马来酸酐别称顺丁烯二酸酐（MAH），通称顺酐，是顺丁烯二酸的酸酐，室内温度下以有酸味的没有颜色或乳白色固态，化学式为C4H2O3。
Maleic anhydride, also known as maleic anhydride (MAH), is the anhydride of maleic acid. It is a colorless or milky solid with sour taste under indoor temperature, and the chemical formula is c4h2o3.
存储常见问题：存储于荫凉、干躁、自然通风优良的仓库。杜绝火种、热原。维持器皿密封性。应与还原剂、氧化剂、酸类、服用化工品分离储放，切勿混储。配置相对种类和总数的消防设备。储区应常备适合的原材料收容泄露物；
Common storage problems: store in a cool, dry and well ventilated warehouse. Put an end to kindling and pyrogen. Maintain vessel tightness. It should be stored separately from reductants, oxidants, acids and chemicals, and should not be mixed. Configure fire-fighting equipment of relative type and total number. The storage area should always be equipped with suitable raw materials to contain leakage;
辨别顺酐和顺酸的方式：
How to distinguish maleic anhydride and maleic acid:
1、称量大概同样的量，自来水融解后，再用碱滴定管，耗费碱多的是酐，耗费碱少的是酸。
1. Weigh about the same amount. After the tap water is dissolved, use an alkali burette. What consumes more alkali is anhydride, and what consumes less alkali is acid.
2、或取小量同样量的试品融解于水，用pH计检验，pH值低的是酐，pH稍高的是酸。
2. Or take a small amount of the same amount of the test sample and dissolve it in water, and test it with a pH meter. The low pH value is anhydride, and the slightly higher pH value is acid.
3、用溶点检验还可以，酐与酸的溶点不一样。顺酐约52~53℃，顺酸约130℃。
3. The melting point test is also OK. The melting point of anhydride and acid is different. Maleic anhydride is about 52~53 ℃, and CIS acid is about 130 ℃.
4、^简易的方法，找一小块不锈钢板片，将二种试品各放一点于钢板两边，用火机在2个试品正中间加温，先汽化并蒸发的是顺酐。
4. ^ a simple method is to find a small piece of stainless steel plate, put a little of the two samples on both sides of the steel plate, heat the middle of the two samples with a lighter, and the maleic anhydride is vaporized and evaporated first.
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