返滴定法测定聚酯浆料中PTA含量

摘要

以吡啶为溶剂测定浆料中PTA含量的方法毒性大,污染环境。返滴定法使用过量的一定浓度的KOH溶液与浆料中PTA反应,再采用电位滴定法,用硫酸标准溶液滴定过量KOH。根据消耗硫酸的体积,计算出浆料中PTA的含量。试验结果表明,返滴定法测试结果准确、快捷、无毒。%The determination of PTA with pyridine as solvent is very poisonous and pollutes the environment. Use certain amount of certain concentration KOH solution to react with PTA. Then use sulfuric acid standard solu- tion to titrate the remaining KOH by potentiometric titration, and calculate the Content of FFA in the paste. The re- sult shows that data of back titration method is precise, and the method is quick, simple and non poisonous.