What is the working pressure of the hollow fiber ultrafiltration membrane?

Release Date:

2020-09-15

Author:

Abstract:

When choosing the working environment pressure of the hollow fiber ultrafiltration membrane, in addition to the compressive strength of the membrane and the shell, the compactness of the membrane and the pollution resistance of the membrane should also be considered. The higher the pressure, the greater the influence of the water permeability. At this time, the more trapped substances form and accumulate on the surface of the membrane, the greater the resistance coefficient, which will cause the attenuation of the water permeability. In addition, the particles entering the pores of the membrane are also prone to block the development channels.
The pressure range of the hollow fiber ultrafiltration membrane is 0.1～0.6MPa, which refers to the pressure used by the standard solution system within the definition of ultrafiltration. To separate substances of different molecular weights, we choose ultrafiltration membranes with corresponding molecular weight cut-offs, and the effect of operating pressure will be different. Generally, the plastic shell hollow fiber internal pressure film, the shell compressive strength is obviously less than 0.3MPa.
 
The pressure strength design of the hollow fiber ultrafiltration membrane is generally lower than 0.3MPa, so the staff pressure should be lower than 0.2MPa, and the pressure difference between the two sides of the membrane should not be greater than 0.1MPa. It can be seen that because the internal pressure film has a large diameter, if it is used as an external pressure film, it is often easy to squash and cut off at the bonding site, causing serious damage, so the company's internal and external pressure film cannot be used as a general purpose.
 
The hollow fiber ultrafiltration membrane needs a suitable time to use a certain pressure ultrafiltration fluid in the next step. It should be a stainless steel shell ultrafiltration membrane. The hollow fiber ultrafiltration membrane is used at a pressure of 0.6 MPa, and the pressure is upward to provide ultrafiltration. The filtrate is 30 meters of water column, that is, the pressure of 0.3MPa, but the pressure of the hollow fiber membrane inside and outside must be kept not greater than 0.3MPa.
 
When choosing the working environment pressure of the hollow fiber ultrafiltration membrane, in addition to the compressive strength of the membrane and the shell, the compactness of the membrane and the pollution resistance of the membrane should also be considered. The higher the pressure, the greater the influence of the water permeability. At this time, the more trapped substances form and accumulate on the surface of the membrane, the greater the resistance coefficient, which will cause the attenuation of water permeability. In addition, the particles entering the pores of the membrane are also prone to block the development channels.
 

Keywords:

Previous article:

None

Next article:

How to clean the hollow fiber ultrafiltration membrane?

Recommended Reading

A customer in Zhejiang

一、Hollow fiber ultrafiltration membrane spinning production line: the equipment is suitable for the hollow fiber ultrafiltration membrane production of PVC, PAN, PVDF, PS, PE and other materials, according to the technical requirements of customers to provide professional one-to-one connection, tailored for customers to design and manufacture specific production lines

2020-09-24

A customer in Shandong

Coagulation tank: with automatic adjustment of spinning process. Online detection of the organic solvent concentration of the coagulation bath water and real-time adjustment to achieve stable spinning conditions to ensure the quality of the film. Passive wire pressing lifts and lowers the wire guide wheel to increase the curing stroke and time of the film wire.

2020-09-24

How long can the hollow fiber ultrafiltration membrane last?

How long is the service life of the hollow fiber ultrafiltration membrane? The normal service life can reach 5 years or even 8 years. The service life of the membrane is closely related to the cleaning and maintenance of the membrane during use. The membrane can always maintain a good flux, thereby improving production efficiency, naturally extending the service life of the membrane, and reducing the frequency of membrane replacement.

2020-09-15