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以牛羊油半饱和脂肪酸(以下简称半饱和脂肪酸)和二乙醇胺为原料,采用减压蒸馏脱水和酯的胺解二步合成法,合成了半饱和脂肪酸二乙醇酰胺。考察了各个反应参数的影响,结果表明:半饱和脂肪酸和二乙醇胺总摩尔比为1.0∶1.1,第一步酰化反应中两者摩尔比控制为1.0∶0.9,在135℃下反应3.0h;第二步胺解反应时加入剩余的二乙醇胺,在90℃下反应4.0h。胺解时催化剂的用量为半饱和脂肪酸质量的1.5%时,半饱和脂肪酸二乙醇酰胺的产率为89.52%。
The half-saturated fatty acid diethanolamide was synthesized by the two-step aminolysis method using vacuum distillation and dehydration and the ester-half-saturated fatty acid (hereinafter referred to as “half-saturated fatty acid”) and diethanolamine as raw materials. The effects of various reaction parameters were investigated. The results showed that the molar ratio of saturated fatty acids to diethanolamine was 1.0:1.1. The molar ratio of the two was 1.0: 0.9 in the first step and 3.0 h at 135 ℃. The second step amineysis reaction was added the remaining diethanolamine, at 90 ° C for 4.0h. When the amount of the catalyst is 1.5% of the mass of the semi-saturated fatty acid during the amine decomposition, the yield of the semi-saturated fatty acid diethanolamide is 89.52%.