顺丁烯二酸酐又名马来酸酐或失水苹果酸酐，常简称顺酐。无色正交针状结晶或白色结晶性粉末，有强烈刺激气味，凝固点52.8℃，沸点202℃，易升华。溶于水、丙酮、苯、氯仿等多数有机溶剂。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。

Maleic anhydride, also known as maleic anhydride or dehydrated malic anhydride, is commonly referred to as maleic anhydride. Colorless orthogonal needle shaped crystalline or white crystalline powder, with a strong pungent odor, a freezing point of 52.8 ℃, a boiling point of 202 ℃, and easy sublimation. Soluble in most organic solvents such as water, acetone, benzene, chloroform, etc. Mainly produced by the oxidation of n-butane or butene in benzene or C4 fractions, it is a raw material for the production of unsaturated polyester and organic synthesis.

顺丁烯二酸酐在25℃时在下列溶剂中的溶解度( gllOOg)：丙酮227，乙酸乙酯112，氯仿52.5 I苯50 I甲苯23.4；邻二甲苯19.4；四氯化碳0. 60；石油醚0.25。溶于醇生成酯。溶于二氧六环。受热升华。遇高热、明火或与氧化剂接触，有引起燃烧的危险。有腐蚀性。在冷水中缓慢水解，生成马来酸。与强氧化剂接触能引起燃烧和爆炸。若温度超过66℃、与胺类或碱金属接触会发生聚合反应。

The solubility (gllOOg) of maleic anhydride in the following solvents at 25 ℃: acetone 227, ethyl acetate 112, chloroform 52.5 I benzene 50 I toluene 23.4; Ortho xylene 19.4; Carbon tetrachloride 0.60; Petroleum ether 0.25. Dissolve in alcohol to form esters. Dissolved in dioxane. Heat sublimation. There is a risk of combustion when exposed to high heat, open flames, or contact with oxidants. It is corrosive. Slowly hydrolyze in cold water to produce maleic acid. Contact with strong oxidants can cause combustion and explosion. If the temperature exceeds 66 ℃ and comes into contact with amines or alkali metals, polymerization reactions will occur.

鉴别:顺丁烯二酸酐又名马来酸酐，主要又苯或碳四馏分中的正丁烷或丁烯氧化而制得，是不饱和聚酯以及有机合成原料。顺丁烯二酸酐用于鉴别共轭二烯反应生成环状化合物。

Identification: Maleic anhydride, also known as maleic anhydride, is mainly produced by the oxidation of n-butane or butene in benzene or C4 fractions. It is an unsaturated polyester and organic synthetic raw material. Maleic anhydride is used to identify cyclic compounds generated by conjugated diene reactions.