萃取精馏和恒沸精馏相似，也是向原料液中加入第三组分(称为萃取剂或溶剂)，以改变原有组分间的相对挥发度而得以分离。不同的是，要求萃取剂的沸点较原料液中各组分的沸点高很多,且不与组分形成恒沸液。萃取精馏常用于分离各组分沸点( 挥发度) 差别很小的溶液。例如，在常压下苯的沸点为80.1℃,环已烷的沸点为80.73 ℃,若在苯-环已烷溶液中加入萃取剂糠醛，则溶液的相对挥发度发生显著的变化。 [1]
在原有超临界流体萃取设备精馏系统基础上，完成了超临界流体连续逆流萃取系统的改造，并成功地进行了大蒜油连续逆流萃取研究。
On the base of rectify system of the original supercritical fluid extraction device, equipment modification for CC-SFE were accomplished and garlic oil extraction by using CC-SFE was studied.
以藜芦醛为主要原料、异丙醇为溶剂，经硼氢化钠还原、溶剂萃取、减压精馏得到产物藜芦醇。
Veratryl alcohol was synthesized through the reduction of sodium borohydride from veratraldehyde with isopropanol as solvent, followed by solvent extraction and distillation under reduced pressure.
加恒沸剂共沸蒸馏和乙酸萃取反应精馏过程。 乙醛缩合法生产乙酸乙酯的三塔连续精馏过程以及乙烯与乙酸气相催化反应的加水精制工艺过程。
Three-tower continuous distillation process of ethyl acetate from aldehyde condensation and purification by gas-phase oxidation of acetic acid and ethylene were also discussed.
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