An electric field enhanced fast membrane concentration method and device

A membrane concentration and rapid technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., to achieve rapid concentration, simple process and operation, and improve concentration efficiency.

Active Publication Date: 2012-02-22
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Method used

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  • An electric field enhanced fast membrane concentration method and device
  • An electric field enhanced fast membrane concentration method and device
  • An electric field enhanced fast membrane concentration method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] use figure 1 The fast membrane concentration device under the electric field conditions shown includes: flat membrane module 1, filter membrane 2, pressure sensor 3, feed pump 4, electrolyte circulation pump 5, electrode 6, flow regulating valve 7, isolation membrane 8 ;Electrolyte storage tank 9

[0039] In the flat membrane module 1 (the effective membrane area is 45cm 2 ) is equipped with a flat filter membrane 2 in the middle, and the filter membrane is selected as a PS polysulfone ultrafiltration membrane (Alfa Laval Company of Denmark) with a molecular weight cut-off (MWCO) of 100kDa. Titanium (ruthenium-plated) electrode 6; two isolation membranes 8 are sandwiched between the electrode and the feed solution, the cut-off molecular weight is 3500Da, the space between the isolation membrane 8 and the electrode 6 is the electrolyte circulation chamber, and the electrolyte circulates in the electrolyte Under the action of the pump 5, it circulates between the upper ...

Embodiment 2

[0043] The same apparatus and method as in Example 1 were used.

[0044] A solution of bovine serum albumin (BSA) (Mb=68kDa, purity greater than 98%) with a fixed volume (400mL) and a concentration of 1.0g / L is delivered to the above-mentioned membrane module through a feed pump, and the transmembrane pressure of the filter membrane is 0.04MPa , the cross-flow velocity of the feed liquid flowing through the membrane surface is 0.03m / s, and the pH value of the feed liquid is adjusted to about 8; the electrode is connected to an external DC power supply, and the electric field strength is adjusted to 30V / cm; the feed liquid cross-flows through the membrane The components are then returned to the feeding system for recycling; the permeate permeated through the membrane is continuously discharged and collected from the permeate outlet below the filter membrane. When the accumulated permeate reaches 200mL, the operation is stopped, the concentration time is recorded, and respectivel...

Embodiment 3

[0047] Using the same device and method as in Example 1, the filter membrane used is a 30 kDa PES polysulfone ultrafiltration membrane.

[0048] The lysozyme (Mb=14kD, purity greater than 98%) solution with a fixed volume of 400mL and a concentration of 1.0g / L is delivered to the above-mentioned membrane module through a feed pump, the transmembrane pressure of the filter membrane is 0.04MPa, and the feed liquid flows through The cross-flow velocity of the membrane surface is 0.03m / s, and the pH value of the feed liquid is adjusted to about 8; the electrode is connected to an external DC power supply, and the electric field strength is adjusted to 50V / cm; the feed liquid cross-flow passes through the membrane module and returns to the inlet In the material system, it is recycled; the permeate that permeates the membrane is continuously discharged and collected from the permeate outlet below the filter membrane. When the permeate accumulation reaches 200mL, stop the operation, r...

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Abstract

The invention relates to an electric field enhanced fast membrane concentration method and device, which relates to a method and a device for concentrating charged solute molecules, colloid molecules and particles in a solution by using membrane technology. Select a filter membrane with a molecular weight cut-off greater than that of the solute molecule or a pore size greater than the diameter of the particles. By applying a direct current electric field, the molecules or particles will undergo electrophoretic movement away from the membrane surface to improve the retention rate of the solute molecules and particles on the separation side of the membrane, while the solvent will penetrate quickly. Through the membrane, the rapid concentration of solute molecules or particles is realized. Compared with the conventional membrane concentration process, the invention can greatly reduce the concentration time, improve the concentration efficiency, significantly reduce the membrane pollution, and increase the service life of the membrane.

Description

technical field [0001] The invention relates to a method and device for concentration using membrane technology, in particular to a membrane filtration method and device for improving the flux and retention rate of the membrane process through the selection of an external electric field and a filter membrane, thereby realizing rapid and high-efficiency concentration. Background technique [0002] Membrane separation technology has received extensive attention in recent years due to its green and pollution-free process, low energy consumption, and high separation efficiency. In the process of concentration using membrane technology, the processed solution is pushed by the pressure difference, the solvent and small molecular substances flow out through the membrane pores, and the suspended particles, colloid molecules and solute macromolecules are trapped in the main solution, thus Concentration of the target substance is achieved. The main factors affecting the concentration...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D57/02B01D61/14
Inventor 万印华宋伟杰苏仪陈向荣沈飞
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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