Through this period of understanding, I believe that everyone is no stranger to Shandong phthalic anhydride, but for customers who want to further understand the relevant knowledge of this product is not enough. Today, Xiaobian will share with you the knowledge about Shandong phthalic anhydride content, hoping to attract everyone's attention and let everyone have a deep understanding of Shandong phthalic anhydride. In this way, everyone can be sure when buying and using xxx, don't panic, I hope to inspire and help everyone. 1. Free acidity: 0.1000g Shandong phthalic anhydride in a 150ml angle bottle, 50ml methyl ethyl ketone is dissolved, and the indicator bromophenol blue is titrated with a standard triethylamine solution until the green color just turns blue-purple.
2. Total effective acidity: 0.1000g of phthalic anhydride in a 150ml angular flask, boil 150ml of deionized water, titrate with 0.1000molNaOH while hot, the indicator is phenolphthalein, and the endpoint is slightly pink.
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