Purified terephthalic acid is an important industrial chemical. Mainly used in the production of polyester resins, plasticizers and poultry additives. In industrial refined terephthalic acid, there are impurities p-carboxybenzoic acid, p-toluic acid, benzoic acid and so on. This article is based on the industry standard SH / T1612.7-95 issued by China Petroleum & Chemical Corporation in 1995, using high-performance liquid chromatography and ion exchange mechanism to analyze and detect the content of impurities in purified terephthalic acid. The separation effect is good and meets the standard requirements.
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