Ionic membrane electrolytic bath device for preparing alkali through oxygen cathode

Abstract

The invention relates to an ionic membrane electrolytic bath device for preparing alkali through an oxygen cathode, which mainly comprises an anode of the ionic membrane electrolytic bath and a cathode of the ionic membrane electrolytic bath, wherein a cathode gas chamber and a cathode liquid chamber are arranged on the side of the cathode of the ionic membrane electrolytic bath; and an oxygen cathode diffusion electrode (17) is arranged between the cathode gas chamber and the cathode liquid chamber and consists of a waterproof layer (24), a catalyst layer (25) and a conductive net (26) in turn. Oxygen is introduced into the cathode gas chamber (7) and is converted into OH- together with H2O to enter the cathode liquid chamber (2) under the action of the oxygen cathode diffusion electrode(17); therefore, NaOH is generated in the cathode liquid chamber (2), and H2 is not separated out of the cathode of the ionic membrane electrolytic bath. Due to a chemical reaction of 2H2O+1 / 2O2+2e=2OH- at the cathode of the alkali-preparing device, the decomposition voltage is reduced by 1.22V, and electricity can be saved by over 56 percent on the basis of standard potential estimation.

Description

technical field [0001] The invention relates to an alkali production device, in particular to an ion membrane electrolyzer device for alkali production using an oxygen cathode. Background technique [0002] The chlor-alkali industry produces caustic soda and chlorine through electrolysis of salt water, and at the same time by-produces hydrogen. It is a basic chemical raw material industry that occupies an important position in the national economy. At present, there are diaphragm method and ionic membrane method in domestic soda production, and the cost of electricity consumption accounts for about 60% of the production cost. In a sense, reducing electricity consumption is the decisive factor to improve the economic benefits of the chlor-alkali industry. [0003] Specifically, the chlor-alkali plant produces 1 ton of caustic soda, by-products 0.886 tons of chlorine and more than 1,200 cubic meters of hydrogen, and consumes about 2,500 kWh. %. Over the years, people have tr...

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Problems solved by technology

[0017] The present invention designs a kind of ion membrane electrolyzer device of oxygen cathode alkali production, and the technical problem that it solves is: (1) domestic alkali production has diaphragm method and ion membrane method to consume too much power, does not meet the current low-carbon environmental protection requirement; (2) The special composite structure of the oxygen cathode of the oxygen cathode alkali-making electrolyzer device makes it impossible to weld during installation and difficult to seal

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