甘油合成环氧氯丙烷氯化阶段催化剂选择研究

Study on the Chlorination Catalyst for the Synthesis of Epichlorohydrin from Glycerol

针对甘油法合成环氧氯丙烷第一阶段——氯化阶段的工作,对催化剂进行筛选与复配实验,确定了具有较好催化活性且环境友好的二元催化剂配方——己二酸与乙酸酐。该催化剂在反应温度为115℃,反应时间为5 h,原料甘油40 g,氯化氢通气量200 m L/min,催化剂总量为甘油的7.5%(m/m),m(己二酸)∶m(乙酸酐)=3∶2时,二氯丙醇收率69.5%,甘油转化率达99%。

The preparation process of epichlorohydrin from glycerol includes two steps of chlorination and cyclization. The catalysts used in the chlorination step were investigated. The binary system of adipic acid and acetic anhydride was found to be an environmentally friendly and active catalyst. The results showed that the yield of dichloropropanol and conversion rate of glycerol was 69.5% and 99%, respectively, under the following conditions：temperature 115℃, reaction time 5 h, glycerol 40 g, flow rate of gaseous hydrogen chloride 200 m L/min, loading of catalyst 7.5%（m/m glycerol）, ratio of adipic acid to acetic anhydride 3 to 2.