Solid-liquid separation is an indispensable chemical unit operation for many industrial productions. There are three types of materials in production: easy-to-filter liquid, hard-to-filter liquid and ultra-fine liquid.
Easy to filter material liquid: The solid particles are rigid and larger than 10 μm. It can be solved by the traditional filtering technology using filter cloth as the filtering medium.
Ultrafine material liquid: the solid particle size is between 0.5μm and 0.01μm, and the solid concentration is less than 5-10 mg/L. The filtration of ultrafine filter material can be solved by using ultrafiltration membrane technology.
Difficult to filter material liquid: the particle size of solid particles is between 10μm and 0.5 μm; or the particles are larger than 10 μm, but the particles are not rigid and easily deformed, the viscosity between the particles and the filter medium is large, and the solid concentration is greater than 5 to 10 mg/L. This kind of material is currently the most difficult to handle in industrial production, and often becomes a weak link in industrial production, which seriously affects product quality, efficiency, cost and labor productivity.
The following mainly describes the main research results in microporous PE / PA-based precision microporous technology.
I. Main Features
- The filtration accuracy is very high. Generally, one-time filtration of 0.5 micron particles can be achieved, and the filtrate is very clear, which cannot be achieved by any filtration technology using filter cloth and filter felt as media.
- It is not only suitable for clarification filtration with very little solid content, but also for “filtration residue filtration” with high solid content, which can form a residue layer. Not only can the filter slag be conveniently discharged, but also the dry slag can be easily discharged, which is currently unattainable with the current microporous membrane and ultrafiltration membrane technology.