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一、概述 萃取也称溶剂萃取或液液萃取,又称抽提,它是分离和提纯物质的重要单元操作之一。它的分离方法是加入一种与原溶液不相混溶的适当溶剂,利用原溶液中的各组分在此溶剂中的不同溶解度,使其中欲分离的组分溶解于溶剂中,而达到与其它组分分离的目的。可以看出,萃取操作有如下的特点: 1.所处理的物料是液相混合物。 2.由于加入另一不相互溶的溶剂,使系统成为不互溶的两个液相,且系统中至少存在着三个组分。 所以萃取过程涉及到两个液相间的热力
First, an overview of extraction Solvent extraction or liquid-liquid extraction, also known as extraction, it is one of the important unit operation of the separation and purification of substances. Its separation method is to add a suitable immiscible solvent with the original solution, the use of the original solution of the various components of the different solubility in the solvent, which would like to separate the components dissolved in the solvent to achieve and The purpose of separation of other components. It can be seen that the extraction operation has the following characteristics: 1. The material to be treated is a liquid mixture. 2. Due to the addition of another immiscible solvent, the system becomes immiscible two liquid phases, and there are at least three components in the system. So the extraction process involves the heat between the two liquid phases