Compound physical field reinforced membrane separation process

A separation process and membrane strengthening technology, applied in the field of membrane separation, to achieve the effect of improving membrane retention rate, high separation efficiency, and inhibiting membrane flux attenuation

Inactive Publication Date: 2007-07-11
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for reducing concentration polarization and membrane fouling and improving membrane separation for the problems of membrane fouling and concentration polarization in the multi-component polysaccharide membrane separation process that urgently need to be solved in the food, biochemical and other industries. The composite physical field of the performance strengthens the membrane separation method in order to prolong the service life of the membrane and strengthen the membrane separation process

Method used

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  • Compound physical field reinforced membrane separation process
  • Compound physical field reinforced membrane separation process
  • Compound physical field reinforced membrane separation process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Stir the treatment solution at a speed of 60 rpm, the treatment solution is mucopolysaccharide w=0.5%, and keep the temperature at 30° C. for 30 minutes;

[0038] (2) Fully open the ultrafiltration backflow valve, start the peristaltic pump, the flow rate of the treatment liquid is 300mL / min and reach a constant value, and make the pressure difference between the inside and outside of the ultrafiltration membrane zero, even if the whole system reaches a full backflow state;

[0039] (3) Slowly close the backflow valve to gradually increase the pressure difference between the inlet and outlet of the membrane separation system to 0.1MPa, and maintain a constant pressure difference between the inside and outside of the membrane;

[0040] (4) In the dynamic membrane separation system, applying an electric field strength of 100V / cm to a DC electric field and a power of 100W and an ultrasonic field with a frequency of 40KHz selects the negatively charged sodium polyacrylat...

Embodiment 2

[0054] Influence of Compound Physical Fields on Membrane Flux Decay

[0055] The degree of membrane flux attenuation (m) refers to the decrease in membrane flux over time due to concentration polarization, membrane compaction, and membrane pore clogging during the ultrafiltration process. By measuring the pure water membrane flux J before and after the membrane treatment solution o and J t Calculated, it can be expressed by the following formula:

[0056] m = J o - J t J o × 100 %

[0057] Using PES300 membrane and charged PES300 membrane, under the conditions of 0.2MPa, flow rate of 300mL / min, and electric field strength of 100V / cm, the separation experiment of 0.5% dextran sulfate was carried out respectively, and the combined effects of...

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Abstract

The invention relates to a method for separating the strengthen film in composite physical field, wherein it comprises that: mixing treating liquid, opening the ultra-filter reflux valve fully, starting the worm pump, making the inner and outer pressure difference of ultra-filter film as zero, to form the film separate system with full reflux state; slowly closing the reflux valve, increasing the entrance pressure to 0.05-0.3MPa, holding the inner-outer pressure difference of film; functioning direct-current electric field and ultrasonic filed in the film separating system. The invention can reduce film pollution, improve separating efficiency and prolong the service life of film.

Description

technical field [0001] The invention relates to a membrane separation method, in particular to a method for strengthening the membrane separation process with a composite physical field. Background technique [0002] Separation and purification technology is an indispensable and important link in industries such as medicine, food, and chemical industry, and the separation process is a multi-step, high-energy-consuming, and low-efficiency process. Among the factors affecting the price of biochemical products, the separation process is the first to bear the brunt, and its cost usually accounts for 50-70% of the production cost, and some even as high as 90%. Membrane separation technology has been internationally recognized as the most promising high-tech in the 21st century, and even led to an industrial revolution. As a membrane separation technology, due to the advantages of high separation efficiency, low energy consumption, and easy operation, it has been widely used in f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/00B01D65/08
Inventor 肖凯军郭祀远陈健蔡妙颜王兆梅
Owner SOUTH CHINA UNIV OF TECH
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