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順丁烯二酸酐又名馬來酸酐或失水蘋果酸酐，常簡稱順酐。無色正交針狀結晶或白色結晶性粉末，有強烈刺激氣味，凝固點52.8℃，沸點202℃，易升華。溶于水、丙酮、苯、氯仿等多數有機溶劑。主要由苯或碳四餾分中的正丁烷或丁烯氧化而制得，是生產不飽和聚酯及有機合成的原料。

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.

順丁烯二酸酐在25℃時在下列溶劑中的溶解度( gllOOg)：丙酮227，乙酸乙酯112，氯仿52.5 I苯50 I甲苯23.4；鄰二甲苯19.4；四氯化碳0. 60；石油醚0.25。溶于醇生成酯。溶于二氧六環。受熱升華。遇高熱、明火或與氧化劑接觸，有引起燃燒的危險。有腐蝕性。在冷水中緩慢水解，生成馬來酸。與強氧化劑接觸能引起燃燒和爆炸。若溫度超過66℃、與胺類或堿金屬接觸會發生聚合反應。

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.

鑒別:順丁烯二酸酐又名馬來酸酐，主要又苯或碳四餾分中的正丁烷或丁烯氧化而制得，是不飽和聚酯以及有機合成原料。順丁烯二酸酐用于鑒別共軛二烯反應生成環狀化合物。

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.