精对苯二甲酸氧化残渣中苯甲酸的分离回收

Study on recovery of benzoic acid in residue from oxidation unit of purified terephthalic acid

针对厦门翔鹭石化公司精对苯二甲酸(PTA)生产装置直接外排的PTA氧化残渣,分析了其成分及组成;采用水萃取法和升华法2种回收方法来回收PTA氧化残渣中的苯甲酸,并考察了其影响因素。采用水萃取法最终产品得率为23.90%,纯度为90.74%;采用升华法最终产品得率为90.93%,纯度接近100%。

The content and composition of residue from the oxidation unit of purified terephthalic acid in Xiamen Xianglu Petrochemicals Co.Ltd.are analyzed.The benzoic acid in the above mentioned residue is recovered by water extraction and sublimation method,and the influencing factors are discussed.The yields of final products are 23.90% and 90.93% separately by water extraction and by sublimation,the purities of the products are 90.74% and nearly 100% separately by water extraction and by sublimation.