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Electrochemistry method for preparing pure oxygen and poor-oxygen gas by oxygen-containing gas mixture

一种贫氧气体、电化学的技术，应用在制备纯氧及贫氧气体领域，能够解决电解水能耗高、消耗等问题，达到连续运行稳定可靠、系统使用安全、能量效率高的效果

Active Publication Date: 2015-05-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the capacity of the secondary power supply and the high energy consumption of electrolyzed water, the limited electric energy stored in the secondary battery will be consumed rapidly during operation. After a period of operation, it must be recharged by an external power supply to restart
The patented oxygen generator is only suitable for small flow and short-term intermittent use

Method used

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  • Electrochemistry method for preparing pure oxygen and poor-oxygen gas by oxygen-containing gas mixture
  • Electrochemistry method for preparing pure oxygen and poor-oxygen gas by oxygen-containing gas mixture
  • Electrochemistry method for preparing pure oxygen and poor-oxygen gas by oxygen-containing gas mixture

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Get Nafion212 film (EW=1052g / mol SO3H ) 40cm 2 , add 20ml of N-methyl-2-pyrrolidone and 10ml of isopropanol and heat to dissolve to prepare a perfluorosulfonic acid solution. Cast the perfluorosulfonic acid solution on a flat plate, heat it at 70°C for 10 hours, then raise the temperature to 77°C and heat it for 12 hours. After the solvent is basically volatilized, heat-treat it in a vacuum oven at 130°C for 1 hour to form a base film with a thickness of 18 μm. Polymer electrolyte membrane for fuel cell and 50μm solid electrolyte water electrolysis cell membrane.

[0038] Using SGL carbon paper, PTFE emulsion, XC-72 carbon powder, 5% (DuPont) solution and 20% Pt / C catalyst to prepare electrodes, in which The mass ratio of resin to C was 0.8. Negative electrode Pt load is 0.3mg / cm 2 , the positive Pt load is 0.5mg / cm 2 . Press 5cm 2 The operating conditions of the MEA three-in-one hydraulic press are 160°C, micro-pressure pre-compression for 1 minute, then incr...

Embodiment 2

[0046] Weigh 60 g of sulfonated polysulfone (60% sulfonation degree), add 10 ml of N,N-dimethylacetamide and 5 ml of diethyl ether and n-butanol and heat to dissolve. Stretch the porous polytetrafluoroethylene membrane with a thickness of 90 μm, a pore diameter of 0.09 μm, and a porosity of 90% on a stainless steel frame, pour the sulfonated polysulfone solution, heat at 60°C for 24 hours, and then heat up to 75°C for 10 Hours, after the solvent is basically volatilized, heat treatment in a vacuum oven at 100°C for 2 hours to form a base film. A solid electrolyte water electrolysis cell membrane with a thickness of 50 μm was prepared.

[0047] Get Nafion212 film (EW=1052g / mol SO3H ) 30cm 2 , add 10ml of N-methyl-2-pyrrolidone and 25ml of isopropanol and heat to dissolve to prepare a perfluorosulfonic acid solution. Cast the perfluorosulfonic acid solution on a flat plate, heat it at 65°C for 10 hours, then raise the temperature to 78°C and heat it for 14 hours. After the so...

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Abstract

The present invention relates to an electrochemical method for preparing a pure-oxygen gas and an oxygen-poor gas by using an oxygen-containing gas mixture. The method comprises at least two electrolyzed-water units and power supply units corresponding to the electrolyzed-water units. Each of the power supply units comprises at least one hydrogen energy recycling power supply unit and an externally-connected power supply unit. Each of the hydrogen energy recycling power supply unit uses a hydrogen fuel battery. Each of the externally-connected power supply unit uses at least one of the following items: a solar cell, a direct methanol fuel cell, and a power supply of an external alternating-current grid. Each of the power supply units is in circuit connection with the corresponding electrolyzed-water unit separately. Hydrogen generated by all the electrolyzed-water units is output to the hydrogen fuel batteries as a fuel. Oxygen generated by the electrolyzed-water units is the required pure oxygen. A negative electrode and a positive electrode of each of the hydrogen fuel battery of each of the hydrogen energy recycling power supply units input hydrogen and an oxygen-containing gas mixture. The input hydrogen is connected to a negative positive hydrogen chamber of the electrolyzed-water unit through a pipe. Gas-liquid separation is performed on exhaust of a positive electrode side is output as oxygen-poor gas. In the present invention, high-purity oxygen can be stably and continuously prepared in low cost on an indoor site and an outdoor site.

Description

technical field [0001] The present invention relates to a method of separating and preparing pure oxygen and oxygen-deficient gas (taking oxygen-poor air as an example) from oxygen-containing mixed gas (taking air as an example) by using electrochemical technology, especially a fuel cell and electrolyzed water technology Combined method for producing pure oxygen and oxygen-depleted gas. Background technique [0002] The production of pure oxygen is mainly through the rectification of liquefied air through the cryogenic method in industry. The disadvantage is that the equipment is huge and the process is complicated, so it is only suitable for large-scale industrial production. Molecular sieve pressure swing adsorption (PSA) method is suitable for indoor use, but the purity of oxygen obtained is not high, and its oxygen concentration can only reach 95%. In the water electrolysis process represented by solid electrolyte water electrolysis technology, the anode and cathode of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B9/04C25B1/04
CPCC25B1/04H01M8/1011H01M8/184C25B15/02C25B15/08Y02E60/50Y02E60/36Y02P20/129Y02P20/133C25B9/70C25B9/65H01M8/1007H01M16/003
Inventor 朱晓兵朱纬坤朱爱民刘景林
Owner DALIAN UNIV OF TECH
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