顺酐，又称顺丁烯二酸酐，马来酸酐，2,5-呋喃二酮等。斜方晶系无色针状或片状晶体。有强烈刺激气味，溶于乙醇、乙醚和丙酮，难溶于石油醚和四氯化碳。与热水作用而成马来酸。

Maleic anhydride, also known as maleic anhydride, maleic anhydride, 2,5-furandione, etc. The rhombic crystal system is a colorless needle shaped or sheet-like crystal. Has a strong pungent odor, soluble in ethanol, ether, and acetone, but insoluble in petroleum ether and carbon tetrachloride. It reacts with hot water to form maleic acid.

主要用于不饱和聚酯树脂、醇酸树脂、农药马拉硫磷、低毒农药4049、长效碘胺的原料。也是涂料、马来松香、聚马来酐、顺酐-苯乙烯共聚物的共聚单体，也是油墨助剂、造纸助剂、增塑剂、酒石酸、富马酸、四氢呋喃等的有机化工原料。

Mainly used as raw materials for the production of unsaturated polyester resin, alkyd resin, pesticide malathion, high-efficiency and low toxicity pesticide 4049, and long-acting iodamine. It is also a comonomer of coatings, maleic rosin, polymaleic anhydride, and maleic anhydride styrene copolymers. It is also an organic chemical raw material for the production of ink additives, papermaking additives, plasticizers, tartaric acid, fumaric acid, tetrahydrofuran, and other chemicals.

丁烯二酸酐又名顺酐、马来酐、失水苹果酸酐，是一种重要的不饱和有机酸酐基本原料，在农药上用于合成有机磷杀虫剂马拉硫磷的中间体顺丁烯二酸二乙酯、哒嗪硫磷的中间体1-苯基-3，6-二羟基哒嗪，以及拟除虫菊酯杀虫剂胺菊酯、剂、克菌丹的中间体，此外，还用于不饱和聚酯树脂、油墨助剂、造纸助剂、涂料以及医药工业、食品工业等。

Maleic anhydride, also known as maleic anhydride, maleic anhydride, or dehydrated malic anhydride, is an important basic raw material for unsaturated organic anhydrides. It is used in pesticide production to synthesize the intermediate of organic phosphorus insecticide malathion, diethyl maleic acid, 1-phenyl-3,6-dihydroxypyridazine, as well as the intermediate of pyrethroid insecticide amithroid, fungicide, and chloramphenicol. In addition, it is also used in the production of unsaturated polyester resin Ink additives, paper additives, coatings, as well as pharmaceutical and food industries.

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