順酐廠家為大家講解鑒別順酐和順酸的方法：
The maleic anhydride manufacturer will explain the method of identifying maleic anhydride and maleic acid:
1、稱取大約相同的量，用水溶解后，再用堿滴定，消耗堿多的是酐，消耗堿少的是酸。
1. Weigh about the same amount, dissolve it with water, and then titrate it with alkali. Anhydride consumes more alkali and acid consumes less alkali.
2、或取少量相同量的樣品溶解于水，用pH計檢測，pH值低的是酐，pH稍高的是酸。
2. Or take a small amount of the same amount of sample to dissolve in water and test it with a pH meter. The anhydride with low pH value and the acid with slightly higher pH value.
3、用熔點檢測也可以，酐與酸的熔點不同。順酐約52~53℃，順酸約130℃。
3. It can also be detected by melting point. The melting point of anhydride and acid is different. Maleic anhydride is about 52 ~ 53 ℃, and maleic acid is about 130 ℃.
4、^簡單的辦法，找一小塊不銹鋼片，將兩種樣品各放一點于鋼片兩側，用打火機在兩個樣品中間加熱，先液化并揮發的是順酐。
4. ^ a simple way is to find a small piece of stainless steel sheet, put a little of the two samples on both sides of the steel sheet, and heat them with a lighter. Maleic anhydride is liquefied and volatilized first.
