文档介绍：GC-MS Analysis of Cortex Magnolia officinalis oil Separated by Molecular Distillation
YUAN Yu-Jie,Yu Shao-Chong,GE Faeffect, anti-arrhythmic effect and anti-oxidating effect,etc.
Molecular distillation (MD) is a gentle method appropriate for the separation and purification of thermally unstable materials as well as compounds with a low vapor pressure and high molecular weight, without the hazard of thermal decomposition. This method is characterized by a short exposure of the distilled liquid to elevated temperatures, high vacuum in the distillation space, and small distance between the evaporator and the condenser. Centrifuagal, scraping and falling films are the basic types of molecular distillation units that use a short exposure of the distilled liquid to the evaporating cylinder. The product to be processed is combined with a heavy or lighter component. And then is passed through the short-path evaporator and then recuperated as a first other parts are condensed on the walls of this first short-path evaporator; the most volatile parts are condensed with light solvents in the middle of the evaporator and pumped into a second evaporator. There again, other parts of the oil are concentrated and recuperated as a second distillate.
In contrast to conventional methods, such as column chromatography and recrystallization, MD can avoid using any organic sol