分子蒸馏脱除核桃油中塑化剂工艺优化

Optimization of removal of plasticizers from walnut oil by molecular distillation

为探索利用分子蒸馏脱除核桃油中塑化剂的合理工艺,采用单因素实验考察了蒸馏温度、进料速度和刮膜转速对核桃油中塑化剂DEHP和DBP脱除的影响,在此基础上以DEHP和DBP的含量为指标,运用响应面法对分子蒸馏脱除核桃油中塑化剂的工艺条件进行优化。结果表明:分子蒸馏脱除核桃油中塑化剂的最佳工艺条件为蒸馏温度150℃、进料速度250 mL/h、刮膜转速260 r/min,在此条件下核桃油中DEHP含量为0.56 mg/kg,DBP含量为0.05 mg/kg,符合我国对食品中DEHP、DBP的限量要求(DEHP≤1.5 mg/kg,DBP≤0.3 mg/kg)。

In order to explore the reasonable process for removing plasticizers from walnut oil by molecular distillation,the effects of distillation temperature,feed rate and scraper speed on the removal of plasticizers DEHP and DBP from walnut oil were studied by single factor experiment.Then with the contents of DEHP and DBP as indexes,the process conditions of molecular distillation to remove plasticizers from walnut oil were optimized using response surface methodology.The results showed that the optimal process conditions for the removal of plasticizers from walnut oil by molecular distillation were obtained as follows:distillation temperature 150℃,feed rate 250 mL/h,and scraper speed 260 r/min.Under these conditions,the contents of DEHP and DBP were 0.56,0.05 mg/kg,respectively,in accordance of the limitation requirements of food in China(DEHP≤1.5 mg/kg,DBP≤0.3 mg/kg).