Learn about the properties and uses of maleic acid in one article

[Alias]Maleic acid, anhydrous malic acid, cisonic acid.

［Molecular Formula］C4H4O4

［Structural Formula］HOOCCH–CHCOOH

[Properties]Maleic acid is a white monoclinic prismatic crystal, the industrial product is slightly yellow and has a slightly astringent taste. . The relative density is 1.590 (20℃), the melting point is 130-131℃, and it decomposes at 138℃. Soluble in water, ethanol, ether and acetone, etc., slightly soluble in benzene. It easily loses water when heated to form maleic anhydride. It has active chemical properties and can carry out reactions such as addition, self-polymerization, copolymerization, acylation, amidation, halogenation, hydrogenation, hydration, alkylation, decarboxylation and isomerization.

[Use]Organic synthetic raw materials are used to make tartaric acid, succinic acid and unsaturated resins, and are used to make malathion, Raw materials for clothing medicines such as maleic acid hydrazide, captan, captafant, and fentanyl. It is also used in the manufacture of coatings, dye additives, fluorescent whitening agents, plasticizers, lubricating oil pour point depressants, paper treatment agents and water quality stabilizers, etc. It is also used as a preservative for oils and greases.

[Brief preparation method]

① Using benzene as raw material, maleic anhydride is produced by air oxidation under the action of vanadium catalyst, and then maleic anhydride is obtained after water absorption, crystallization and drying. enedioic acid.

② Use butene or butane as raw material, first produce maleic anhydride through air hydrogenation under the action of vanadium catalyst, and then absorb, concentrate and dry it with water. Preparation of maleic acid.

③ Using naphthalene as raw material, when oxidizing phthalic anhydride, the by-product maleic anhydride is obtained, which is then obtained by water absorption, crystallization and drying. Maleic acid.

[Safety and Protection]Packed in woven bags lined with plastic bags, net weight 25kg. Store in a cool, dry place.

This product is toxic. Skin contact with liquid acid can cause burns, and splashing into the eyes can cause conjunctivitis. In severe cases, it can cause vision loss or even blindness. After skin contact, rinse with plenty of water.