硫酸-重铬酸钾氧化改性活性炭催化合成三醋酸甘油酯

采样H2SO4-K2Cr2O7氧化改性活性炭为催化剂,甘油和醋酸为原料,合成三醋酸甘油酯,考察了催化剂用量、甘油醋酸比、反应温度,反应时间、带水剂用量对反应的影响。经过多次实验,得到合成三醋酸甘油酯的最佳工艺条件：催化剂用量（占总投料质量分数）2.5%,物料比n（甘油）/n（醋酸）=1：5.5,反应温度130℃,反应时间2 h,带水剂甲苯用量20 mL,产品收率达91.5%,催化剂可重复使用。

Catalytic Synthesis of Glyceryl Triacetate With H_2SO_4-K_2Cr_2O_7 Modified Activated Carbon

Glyceryl triacetate was synthesized from glacial acetic acid and glycerol by using H2SO4-K2Cr2O7 modified activated carbon as catalyst.The best synthesis condition of glycerol triacetate was investigated.The experiment results show that the optimum reaction conditions are as follows： molar ratio of glacial acetic acid to glycerol is 1：5.5,dosage of H2SO4-K2Cr2O7 modified activated carbon as catalyst is 2.5%,reaction temperature is 130 ℃,reaction time is 2 h,dosage of toluene as water-carrying agent is 20 mL.Under above conditions,esterification yield can reach to 91.5%,and the catalyst can be reused.