Ion exchange membrane with high impurity tolerance

A technology of ion exchange membrane and tolerance, applied in the field of ion membrane, can solve the problems of impurity retention, electrolysis voltage rise, difficult to remove, etc., and achieve the effect of maintaining stability, high current efficiency, and high impurity tolerance

Inactive Publication Date: 2010-12-29
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, even if the brine is refined, there are still impurities remaining, which are difficult to be completely removed effectively, and are often mixed into the brine at a relatively high concentration, so that the current efficiency of the ion exchange membrane is greatly reduced, and the electrolysis voltage is significantly increased.
[0004] Chinese patent document CN 1993409A (200580025733.X) provides a fluorine-containing ion exchange membrane, which can stably exhibit high current efficiency in the electrolysis of chlor-alkali solution containing impurities; but the membrane is mainly aimed at organic impurities , there is no obvious advantage in the resistance to inorganic impurities

Method used

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  • Ion exchange membrane with high impurity tolerance
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  • Ion exchange membrane with high impurity tolerance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Water and ethanol are formulated into a mixed solution according to a weight ratio of 1:1, and then the structure is:

[0036]

[0037] Among them, (a+b) / (a+b+c+d)=0.65; (c+d) / (a+b+c+d)=0.35

[0038] The fluorine-containing sulfonic acid resin is dissolved into the water-alcohol mixture to form a sulfonic acid resin solution with a concentration of 2wt%; then zirconia particles with an average particle size of 0.2 microns are added to the above solution, and they are homogenized in a ball mill to form A dispersion with a content of 17% by weight. Using the method of spraying, the dispersion liquid is attached to the surface of both sides of the sulfonic acid / carboxylic acid composite membrane reinforced with grid cloth with a thickness of 110 microns. After drying, a discontinuous porous gas release layer with a porosity of 84% is formed. The distribution of zirconium particles on the surface of the composite film is 7.6mg / cm 2 .

[0039] The above membrane was im...

Embodiment 2

[0048] Water and ethanol are formulated into a mixed solution according to a weight ratio of 1:1, and then the structure is:

[0049]

[0050] Among them, (a+b) / (a+b+c+d)=0.86; (c+d) / (a+b+c+d)=0.14;

[0051] The fluorine-containing sulfonic acid resin is dissolved into the water-alcohol mixture to form a sulfonic acid resin solution with a concentration of 10%; then silicon oxide particles with an average particle size of 0.3 microns are added to the above solution, and they are homogenized in a ball mill to form 14% by weight dispersion. Using the method of roller coating, the dispersion liquid is attached to the surface of both sides of the sulfonic acid / sulfonic acid composite membrane reinforced by non-woven fabric with a thickness of 110 microns, and a discontinuous porous gas release layer with a porosity of 66% is formed after drying. The distribution of silicon oxide particles on the surface of the composite film is 5.7mg / cm 2 .

[0052] Using the same method as in...

Embodiment 3

[0056] Water and ethanol are formulated into a mixed solution according to a weight ratio of 1:1, and then the structure is:

[0057]

[0058] Among them, (a+b) / (a+b+c+d)=0.77; (c+d) / (a+b+c+d)=0.23;

[0059] The fluorine-containing sulfonic acid resin is dissolved into the water-alcohol mixture to form a sulfonic acid resin solution with a concentration of 0.5%; then tin oxide particles with an average particle diameter of 0.2 microns are added to the above solution, and are homogenized in a ball mill to form 8% by weight dispersion. Using the method of brushing, the dispersion liquid is attached to the cathode side surface of the fiber-reinforced sulfonic acid / sulfonic acid carboxylic acid copolymer / carboxylic acid composite membrane with a thickness of 110 microns, and after drying, a non-woven fabric with a porosity of 90% is formed. Continuous porous gas release layer, the distribution of tin oxide particles on the surface of the composite film is 3mg / cm 2 .

[0060]...

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Abstract

The invention relates to an ion exchange membrane with high impurity tolerance, which comprises a layer of fluorine-containing polymer film, wherein at least one layer of the fluorine-containing polymer film is adhered with a no-polarized porous gas releasing layer, and the gas releasing layer is formed by drying the surface of the polymer film which is adhered with dispersion liquid, wherein thedispersion liquid is formed by dispersing organic or inorganic grains in metal ion-containing sulfoacid resin hydroalcoholic solution. The ion exchange membrane is used for chlor-alkali industry to be stably and effectively process alkali metal chloride solution which contains high content of impurity.

Description

technical field [0001] The invention relates to an ion exchange membrane with high impurity tolerance and belongs to the technical field of ion membranes. Background technique [0002] Ionic membrane electrolysis technology is an epoch-making electrolytic alkali production technology developed in the 1970s. Compared with the traditional mercury method and diaphragm method, it has outstanding advantages such as low energy consumption, high product quality, no pollution, less investment, and saving floor space. It has been recognized by the world as the most advanced and economically most reasonable caustic soda The production method is the development direction of today's electrolytic caustic soda production technology. [0003] However, the ionic membrane has a relatively prominent disadvantage, that is, the purity of the raw brine is extremely high. In the chlor-alkali electrolysis industry, in order to maintain good working performance for a long time, it is very importa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/32B01D69/12B01D67/00C08J5/22C25B13/00C25B1/46
Inventor 王婧张永明张恒
Owner SHANDONG DONGYUE POLYMER MATERIAL
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