooled to close to the dew point (55-65℃) by two heat exchangers and one cooler. The cooled reaction product enters the separator, and the crude maleic anhydride is obtained at the bottom of the separator and enters the crude maleic anhydride tank. The effluent from the top of the separator enters the scrubber tower and is washed with water. At the top of the tower is excess air and unreacted benzene, which can be recovered by adsorption. The water solution at the bottom of the scrubber tower enters the dehydrator, separates out the water, and the crude maleic anhydride enters the crude maleic anhydride tank, and further enters the distillation tower for distillation and refining, and Maleic anhydride CAS 108-31-6 is obtained.

The main production methods of maleic anhydride are benzene oxidation, butene oxidation and n-butane oxidation, but benzene oxidation is still the main method.

• 1. Benzene oxidation method benzene in the V-Mo-P system catalyst, oxidation reaction in a fixed bed, generating maleic anhydride, the reaction temperature of 365 ℃ (reaction bed can also be used in the boiling bed, but the consumption is high). Then water absorption to generate maleic acid, and then azeotropic dehydration and distillation, scraping to get Maleic anhydride powder.
• 2. Butane (or butene) oxidation method Butane (or butene) in the V-Mo catalyst, air or oxygen oxidation to generate maleic anhydride, the reaction temperature of 350-400 ℃. Then it is absorbed by water, dehydrated and refined to get Maleic anhydride powder.

The synthesis methods of maleic anhydride mainly include benzene oxidation, butene oxidation, butane oxidation, etc. At present, most of the production adopts benzene oxidation, that is to say, benzene is used as raw material, and maleic anhydride is obtained by catalytic oxidation. Fixed-bed or boiling-bed reactor is used to oxidize benzene to maleic anhydride with air under the action of V-Mo-P system catalyst, and the reaction temperature is 365°C. Then water is absorbed to produce maleic anhydride. Then aqueous maleic acid solution was generated by water absorption, and then maleic anhydride was obtained by azeotropic distillation and dehydration with xylene, and finally Maleic anhydride Raw Materials were obtained by decompression distillation.

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