分子蒸馏技术精制柠檬精油工艺

Refine of Lemon Essential Oil by Molecular Distillation Technology

采用分子蒸馏技术对柠檬精油进行浓缩精制,分别考察了温度、压力和刮膜转速对浓缩精油中柠檬醛浓度的影响。通过单因素试验和正交设计试验,确定了最佳工艺条件:蒸馏压力40 Pa,蒸馏温度45℃,刮膜转速240 r/min。浓缩精油经过气相色谱仪(GC)测定,柠檬醛质量浓度由1.41 mg/m L上升至11.17 mg/m L,浓缩倍数达7.9。经过分子蒸馏后的浓缩精油呈深棕色,质地浓稠,气味浓郁、醇厚。

In this study,the lemon essential oil was purified and separated by molecular distillation.The effects of distillation temperature,film rotation speed and distillation pressure on the concentration of citral were studied respectively.On the basis of single factor experiments,the technological parameters were optimized by orthogonal tests including three factors and three 1 evels.The best conditions of molecular distillation were the distillation temperature of 45℃,film rotation speed of 240 r/min and distillation pressure of 40 Pa.The concentrated essential oil was determined by the gas chromatograph(GC),the concentration of citral increased from 1.41 mg/m L to 11.17 mg/m L,and the concentration increased 7.9 folds.The color of concentrated essential oil was dark brown,the texture was thick,and the flavor was stronger and mellower.