甘油催化转移氢解制备丙二醇及其反应机理.pdfVIP

Vo l. 40 No.3 第 40 患第 3 期 浙 u 工业大学学报 2012 年 6 月 JOURNAL OF ZHEJIANG UNIVERSITY OF TECHNOLOGY Jun. 2012 甘油催化转移氢解制备丙二醇及其反应机理 李菲，夏燕，应惠娟，计伟荣 {浙江工业大学化学1:程与材料学院，浙江航州 310032) 摘要:以 Raney Ni 为催化剂，甲醇为供氯体，水为客剂.对甘油催化转移氢解反应进行了研究，探讨 了反应温度和甘油浓度对氢解反应的影响，并对甘油催化转移氢解反应机理进行了初步探索.与传 统氢解方法相比，甘油催化转移氢解在较为法和的条件下得到了 1.2- 丙二量f..在温度为 210 C.廿 油初始浓度为 0.64 mol/ L. 反应时间为 12 h 的条件下，甘油转化率达到 54.7%.1.2 丙二醇的选 择性为 74.1%.-般情况下，在 Raney Ni 的催化作用下，甘油优先脱去伯位的要是基生成丙翻碎，随 后加氢生成 1.2-丙二醇. 关键词:甘油F 甲量事， 1 ， 2- 丙二醇z 转移氢解，Raney Ni 申圄分类号:TQ028.4 文献标志码:A 文章编号: 1006-4303(2012)03-0275-04 The study of catalytic transfer hydrogenolysis of glycerol to propylene glycol and its mechanism LI Fei. XIA Yan. YING Hui-juan. jl Wei-rong (College of Chemical Engieering 8. Material. Science. Zhejiang University 01 Technology. Hangzhou 310032. China) Abstract: Catalytic transfer hydrogenolysis (CTH) of glycerol was carried out over Raney Ni catalyst in aqueous media with methanol as the hydrogen donor. The effects of the temperature and initial molar concentration of glycerol on the reaction were investigated. A reaction mechanism was proposed. In comparison with the glycerol hydrogenolysis using hydrogen gas. the CTH of glycerol could be carried out under relatively mild reaction conditions. At 210 c a 54. 7 % conversion of glycerol was achieved after 12 hour reaction with an initial glycerol concentration of O. 64 mo l/L. and the selectivity of 1. 2-propylene glycol was up to 74. 1%. In general. the cleavage of Ihe primary hydroxyl group was in preference 10