摘要
采用清洁生产工艺,以钛硅分子筛TS-1为催化剂,使用绿色氧化剂低浓度H2O2水溶液氧化合成4-甲基邻苯二酚,并考察了影响产品收率的主要因素。结果表明,在n(过化氢)∶n(4-甲酚)=0.33,催化剂用量为10%,反应温度:83℃,滴加30%H2O2水溶液,滴加时间4h,滴加完毕后继续反应2h的条件下,4-甲酚转化率:21.82%,4-甲基邻苯二酚收率:15.86%,选择性:72.7%。
The catalytic performance of zeolite TS- 1 catalyst for the hydroxylation of 4- cresol to 4- methy- lcatechol with green oxidant hydrogen peroxide was evaluated in clean production techniques. The influence of reaction conditions was studied. The results indicated that, under optimal hydroxylation conditions：feed molar ratio hydrogen peroxide to 4- cresol 0.33,catalyst to 4- cresol 10% （ wt ） , reaction temperature 83℃ , hydrogen peroxide concentration 30% （ wt ） , hydrogen peroxide being added dropwise during 4 h, then continuing to be reacted for 2 h, the conversion of 4- cresol was 21.82%, the selectivity of 4-methylcatechol 72.7% and the yield of 4- methylcatechol 15.86% o
出处
《天津化工》
CAS
2013年第1期19-21,共3页
Tianjin Chemical Industry
