碳酸二月桂酯的合成研究

Study on synthesis of didodecyl carbonate

以碳酸二甲酯(DMC)和正十二醇(C12H25OH)为原料,采用Fe2O3/黏土作催化剂,经酯交换反应制备出碳酸二月桂酯(DDC)。考察了酯化反应条件对产物收率的影响,结果表明:在n(C12H25OH):n(DMC)为3、催化剂占原料质量分数为5%,反应温度为130℃、反应时间为2 h的最佳条件下,DDC及总酯的收率分别为46.04%,74.40%;此条件下所得DDC产物在100,40℃时的运动黏度分别为2.200,8.606 mm2/s,黏温指数为37.04,适合作为中黏度指数润滑油。

The didodecyl carbonate （DDC） was prepared by transesterification with dimethyl carbonate（DMC） and dodecanol as materials, iron trioxide/clay as catalyst. The effect of reaction conditions on the yield of products were investigated. The results showed that the optimum reaction conditions were： the mole ratio of dodecanol to DMC 3, the mass fraction of catalyst to materials 5% , the temperature 130 ℃ ,reaction time 2 h. Under these conditions,the yield of DDC and the total ester yield were 46.04% , 74.40% respectively, the kinematic viscosity of product was 2. 200 mm2/s at temperature of 100 ℃, and 8.606 mm2/ s at temperature of 40 ℃ ,the viscosity index was 37.04, so that DDC was suitable to be medium viscosity index lubricant.