分子蒸馏纯化亚油酸的工艺条件优化

采用超临界CO2萃取技术提取红花籽油,用分子蒸馏技术纯化其中亚油酸.在单因素实验的基础上通过正交实验对影响分子蒸馏效果的蒸馏压力、蒸馏温度、进料量、刮膜器转速等主要因素进行了优化,得到刮膜式分子蒸馏装置纯化红花籽油中亚油酸的最佳工艺参数为：蒸馏压力0.3,Pa、蒸馏温度180,℃、进料量60,mL/h、刮膜器转速300,r/min,在该条件下得到重组分中亚油酸的纯度为91.6%,收率为88.64%.4级分子蒸馏后重组分中的亚油酸纯度达到93.51%,但收率从92.67%下降至49.45%.

Optimization of Process Conditions on Purifying the Linoleic Acid by Molecular Distillation

Extracting and refining safflower seed oil using supercritical CO2 fluid extraction technology combined with molecular distillation were investigated.The influence of distillation pressure,distillation temperature,feed rate and agitating speed on the purity of linoleic acid were analyzed by the orthogonal test.The technological parameters optimized by orthogonal test were as follows：distillation pressure 0.3,Pa,distillation temperature 180,℃,feed rate 60,mL/h,agitating speed 300,r/min.The content of linoleic acid of safflower seed oil reached up to 91.6% and the yield was 88.64% under the optimum conditions.Linoleic acid was purified up to 93.51% by a four-stage molecular distillation,but the yield was declined,from 92.67% to 49.45%.