Explanation

It is an intermediate phase liquid that separates two mutually insoluble liquids. It is a bridge for material transfer between two phases, enabling solutes in two phase solutions to selectively penetrate, leading to the separation of solutes. According to its shape, it can be divided into two categories: milky and supportive. The emulsion is composed of three substances: carrier, membrane solvent, and surfactant. A carrier is a substance that can undergo chemical reactions with the separated solute and transport the solute through it; The membrane solvent is the matrix of the membrane liquid phase, accounting for more than 90% of the membrane capacity. When the feed liquid is an aqueous solution, it is used as an organic solvent, and when the feed liquid is an organic solvent, it is used as water; The stability, penetration rate, separation effect, and demulsification affected by surfactants. The supporting membrane is composed of a support body and a membrane phase. The supports are mainly microporous polypropylene, polylctrafluorocthylone, etc., which are made into flat, tubular, spiral and hollow fiber membrane modules. The membrane phase is composed of carrier and diluents. There are three mechanisms of separation. Different solutes have different water solubility and diffusion coefficient in order to achieve selective osmotic separation of solutes; The separation of solutes is realized by the extraction mechanism of forming complexes in the membrane phase between the carrier and the external solute ions; Promote the diffusion of the solute to the phase in the membrane by using the non inverse chemical reaction between the substance in the membrane phase and a solute in the solute to be separated; The liquid membrane technology is widely used in oil production increase, precious metal recovery, wastewater treatment and other aspects.

Classification