环氧法制备环氧氯丙烷的工艺参数优化研究

Parameter optimization study on fabricating epichlorohydrin by peroxide hydrogen oxidation

采用钛硅分子筛作为催化剂,在固定床反应器中采用双氧水氧化氯丙烯的方法制备环氧氯丙烷.为优化反应操作工艺,通过小试重点分析了原料进料速率、催化剂、反应温度、溶剂、双氧水、氯丙烯等对原料转化率的影响,结果表明：钛硅分子筛催化剂与惰性物质二氧化硅的质量比为1∶2~1∶5,氯丙烯与双氧水物质的量的比为2∶1~8∶1,溶剂甲醇与氯丙烯的质量比为2∶1~7.5∶1,在空速为1440~2880mL·h-1,反应温度为25~75℃的情况下发生反应,制得环氧氯丙烷的最终收率大于70%.

Epichlorohydrin was synthetized via direct epoxidation of chloropropene in fixed bed reactor using titanium-silicon zeloite as a catalyst.In order to optimize the reaction process,the analysis was focused on the effects of the feed rate,the amount of catalyst,reaction temperature,amount of solvent,hydrogen peroxide concentration,and chloropropene content on the conversion rate of raw materials.The results showed that under the reaction conditions that the quality ratio of titanium silicon molecular sieve catalyst and inert silica was 1∶2~1∶5,the mole ratio of chloropropene and hydrogen peroxide was 2∶1~8∶1,the quality ratio of methanol and propylene chloride was 2∶1~7.5∶1,the space velocity was 1440~2880mL·h-1,and the reaction temperature was 25~75℃,the final yield of epichlorohydrin is greater than 70%.