文献类型：期刊文献

英文题名：p-Xylene catalytic oxidation to terephthalic acid by ozone

作者：Pan, Helin[1];Li, Shuting[1];Shu, Mingjie[1];Ye, Yuwei[1];Cui, Qiuhua[1];Zhao, Zhixiang[1]

机构：[1]East China Univ Sci & Technol, Sch Chem Engn, Shanghai 200237, Peoples R China

年份：2018

卷号：44

期号：3

起止页码：212

外文期刊名：SCIENCEASIA

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000445543200008)】；

语种：英文

外文关键词：cobalt acetate; Co-Br catalyst; reaction mechanism; process optimization

摘要：The process of p-xylene (PX) catalytic oxidation to terephthalic acid (TA) was studied at 60-110 degrees C and atmospheric pressure with cobalt acetate as catalyst, glacial acetic acid as solvent, and ozone-containing air as oxidant. Effects of catalyst, temperature, ozone concentration, reaction time, and bromide on PX conversion and product selectivity were investigated. Results showed that PX was oxidized with 76% conversion and 84% selectivity for TA at 80 degrees C under 63.0 mg/l ozone concentration for 6 h at 0.8 l/min gas flow rate when the mole ratio of PX to cobalt acetate was 10:1. PX conversion and TA selectivity could reach 96% and 84% when the mole ratio of PX to KBr was 1.84:1. When cobalt acetate, ozone, and bromide were simultaneously used, an obvious synergistic effect on the PX oxidation reaction was noted. Increasing the temperature gradually weakened the effect because the decomposition rate of ozone was accelerated.