Sn-MCM-22分子筛催化1,3-二羟基丙酮制备乳酸酯  

Synthesis of alkyl lactates from 1,3-dihydroxyacetone catalyzed by Sn-MCM-22 catalyst

作　　者：贾冰[1,3] 董士花 孙伟振 黄昕 蒋越洋 李青松 JIA Bing;DONG Shihua;SUN Weizhen;HUANG Xin;JIANG Yueyang;LI Qingsong(The State Key Lab of Heavy Oil Processing,China University of Petroleum-East China,Qingdao 266580,Shandong,China;College of Materials Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,Shandong,China;Qingdao Haiwan Group Co.,Ltd.,Qingdao 266000,Shandong,China)

机构地区：[1]中国石油大学(华东)重质油国家重点实验室,山东青岛266580 [2]山东科技大学材料科学与工程学院,山东青岛266590 [3]青岛海湾集团有限公司,山东青岛266000

出　　处：《精细化工》2020年第11期2294-2300,共7页Fine Chemicals

基　　金：中国石油大学(华东)研究生创新工程资助项目(YCXJ2016049)。

摘　　要：以MCM-22分子筛为原料,采用SnCl4·5H2O对其后处理改性合成了Sn-MCM-22催化剂,用于催化1,3-二羟基丙酮(DHA)与醇反应制备乳酸酯。XRD、SEM、N2吸附-脱附、UV-Vis和Py-IR表征结果显示,Sn以离子形式插入到分子筛孔和SnO2接枝的方式来改性MCM-22,改性催化剂具有强Lewis和Brønsted复合双酸性位点,可有效催化DHA制备乳酸酯。结果表明,选用Sn-MCM-22催化剂催化DHA甲醇溶液(0.25 mol/L),反应温度120℃,反应时间15 h,乳酸甲酯收率达96.3%。该催化剂催化DHA与乙醇、正丙醇、正丁醇反应,相应的乳酸酯收率在86.4%~88.4%之间,催化剂具有良好的循环稳定性。Sn-MCM-22 catalysts were synthesized from MCM-22 molecular sieve by post-treatment SnCl4·5H2O and used as catalyst to convert 1,3-dihydroxyacetone(DHA)and different alcohols into alkyl lactates.The catalysts were characterized by XRD,SEM,N2 adsorption-desorption,UV-Vis and Py-IR.The results demonstrated that MCM-22 molecular sieve was modified by inserting Sn into molecular sieve pore and grafting SnO2.Sn-MCM-22 catalysts possessed Lewis and Bronsted acid sites,and could effectively catalyze DHA to prepare alkyl lactates.It was found that the yield of methyl lactate reached 96.3% under the conditions of DHA methanol solution of 0.25 mol/L,reaction temperature of 120℃,and reaction time of 15 h.In addition,the catalyst was used to catalyze the reactions between DHA and ethanol,n-propanol,and n-butanol,and the yields of the corresponding alkyl lactates was in the range from 86.4% to 88.4%.Moreover,the catalyst displayed good cycling and stability performance.

关 键 词：乳酸酯 1 3-二羟基丙酮 后处理合成方法 催化技术 

分 类 号：TQ426[化学工程]