Maleic anhydride, also known as maleic anhydride or dehydrated malic anhydride, is often referred to as maleic anhydride. Colorless crystal with strong pungent smell. At room temperature, it is white, granular, needle like, sheet-shaped, rod-shaped, blocky or lump like, with strong irritation.

相对密度1.48，熔点52.8℃，沸点202.2℃，在较低温度下(60-80℃)也能升华，能溶于醇、乙醚和丙酮，与水作用生成顺丁烯二酸。可燃、其蒸汽和粉尘与空气混合，可形成爆炸混合物。

The relative density is 1.48, the melting point is 52.8 ℃, and the boiling point is 202.2 ℃. It can also be sublimated at a lower temperature (60-80 ℃). It can dissolve in alcohol, ether and acetone, and react with water to form maleic acid. Combustible, its steam and dust mixed with air, can form explosive mixture.

主要由苯或碳四馏分中的正丁烷或丁烯氧化而制得，是不饱和聚酯及有机合成的原料。

It is mainly prepared by oxidation of n-butane or butene in benzene or C4 fraction. It is a raw material for the production of unsaturated polyester and organic synthesis.

制造聚酯树脂、醇酸树脂、农药、富马酸、纸张处理剂等。顺酐是重要的有机化工中间体，可用于制作塑料工业中的增塑剂；造纸业中的纸张处理剂；合成树脂产业中的不饱和聚脂树脂；涂料业中的醇酸型涂料；农药中的马拉硫磷的合成；医药产业中磺胺药品的等。

Manufacture polyester resin, alkyd resin, pesticide, fumaric acid, paper treatment agent and so on. Maleic anhydride is an important organic chemical intermediate, which can be used to make plasticizer in plastic industry, paper treatment agent in paper industry, unsaturated polyester resin in synthetic resin industry, alkyd coating in coating industry, malathion synthesis in pesticide production, sulfonamide drug production in pharmaceutical industry, etc.

近年来以其为主要原材料的丁二酸、酒石酸产业迅速扩大，其在工程建筑、食品调味剂、生物拆分剂等领域的应用得以不断扩大。以顺酐为原料的下游衍生物如1，4-丁二醇、四氢呋喃、γ丁内脂等亦有很大的发展

In recent years, the industry of succinic acid and tartaric acid, whose main raw materials are succinic acid and tartaric acid, has been expanded rapidly, and its application in engineering construction, food flavoring agent, biological resolution agent and other fields has been continuously expanded. The downstream derivatives of maleic anhydride such as 1,4-butanediol, tetrahydrofuran, γ - butyrolactone, etc