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Ion exchange membrane for superhigh-current-density oxygen cathode electrolysis and preparation method thereof

A technology of ion exchange membrane and current density, which is applied in the field of polymer materials and electrochemistry, can solve the problems of increasing reaction resistance, reducing catalytic efficiency, and having no catalytic function, so as to improve mechanical strength, increase electrochemical flux, and realize functions. Effect

Active Publication Date: 2014-02-05
SHANDONG DONGYUE POLYMER MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the traditional chlor-alkali ion membrane is used in the oxygen cathode chlor-alkali process, there are some insurmountable defects: since the membrane itself has no catalytic function, oxygen will not react on the surface of the ion membrane even if it is fully contacted, but can only The catalytic electrode surface and accessories of the cell react, which increases the reaction resistance to a certain extent, increases the cell voltage and reduces the catalytic efficiency at the same time

Method used

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  • Ion exchange membrane for superhigh-current-density oxygen cathode electrolysis and preparation method thereof
  • Ion exchange membrane for superhigh-current-density oxygen cathode electrolysis and preparation method thereof
  • Ion exchange membrane for superhigh-current-density oxygen cathode electrolysis and preparation method thereof

Examples

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Effect test

Embodiment 1

[0054] (1) Preparation of resin pellets

[0055] The perfluorosulfonic acid resin used is the powder obtained by in-situ polymerization of tetrafluoroethylene and perfluoro 3,6-dioxa-4-methyl-7-octenesulfonyl fluoride in the presence of carbon nanotubes. The capacity is 0.99mmol / g. The carbon nanotubes are (6,6) single-walled tubes with a length of 5-15 microns and a mass content of 4.5%. The perfluorocarboxylic acid resin used is a powder obtained by copolymerization of tetrafluoroethylene and perfluoro 4,7-dioxa-5methyl-8-nonenoic acid methyl ester, and the ion exchange capacity is 0.95mmol / g.

[0056] The above-mentioned carbon nanotube-containing perfluorosulfonic acid resin powder and perfluorocarboxylic acid resin powder are melt-extruded and granulated to obtain respective resin masterbatch pellets.

[0057] (2) Membrane preparation and reinforcement

[0058] Using the above-mentioned perfluorocarboxylic acid resin pellets and perfluorosulfonic acid resin pellets con...

Embodiment 2

[0066] (1) Preparation of resin pellets

[0067] Perfluorosulfonic acid resin is a powder obtained by copolymerization of tetrafluoroethylene, hexafluoropropylene and perfluoro 3,6-dioxa-4-methyl-7-octenesulfonyl fluoride, and its ion exchange capacity is 1.08mmol / g , the (6,6) type single-walled carbon nanotubes with a length of about 40 microns are fully mixed with the above-mentioned perfluorosulfonic acid resin powder (mass ratio 10:100), and then melt-extruded and granulated to obtain perfluorinated carbon nanotube-containing Pellets of sulfonic acid resin. The perfluorocarboxylic acid resin used is the powder obtained by the copolymerization of tetrafluoroethylene and perfluoro 4,7-dioxa-5-methyl-8-nonenoate methyl ester, the ion exchange capacity is 0.97mmol / g, and it is melt-extruded Go out and granulate to obtain the pellet of perfluorocarboxylic acid resin.

[0068] (2) Membrane preparation and reinforcement

[0069] Using the above-mentioned perfluorocarboxylic a...

Embodiment 3

[0075] Step (1), step (2) and step (3) are the same as in Example 1, except that the particle size distribution of the nano-silver powder in step (3) is 25-45 nm.

[0076] The prepared ion membrane tensile strength of the present embodiment is 33MPa, can be used for the ion exchange membrane in the chlor-alkali ion membrane electrolyzer, at 5.5kA / m 2 Under the conditions of current density of 32% by mass ratio of cathode NaOH solution, 305g / L brine concentration of anode brine entering the tank, 210g / L NaCl concentration of brine leaving the tank, tank temperature of 85-87°C, active cathode, and 1mm pole distance Test, the cell voltage is 2.24-2.31V, and the current efficiency is 96.7%.

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Abstract

The invention relates to an ion exchange membrane for superhigh-current-density oxygen cathode electrolysis and a preparation method thereof. The ion exchange membrane is a multilayer composite film composed of a perfluorocarboxylic acid ion exchange resin layer, a carbon-nanotube-containing perfluorosulfonic acid ion exchange resin layer, a reinforcing mesh, a sulfonic acid side gas release coating and a carboxylic acid side multifunctional coating, wherein the total thickness of the basal membrane of the perfluorinated ion exchange membrane is 90-180 micrometers, the thickness of the perfluorosulfonic acid resin layer is 80-160 micrometers, the thickness of the perfluorocarboxylic acid resin layer is 8-16 micrometer, and the thickness of the two side surface coatings of the membrane is respectively 3-12 micrometers. The membrane can be prepared by a melt coextrusion or multilayer hot-press compounding technique. The membrane is used for an oxygen cathode electrolysis technique, is especially suitable for ion-exchange-membrane-process caustic soda production by a superhigh-current-density oxygen cathode electrolysis technique, and has favorable mechanical properties and electrochemical properties.

Description

technical field [0001] The invention belongs to the field of macromolecular materials and electrochemistry, and in particular relates to an ion exchange membrane used in an ultra-high current density oxygen cathode electrolysis process and a preparation method thereof. Background technique [0002] The chlor-alkali industry produces caustic soda and chlorine through electrolysis of brine, and at the same time produces hydrogen as a by-product. It is a basic chemical raw material industry that occupies an important position in the national economy. At present, the domestic caustic soda method is mainly the ion-exchange membrane method, and the electricity consumption cost accounts for about 60% of the production cost. Therefore, reducing electricity consumption is of great significance for improving the economic benefits of the chlor-alkali industry. Fundamentally speaking, the huge power consumption of the chlor-alkali industry is determined by its chemical reaction itself. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B13/08C25B13/02C25B1/46
Inventor 王学军
Owner SHANDONG DONGYUE POLYMER MATERIAL
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