二(二甲苯基)甲烷合成工艺条件优化研究

OPTIMIZATION OF THE TECHNIQUE SYNTHESIZING DIXYLYL METHANE

通过正交试验和梯度寻优试验，找到了二甲苯与甲醛合成二（二甲苯基）甲烷的优化工艺条件：二甲苯与甲醛的摩尔比８∶１，硫酸二甲基苯磺酸催化剂用量１０．０２５％、反应温度１２０～１４０℃及反应时间１４０ｍｉｎ。在最优工艺条件下，二（二甲苯基）甲烷收率可达７７．３８％

The concentrated sulfunic acid xylenesulfonic acid, catalyst used in the work, possesses high catalytic activity for the synthesis of dixylyl methane. The operating conditions were optimized with the regression orthogonal experiment design method following gradient optimization. They are as following: 8∶1 in the feed ratio of xylene and formaldehyde, 10.025 % in concentrated sulfunic acid, 120～140 ℃ in the reaction temperature and 140 min in the reaction time. Under the optimum conditions, the yield of dixylyl methane is 77.3 %.