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Ion exchange membrane with high current efficiency, and preparation method and application thereof

An ion-exchange membrane and high-current technology, applied in the field of ion-exchange membranes, can solve the problems of high tank pressure and complex ion-exchange membrane preparation process, and achieve the effects of low cost, improvement of peeling defects, and improvement of selectivity

Active Publication Date: 2014-02-12
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Patent CN 1062382A discloses a fluorine-containing cation exchange membrane, which is used in electrolysis and is suitable for preparing alkali metal hydroxides under the operating conditions of high lye concentration and high current density, but the preparation process of the ionic membrane is relatively Complicated, and it can be found from the examples that the cell pressure generated by the ion membrane during the electrolysis process is relatively high

Method used

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  • Ion exchange membrane with high current efficiency, and preparation method and application thereof
  • Ion exchange membrane with high current efficiency, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041]The short-chain perfluorosulfonic acid resin (A layer raw material) of IEC=1.12mmol / g (x=4.5, n=0, m=3 in the general formula), the long-chain perfluorosulfonic acid of IEC=0.85mmol / g Resin (B layer raw material) (x=7.3, n=1, m=3) and IEC=1.20mmol / g long-chain perfluorocarboxylic acid resin (C layer raw material) (x=3.9, n=1, m= 3) According to a certain ratio, it is composited into a film by co-extrusion casting, wherein the thickness of the A layer is 100 microns, the thickness of the B layer is 10 microns, and the thickness of the C layer is 8 microns; then, the PFA fiber web (thickness 65 microns) The A layer (80% of the thickness of the PFA fiber web is embedded in the A layer) of the three-layer composite membrane is compounded by a hot pressing process (temperature 150°C) to form a reinforced ionic membrane, and the composite ionic membrane is hydrolyzed in 25wt% KOH aqueous solution at 90°C 10-15 hours for transformation treatment, and then ZrO containing 3-5wt% ...

Embodiment 2

[0043] The ionic membrane with high current efficiency in the chlor-alkali tank as described in embodiment 1, difference is to adopt the short-chain perfluorinated sulfonic acid resin (A layer raw material) (x=3.5, n=of IEC=1.26mmol / g) 0, m=2), IEC=0.77mmol / g long-chain perfluorosulfonic acid resin (B layer material) (x=8.5, n=1, m=4) and IEC=1.00mmol / g short-chain perfluorosulfonic acid resin Fluorocarboxylic acid resin (material for layer C) (x=5.5, n=0, m=3). Among them, the thickness of layer A is 120 microns, the thickness of layer B is 10 microns, and the thickness of layer C is 6 microns; then, the polytetrafluoroethylene fiber mesh (thickness 70 microns) is composited into a three-layer composite by hot pressing (temperature 120 °C) The A layer of membrane (90% embedding A layer of polytetrafluoroethylene fibrous web thickness) forms reinforced ionic membrane, and after this composite ionic membrane is described in embodiment 1 transformation, after hydrophilic coating...

Embodiment 3

[0045] The ionic membrane with high current efficiency in the chlor-alkali tank as described in embodiment 1, difference is to adopt the short-chain perfluorinated sulfonic acid resin (A layer raw material) (x=3.0, n=of IEC=1.35mmol / g) 0, m=5), IEC=0.95mmol / g long-chain perfluorosulfonic acid resin (B layer raw material) (x=6.1, n=1, m=2) and IEC=1.18mmol / g long-chain perfluorosulfonic acid resin Fluorocarboxylic acid resin (raw material for layer C) (x=4.0, n=1, m=3). Among them, the thickness of layer A is 100 microns, the thickness of layer B is 20 microns, and the thickness of layer C is 10 microns; then, the polyperfluoroethylene propylene fiber mesh (thickness 55 microns) is composited into three layers by hot pressing (temperature 140 °C) The A layer of the composite membrane (the full thickness of the polyperfluoroethylene propylene fiber net is embedded in the A layer) forms a reinforced ionic membrane. After the composite ionic membrane is transformed and treated wit...

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Abstract

The invention relates to an ion exchange membrane with high current efficiency, and a preparation method thereof, and application of the ion exchange membrane to preparation of caustic soda in a chlor-alkali tank, and belongs to a compound membrane for producing alkali metal hydroxides and chlorine simultaneously in an ion membrane electrolytic tank. The ion exchange membrane with high current efficiency is characterized by being formed by compounding three layers of perfluorinated ion exchange resin base membranes and a reinforcing material; the three layers of perfluorinated ion exchange resin base membranes are sequentially a high-exchange-capacity sulfonic acid layer, a low-exchange-capacity sulfonic acid layer and a high-exchange-capacity carboxylic acid layer; and the reinforcing material is compounded on one side near the high-exchange-capacity sulfonic acid layer. The invention provides the ion exchange membrane which is high in current efficiency, mechanical strength and chemical stability, suitable for high and low alkali liquor concentration, and low in cost; the preparation method is simple; and in an electrolytic process, the electrolytic tank always keeps high current efficiency and low tank pressure; and products hydroxides have few impurities and are high in purity.

Description

technical field [0001] The present invention is an ion exchange membrane with high current efficiency in a chlor-alkali electrolyzer. It belongs to the composite membrane used for the simultaneous production of alkali metal hydroxide and chlorine gas in ion-exchange membrane electrolyzers. Background technique [0002] Ionic membrane soda production is currently the most advanced and economically reasonable caustic soda production method. Improving the current efficiency of the electrolytic cell in the process of ion membrane alkali production is one of the common research topics of ion membrane manufacturers and alkali production enterprises. [0003] There are many factors that affect the current efficiency of an ion-exchange membrane electrolyzer, such as: the exchange capacity, structure, and thickness of the ion-exchange membrane itself; the operating temperature and current density of the electrolyzer; the impurity content in the brine, the concentration of sodium chl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08C25B1/46C25B9/10C25B9/23
Inventor 王婧张永明张恒赵宽宗少杰
Owner SHANDONG DONGYUE POLYMER MATERIAL
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