均匀设计在酯化樟树籽油制备单甘酯中的应用

Application of Uniform Uesign in Preparation of Monoglyceride by Esterifying Camphor Tree Seed Oil

以樟树籽油为原料、对甲基苯磺酸为催化剂,通过酯化将樟树籽油中的游离脂肪酸转化为单甘酯。采用均匀设计和偏最小二乘回归法,以酯化率(Y1)和单甘酯的含量(Y2)的最大值为优化目标,考察反应温度、催化剂的用量、醇油物质的量配比、反应时间对樟树籽油酯化反应的影响。对两个试验指标进行回归建模,模型拟合的决定系数分别为0.9801、0.9739。最优目标函数值Y1、Y2分别为98.2%、12.2%,实测值分别为95.6%、14.4%,最佳酯化反应条件为反应温度132℃、催化剂的用量3.5%(油重)、醇油物质的量配比1.8:1、反应时间2h。

Esterification of camphor tree seed oil was catalyzed by toluenesulfonic acid,which led to the transformation of free fatty acids into monoglycerides.The performing condition for esterification of oil was optimized using uniform design and partial least-square regression method.The factors influencing esterification of camphor tree seed oil were studied including reaction temperature,amount of catalyst,mole ratio of glycerol to oil and reaction time.The esterification yield（Y1） and the content of monoglyceride（Y2）were analyzed.Model fitting and the determination coefficient were 0.9801 and 0.9739 through regression model of those two test index.The optimal esterification yield and the content of monoglyceride predicted by the models were 98.2 % and 12.2% whereas the actual test values were 95.6% and 14.4%,respectively.And the optimum reaction conditions for esterification were：temperature 132 ℃,amount of catalyst 3.5%（oil weight）,mole ratio of glycerol to oil 1.8：1 and reaction time 2 h.