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Method for preparing porous separation membrane

A technology of porous separation membrane and membrane casting solution, which is applied in the direction of semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of difficulty in preparing nanofiltration and below membranes, poor fluidity, restrictions, etc., and achieve benefits for large-scale Large-scale production, low cost, and controllable effects

Active Publication Date: 2014-06-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for most membrane materials (such as polyvinylidene fluoride, polyether ether ketone, polysulfone, polyacrylonitrile, polyimide), it is relatively easy to prepare microfiltration membranes by immersion precipitation phase inversion, while preparation Nanofiltration and below membranes are more difficult
Because for most membrane materials, increasing the concentration of the casting solution is the only way to reduce the pore size, but when the concentration of the casting solution is too high, its fluidity is too poor and it is difficult to coat and form a film
This limits the preparation of porous membranes of nanometer size and below by the immersion precipitation phase inversion method.

Method used

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  • Method for preparing porous separation membrane
  • Method for preparing porous separation membrane
  • Method for preparing porous separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1.8 grams of polyvinylidene fluoride with a molecular weight of 50,000 was dissolved in a mixed solvent of 5 ml DMAC and 5 ml sulfolane, stirred for 12 hours, and the formed polymer solution was spread on a glass plate to form a liquid film. Volatilize the liquid film together with the glass plate on a hot stage at 30°C for 2 hours to remove DMAC. Then the liquid membrane was quickly immersed in 5L of water, and solidified in about 1 minute to form a porous separation membrane. The structure of the membrane is a typical asymmetric porous membrane, which is composed of a dense skin layer and a macroporous support layer. The pore size of the membrane skin is about 8-10nm, the porosity is 70%, and the thickness is 70 microns. The macroporous support layer is 120 microns thick, with an average pore size of 5 microns and a porosity of 80%.

[0029] The all-vanadium redox flow battery is assembled by using the prepared porous separation membrane, the activated carbon felt i...

Embodiment 2

[0031] Dissolve 2.1 g of polyacrylonitrile in 3 ml of DMAC and 3 ml of sulfolane, stir for 12 hours, spread the resulting polymer solution on a glass plate to form a liquid film, and volatilize the liquid film together with the glass plate on a hot stage at 30°C for 2 hours to remove DMAC. Then quickly immersed in 5L of water to solidify to form a porous separation membrane. The pore size of the membrane skin is about 40nm, the porosity is 80%, and the thickness is 60 microns.

[0032] The all-vanadium redox flow battery is assembled by using the prepared porous separation membrane, the activated carbon felt is the catalytic layer, the graphite plate is the bipolar plate, and the effective area of ​​the membrane is 9cm -2 , with a current density of 80mA cm -2 , the vanadium ion concentration in the electrolyte is 1.50mol L -1 , H 2 SO 4 The concentration is 3mol L -1 . The assembled flow battery has a current efficiency of 96.1%, a voltage efficiency of 88.2%, and an en...

Embodiment 3

[0034] Dissolve 2.3 grams of polysulfone and 0.7 grams of sulfonated polyetheretherketone in 10ml of DMAC, stir for 12 hours, spread the formed polymer solution on a glass plate, and volatilize the liquid film together with the glass plate on a hot stage at 30°C for 2 hours. DMAC. Then quickly immersed in 5L of water, solidified, forming a porous separation membrane. The pore size of the membrane skin is about 30nm, the porosity is 80%, and the thickness is 80 microns.

[0035] The all-vanadium redox flow battery is assembled by using the prepared porous separation membrane, the activated carbon felt is the catalytic layer, the graphite plate is the bipolar plate, and the effective area of ​​the membrane is 9cm -2 , with a current density of 160-40mA cm -2 , the vanadium ion concentration in the electrolyte is 1.50mol L -1 , H 2 SO 4 The concentration is 3mol L -1 . The current efficiency of the assembled flow battery is as follows image 3 shown.

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Abstract

The invention relates to a method for preparing a porous separation membrane. The invention also relates to a redox flow energy storage battery comprising the porous polymer separation membrane disclosed by the invention, and particularity relates to a vanadium redox flow battery. A membrane material is simple in preparation method, good in chemical stability, and good in aperture controllability, and can be easily produced in the large scale. By using the prepared membrane material, the separation of different ions can be effectively achieved, and the ion selectivity of the membrane is kept. By adopting the method, the concentration range of a casting membrane solution is widened, the capacity of regulating and controlling the membrane structure through the concentration of the casting membrane solution is expanded, and the method is applicable to application of all membrane structures which are adjusted through the concentration of the casting membrane solution.

Description

technical field [0001] The invention relates to a preparation method of high-concentration casting liquid and the application of the porous separation membrane prepared by immersion precipitation phase inversion method in liquid flow energy storage battery Background technique [0002] The preparation of porous membranes by immersion precipitation phase inversion technology has important applications in various industrial fields. In the preparation process of porous membranes, the membrane pore size and pore structure have a crucial impact on the performance. There are many ways to control parameters such as pore size and pore structure, including the choice of solvent / non-solvent system, adding pore-forming agents to the casting solution, adding volatile solvents, and adjusting film-forming conditions. Through the regulation of the pore size, the continuous transformation of the membrane pores from the micrometer scale to the nanometer scale and finally to the dense nonporo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/06B01D71/68B01D71/52B01D71/56B01D71/38B01D71/26B01D71/28B01D71/34B01D71/62B01D71/78B01D67/00H01M2/14H01M50/403H01M50/491
CPCY02E60/10
Inventor 张华民张洪章李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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