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順酐，又稱順丁烯二酸酐，馬來酸酐，2,5-呋喃二酮等。斜方晶系無色針狀或片狀晶體。有強烈刺激氣味，溶于乙醇、乙醚和丙酮，難溶于石油醚和四氯化碳。與熱水作用而成馬來酸。

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.

主要用于不飽和聚酯樹脂、醇酸樹脂、農藥馬拉硫磷、低毒農藥4049、長效碘胺的原料。也是涂料、馬來松香、聚馬來酐、順酐-苯乙烯共聚物的共聚單體，也是油墨助劑、造紙助劑、增塑劑、酒石酸、富馬酸、四氫呋喃等的有機化工原料。

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.

丁烯二酸酐又名順酐、馬來酐、失水蘋果酸酐，是一種重要的不飽和有機酸酐基本原料，在農藥上用于合成有機磷殺蟲劑馬拉硫磷的中間體順丁烯二酸二乙酯、噠嗪硫磷的中間體1-苯基-3，6-二羥基噠嗪，以及擬除蟲菊酯殺蟲劑胺菊酯、劑、克菌丹的中間體，此外，還用于不飽和聚酯樹脂、油墨助劑、造紙助劑、涂料以及醫藥工業、食品工業等。

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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