鑒別順酐和順?biāo)岬姆椒ǎ?
The method of identifying maleic anhydride and maleic acid was as follows
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 titrate with alkali. The more alkali consumed is anhydride, and the less alkali consumed is acid.
2、或取少量相同量的樣品溶解于水，用pH計(jì)檢測(cè)，pH值低的是酐，pH稍高的是酸。
2. Or take a small amount of the same amount of sample dissolved in water, detected by pH meter, the lower pH is anhydride, the higher pH is acid.
3、用熔點(diǎn)檢測(cè)也可以，酐與酸的熔點(diǎn)不同。順酐約52~53℃，順?biāo)峒s130℃。
3. The melting point of anhydride is different from that of acid. Maleic anhydride is about 52 ~ 53 ℃ and CIS 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(diǎn)于鋼片兩側(cè)，用打火機(jī)在兩個(gè)
4. A simple way is to find a small piece of stainless steel plate, put two kinds of samples on both sides of the steel plate, and use a lighter in two
樣品中間加熱，先液化并揮發(fā)的是順酐。
When the sample is heated in the middle, maleic anhydride is liquefied and volatilized first.
