活性炭负载固体碱催化剂催化制备蔗糖酯

Synthesis of Sucrose Esters over Solid Base Catalyst Loaded on Activated Carbon

采用等体积浸渍法制备活性炭负载固体碱催化剂,利用正交试验法优化催化剂制备条件,并考察了反应条件对蔗糖和亚油酸甲酯合成蔗糖酯产率的影响。结果表明,催化剂制备的优化条件为碳酸钾与活性炭质量比0.5,活性炭粒径350μm,浸渍时间3h,煅烧温度500℃,煅烧时间3h。以该条件下制备的活性炭负载固体碱为催化剂,在亚油酸甲酯和蔗糖物质的量之比2:1,催化剂质量分数6%,硬脂酸钾质量分数1.5%,反应温度135℃和反应时间3h的条件下,蔗糖酯产率为86.0%。该催化剂在不经任何活化处理重复使用4次后,仍具有较好的催化活性。

The solid base catalyst K20/C was prepared by impregnation and the conditions of preparation of the catalyst was optimized by orthogonal experiment. The conditions of synthesis of sucrose esters from methyl linoleate and sucrose on the yield of sucrose esters were investigated. The results showed that the catalyst exhibited good catalytic performance, which were prepared under the conditions of mass ratio of K2CO3 to activated carbon 0.5, particle diameter of activated carbon 350 μm, impregnation time 3 h, calcination temperature 500 ℃ and calcination time 3 h. Under the conditions of molar ratio of methyl l inoleate to sucrose esters 2：1, mass fraction of catalyst 6%, mass fraction of potassium stearate 15%, reaction temperature 135 ℃ and reaction time 3 h, the yield of sucrose esters reached 86.0%. K2O/C catalyst showed steady catalytic activity after used four times with no activation treatment.