混合C_9芳烃异丁烯催化烷基化合成均三甲苯

Synthesis of mesitylene by catalytic alkylation of mixed C9 arenes and isobutene

以异丁烯为烷基化试剂,使用AlCl3催化剂,采用二次烷基化二次蒸馏工艺,以混合C9芳烃为基本原料,合成出纯度高达98.5%以上的工业均三甲苯。实验结果表明,蒸馏可将邻甲乙苯反应后生成的重组分除去,异丁烯难以与均三甲苯反应;烷基化反应最佳工艺条件:n(异丁烯)/n(C9芳烃)为1.2,m(AlCl3)/m(C9芳烃)为0.08,m(助催化剂)/m(C9芳烃)为0.002,反应温度60℃,一次烷基化异丁烯通入速度40L/h(前1h)或20L/h(1h后),二次烷基化异丁烯通入速度8.6L/h。

The commercial mesitylene with purity above 98.5% was synthesized with isobutene as alkylating reagent, AlCl3 as catalyst, mixed C9 arenes as feedstock by secondary alkylation and secondary distillation process. The results showed that the heavy compoment could removed by distillation. Isobutene was difficult to react with mesitylene. The optimum conditions for alkylation were ditermined that isobutene/mixed C9 arenes was 1. 2, AlCl3/mixed C9 arenes was 0.08, catalyst/mixed C9 arenes was 0. 002, reaction temperature was 60℃, the addtion rate of isobutene in primary alkylation was 40 L/h ( the first 1 h) or 20 L/h ( the second 1 h) ,the addition rate of isobetene in secondary alkylation was 8.6 L/h.