【摘要】 以大豆油和三乙酸甘油酯为原料,利用甲醇钠为催化剂,通过酯交换反应,制备短碳链的脂肪酸甘油酯,即低热量油脂。考察了原料物质的量比、反应温度、反应时间、催化剂的用量对酯交换反应产率的影响。通过单因素和正交试验,找出了制备该产品的最佳工艺条件:原料物质的量比为3∶1,反应温度为120℃,反应时间为1.5 h,甲醇钠用量为底物的0.975%(质量分数比)。由色谱分离和分析技术测定,在该反应条件下,反应混合物中产品含量为73.14%,由量热法测定产品的热值为32 450 J/g,约为大豆油热值的71%,故改性能够达到降低热值的目的。更多还原

【Abstract】 Short-chain triglycerides as the low calorie oil had been produced by transesterification with soy-bean oil and glycerol triacetate by sodium methoxide as catalyst. The effects of molar ratio of the raw substrates,reac-tion temperature,reaction time and catalyst using amount on the product yields have been investigated in the paper. The orthogonal experiment results showed that the optimal reaction conditions were thesubstrate molar ratio of 3∶ 1,re-action temperature of 120 ℃,reaction time of 1. 5 h,and adding 0. 975% sodium methoxide amount per gram of sub-strate( mass ratio). On the conditions,the reaction yield was 73. 14%. The calorific values of the soybean oil and the product were measured and the value for the later was 32 450 J / g which was approximately 71% of the former.更多还原