Defoaming device and process for preparing ultrafiltration membranes

Abstract

The invention discloses a defoaming device and process for preparing ultrafiltration membranes. The defoaming device for preparing the ultrafiltration membranes comprises a first defoaming chamber andis characterized in that the upper end of the first defoaming chamber is provided with a vacuum pump connector and a feeding port; the vacuum pump connector penetrates through the first defoaming chamber; the feeding port comprises a first feeding pipe and a second feeding pipe, and the first feeding pipe is fixed at the upper end of the first defoaming chamber and penetrates through the first defoaming chamber; the bottom end of the first deforming chamber is provided with a second defoaming chamber, and a second umbrella-shaped defoamer penetrates through the second defoaming chamber. The defoaming process mainly comprises primary defoaming by umbrella-shaped defoamers and heated and stirred vacuum defoaming. The invention aims at providing the defoaming device and process for preparingthe ultrafiltration membranes. The defoaming device can defoam high-molecular polymers through an umbrella-shaped defoaming manner and a stirred defoaming manner, and a multi-stage defoaming manner can remove foams of the polymers within one step and accordingly can significantly improve the defoaming efficiency.

Description

technical field [0001] The invention relates to a defoaming device, in particular to a defoaming device for preparing an ultrafiltration membrane and a defoaming process thereof. Background technique [0002] Ultrafiltration membrane is a microporous filtration membrane with uniform pore size and rated pore size range of 0.1-0.02 microns. Appropriate pressure is applied to one side of the membrane to screen out solute molecules smaller than the pore size to separate particles with a molecular weight greater than 5 Daltons and a particle size greater than 2 to 20 nanometers. The ultrafiltration membrane is one of the earliest developed polymer separation membranes, and the ultrafiltration device was industrialized in the 1960s. The industrial application of ultrafiltration membrane is very extensive, and it has become one of the new chemical unit operations. It is mainly used in the separation, concentration, purification of biological products, pharmaceutical products and f...

AI Technical Summary

Problems solved by technology

Due to the high viscosity of high molecular polymers, generally 1500-3500 centipoise, the production efficiency of the existing defoaming method is very low, the defoaming is not clean, and the membrane filaments will break or leak during the spinning process. Phenomenon, which makes the pore size in the molding uneven, and some ultrafiltration membranes appear to be broken.

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