通过单因素试验和正交试验(L9(3)4)系统地研究了蒸发温度、进料速度、进料温度和冷凝温度对分子蒸馏纯化不饱和单甘酯质量比D/F的影响，影响D/F值的因素从大到小为：蒸发温度>进料流速>进料温度>冷凝温度。建立了轻相中单甘酯和甘二酯的含量对不同蒸发温度下的二次回归方程，将模型值同实验值进行比较，得到的数学模型和实验值很吻合。最后考察了不同操作条件下不饱和单甘酯的回收率，当蒸发温度为170-190℃之间，进料速度为0.71mL/min，进料温度为70℃，冷凝温度为60℃时，只通过一步分子蒸馏，轻相中的MAG的纯度可以提高到80%以上，MAG的回收率在60%到80%之间。

Single-factor experiments and orthogonal tests were carried out to reveal the effects of such operation conditions as evaporation temperature（θe）,feed flowrate（Q）,feed temperature（θf） and condensation temperature（θc） on the mass ratio D/F of the distillate stream to the feed during the purification of unsaturated monoglyceride by molecular distillation,and an order of the operation conditions affecting the D/F value was found as θe〉Q〉θf〉θc.Then,two quadratic regression equations were established to predict the content of monoglyceride（MAG） and diglyceride（DAG） in the distillate stream at different evaporation temperatures.Moreover,to verify the reliability of the equations,some tests were performed respectively at the feed flowrate of 0.71,1.06,1.42mL/min and the evaporation temperature of 150～200℃,and the results were found to accord well with those predicted by the mo-del.Finally,the variation of unsaturated MAG recovery in the distillate stream with operation conditions was investigated.The results show that,at an θe of 170～190℃,a feed flowrate of 0.71mL/min,a θf of 70℃ and a θc of 60℃,the purity of MAG in the distillate stream is up to more than 80% only with a single-step molecular distillation,and the MAG recovery varies from 60% to 80%.