A kind of ultrafiltration method of automatic ultrafiltration system under linear transmembrane pressure

Abstract

The invention discloses an ultrafiltration method for an automatic ultra-filtering system under linear trans-membrane pressure. The method comprises the following steps: (1) setting a trans-membrane pressure value, initial flow, and operating time at the starting and ending points through a PLC controller, operating the ultra-filtering system at the initial flow, enabling the opening degree of a shutoff valve to be 100%, and pumping a sample solution to be ultra-filtered into the ultra-filtering system through a diaphragm pump, and enabling the whole system automatically to be fully filled with the sample solution; (2) keeping the constant flow of the ultra-filtering system unchanged, reducing the opening degree of the shutoff value, and increasing the trans-membrane pressure gradually to reach the trans-membrane pressure at the starting point set by the system; (3) changing the opening degree of the shutoff valve to achieve the liner change of the trans-membrane pressure value, continually operating the system to reach the trans-membrane pressure value at the ending point; (4) collecting the filtrate through a filtrate collecting container, performing cyclic ultra-filtering on the back-flow sample solution, and collecting the concentrated solution continually or batch by batch. The linear trans-membrane pressure of the ultra-filtering system is achieved, and the penetration rate of a sample membrane, the sample yield, and the ultra-filtering efficiency are improved.

Description

technical field [0001] The invention relates to an ultrafiltration system, in particular to an ultrafiltration method of an automatic ultrafiltration system under linear transmembrane pressure. Background technique [0002] Ultrafiltration is a membrane separation process that uses sieving as the separation principle and pressure as the driving force. The filtration accuracy is in the range of 0.005-0.01 μm, which can effectively remove particles, colloids, bacteria, heat sources and high-molecular organic substances in water. It can be widely used in the separation, concentration and purification of substances. The current ultrafiltration system cannot automatically adjust the transmembrane pressure and flow, and cannot achieve the most reasonable ultrafiltration conditions. The membrane permeability and sample yield are low, and the ultrafiltration efficiency is low. Contents of the invention [0003] In order to solve the above technical problems, the object of the pre...

AI Technical Summary

Problems solved by technology

The current ultrafiltration system cannot automatically adjust the transmembrane pressure and flow, and cannot achieve the most reasonable ultrafiltration conditions. The membrane permeability and sample yield are low, and the ultrafiltration efficiency is low.

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