PTA氧化残渣中苯甲酸和Co^2+、Mn^2+ 的分离回收  

Separation and recovery of benzoic acid and Co^2+,Mn^2+from PTA oxidation residue

作　　者：黄智贤 李明明 邱挺 HUANG Zhixian;LI Mingming;QIU Ting(College of Chemical Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]福州大学石油化工学院,福建福州350108

出　　处：《福州大学学报（自然科学版）》2020年第6期800-805,共6页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(21878054);福建省高校产学合作项目(2018H0016)。

摘　　要：采用混合溶剂双相浸取法处理精对苯二甲酸(PTA)的氧化残渣,对残渣中的苯甲酸和Co 2+、Mn 2+进行有效分离回收.研究结果表明:在浸取温度为30℃,乙酸异丁酯∶正庚烷∶0.2 mol·L-1硫酸水溶液∶干残渣=3∶3∶8∶1(质量比),浸取时间为30 min的条件下,有机相中苯甲酸浸取率达83%以上,纯度高于95%,水相中Co 2+、Mn 2+的浸取率分别为98.82%和99.31%.最后提出一个从氧化残渣中回收苯甲酸和Co 2+、Mn 2+的概念流程,实现残渣的资源化回收利用.Multiphase solvent leaching was adopted to treat PTA oxidation residue,benzoic acid and Co 2+、Mn 2+were separated and recovered,respectively.The results showed that benzoic acid extraction of over 83%and its purity of over 95%in organic phase were achieved under the conditions of 30℃,leaching 30 min,and mass ratio of isobutyl acetate∶n-heptane∶0.2 mol·L-1 H 2SO 4∶dry residue=3∶3∶8∶1.And at the same conditions Co 2+extraction efficiency of 98.82%and Mn 2+extraction efficiency of 99.31%in aqueous phase were achieved.The concept process of recovering benzoic acid,Co 2+,and Mn 2+from PTA oxidation residue was put forward to realize the resource utilization of the residue.

关 键 词：精对苯二甲酸 氧化残渣 浸取 苯甲酸 钴离子 锰离子 

分 类 号：TQ09[化学工程]