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Maleic anhydride, also known as maleic anhydride, maleic anhydride, 2,5-furandione, and the like. Orthorhombic crystals are colorless needles or plate crystals. Strongly pungent odor, soluble in ethanol, ether and acetone, insoluble in petroleum ether and carbon tetrachloride.
Appearance: white flaky crystals, powdery, needle-like, flake-like, pellet-like, rod-like, clump-like or molten substance, with a strong pungent odor
Relative density: 1.480
Melting point: 52.8°C
Boiling point: 202.2°C
Flash point (open cup): 110.0°C
It is easier to vaporize at lower temperature (60-80°C), soluble in alcohol, ether and acetone, easily deliquescent with water to produce maleic acid.
Used as a raw material for the production of 1,4-butanediol, tetrahydrofuran, succinic acid, unsaturated polyester resins, alkyd resins, etc. Also used for medicine and pesticides, in the production of pesticides for the synthesis of organophosphorus pesticides Mara Phosphorus intermediates diethyl diethyl maleate, pyridazine intermediate 1-phenyl-3,6-dihydroxypyridazine, and pyrethroid insecticides, tetramethrin, fungicides, grams The intermediates of bacillus are also used in the production of unsaturated polyester resins, ink auxiliaries, papermaking auxiliaries, coatings, as well as pharmaceutical and food industries. It is also a coating, maleic rosin, polymaleic anhydride, maleic anhydride-styrene copolymer. Is also the production of ink additives, paper additives, plasticizers and tartaric acid, fumaric acid, and other organic chemical raw materials. Also used for organic synthesis, also used as synthetic fiber intermediates.
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