馬來酸酐別稱順丁烯二酸酐（MAH），通稱順酐，是順丁烯二酸的酸酐，室內溫度下以有酸味的沒有顏色或乳白色固態，化學式為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.
存儲常見問題：存儲于蔭涼、干躁、自然通風優良的倉庫。杜絕火種、熱原。維持器皿密封性。應與還原劑、氧化劑、酸類、服用化工品分離儲放，切勿混儲。配置相對種類和總數的消防設備。儲區應常備適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;
辨別順酐和順酸的方式：
How to distinguish maleic anhydride and maleic acid:
1、稱量大概同樣的量，自來水融解后，再用堿滴定管，耗費堿多的是酐，耗費堿少的是酸。
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、或取小量同樣量的試品融解于水，用pH計檢驗，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、用溶點檢驗還可以，酐與酸的溶點不一樣。順酐約52~53℃，順酸約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、^簡易的方法，找一小塊不銹鋼板片，將二種試品各放一點于鋼板兩邊，用火機在2個試品正中間加溫，先汽化并蒸發的是順酐。
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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