摘要
运用沉淀—浸渍法制得稀土改性固体超强酸SO2-4/CeO2-Fe3O4-SiO2。以丙酸与甘油合成丙酸甘油酯为探针反应。探讨了酸醇物质的量比、催化剂的用量、反应时间、带水剂的种类及用量等因素对酯化率的影响,并对催化剂的重复使用情况进行了考察。得到最佳反应条件:酸醇摩尔比为3:1,催化剂的用量为反应物料用量的3%,带水剂二甲苯用量为反应物用量的50%,反应时间为3.5 h,此时的酯化率达到97.28%,催化剂重复使用第4次酯化率仍达到80.00%,产品经折光率、FTIR及GC-MS分析知确为目标产物,其纯度为96.83%。
The rare earth modified solid super acid SO42-/CeO2-Fe3O4-SiO2 was prepared by coprecipitation-impregnating method.The influencing factor on esterification rate such as molar ratio of glycerin to propionic acid,catalyst dosage,reaction time,type and amount of water-carrying agent and the situation of the catalyst used in repeated experiments were investigated.The optimal reaction conditions were：the mole ratio of propionic acid to glycerin 3 ∶ 1,the dosage of catalyst was 3％ of the total reaction materials,xylene was used as water-carrying agent and was added to 50％ of the total reaction materials,reaction time was 3.5 h.In the above conditions the esterification rate was up to 97.28％,the esterification rate reached 80.00％ even the catalyst was reused for four times.The product was confirmed to be glyceryl tripropionate by refractive index FTIR spectra and GC-MS.The purity of the product reached 96.83％ by GC-MS.
出处
《中国食品添加剂》
CAS
北大核心
2013年第6期71-76,共6页
China Food Additives
基金
广东省自然科学基金(S2012040007383)
肇庆市科技计划项目(2012G030)
肇庆市科技创新计划项目(2011G28)
肇庆学院青年项目(201110)
