微通道反应器中二氯丙醇环化反应研究

Researches on cyclization reaction of dichloropropanol in the micro-channel reactor

研究了微通道反应器内二氯丙醇的环化制备环氧氯丙烷的反应,考察了反应温度、原料配比、停留时间等单因素对环氧氯丙烷收率的影响。实验确定了较优的工艺参数组合:环化反应温度50℃,二氯丙醇与氢氧化钠的摩尔比1∶1.2,停留时间45 s,NaOH质量分数20%时,ECH的收率达到95.2%。在微通道反应的时空转化率要比常规反应高出2个数量级。与传统的工艺方法相比,微通道反应中环氧氯丙烷的收率提高了10%,降低了过程的能耗,废水排放量减少了45%。

The cyclization reaction of dichloropropanol to preapare epoxy chloropropane in the micro-channel reactor was investigated in this study. The influences of reaction temperature, ratio of two materials and the detention time on the yield of epoxy chloropropane were carried out. The optimal reaction conditions are shown as follows：50~C of reaction temperature, 1：1.2 of molar ratio of dichloropropanol and NaOH ,45 seconds of detention time and 20 wt% of sodium hydroxide solution concentration. The yield of the epoxy chloropropane can reach 95.2%. The STC in micro-channel reactor is 100 times greater than that in the regular reaction. Compared with the traditional process, this new micro- channel reaction process increases the yield of epoxy chloropropane by 10% , decreases the waste water discharge by 45% and reduces the energy consumption at the same time.