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Alkali-removing method used for hydrogen production by borohydride

A technology of borohydride and sodium borohydride, applied in the production of hydrogen, the use of solid contact hydrogen separation, hydrogen separation, etc., can solve the problems of acid liquid easily entering the fuel cell stack or hydrogen generator, damaging hydrogen production equipment, etc. , to achieve the effect of small volume and reduced dosage

Active Publication Date: 2009-10-07
HANERGY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The Chinese Patent Publication No. CN 2305409Y reports the problem of hydrogen purification and alkali removal in the hydrolysis hydrogen production device. Since the cooling and condensation device is set up, it is not suitable for portable devices; the hydrogen gas produced by acid washing can effectively remove alkali, but the inlet pipe must extend to Below the acid liquid level, when the reactor pressure drops, the acid liquid will easily enter the fuel cell stack or hydrogen generator, which will seriously damage the hydrogen production equipment

Method used

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  • Alkali-removing method used for hydrogen production by borohydride

Examples

Experimental program
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Effect test

Embodiment 1

[0018] Sodium borohydride is hydrolyzed to produce hydrogen. The hydrogen generation rate is 1.4L / min. The hydrogen passes through a purification device to remove the lye contained in it. The purification device is a plexiglass tube with 7.2g SO in the middle part 4 2- / ZrO 2 Solid super acid, the front end of the glass tube is filled with heat-bonded dust-free paper with high absorption resin, and the back end of the glass tube is filled with absorbent cotton. Continuous and stable operation for 150 minutes, the purified hydrogen was passed into a certain amount of deionized water, the pH value of the deionized water did not change, indicating that the hydrogen removal rate was 100%.

Embodiment 2

[0020] Sodium borohydride is hydrolyzed to produce hydrogen. The generation rate of hydrogen is 2L / min. The hydrogen passes through a purification device to remove the lye contained in it. The purification device is a plexiglass tube with 15g AlCl filled in the middle part of the inside. 3 -CuCl 2 Compound type solid super acid, the front end of the glass tube is filled with heat-sealing dust-free paper of high absorption resin, and the back end of the glass tube is filled with absorbent cotton. After continuous and stable operation for 120 minutes, the purified hydrogen was passed into a certain amount of deionized water. The pH value of the deionized water did not change, indicating that the hydrogen removal rate was 100%.

Embodiment 3

[0022] Sodium borohydride is hydrolyzed to produce hydrogen. The hydrogen generation rate is 1L / min. The hydrogen passes through a purification device to remove the lye contained in it. The purification device is a plexiglass tube with 5g SO in the middle part of the inside. 4 - / ZrO 2 / MCM-41, the front end of the glass tube is filled with 4A molecular sieve, and the rear end of the glass tube is filled with absorbent cotton. After continuous and stable operation for 180 minutes, the purified hydrogen was passed into a certain amount of deionized water. The pH value of the deionized water did not change, indicating that the hydrogen removal rate was 100%.

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Abstract

The invention discloses an alkali-removing method used for hydrogen production by borohydride. The method adopts solid purifying medium to remove alkali vapor in hydrogen produced by the borohydride, and the solid purifying medium is solid super acid or the combination of the solid super acid and water-absorption material. The alkali-removing method has the advantages of effectively saving the volume of a purifying device, having high alkali-removing efficiency, and effectively avoiding the backflow of acid liquor, and the alkali-removing device has universal property. The invention belongs to the field of gas purification.

Description

Technical field [0001] The invention relates to a method for purifying hydrogen, in particular to a method for removing alkali for hydrogen production from borohydride. Background technique [0002] Hydrogen is a clean fuel because it can react with oxygen in hydrogen consuming devices such as fuel cells or internal combustion engines to produce energy and water. There are no by-products in the reaction. Therefore, the use of hydrogen as a fuel effectively solves the problem of using petroleum fuels. Concomitant environmental issues. However, how to store hydrogen safely and effectively has always been a problem that technicians are trying to solve. Many hydrogen carriers including hydrocarbons, metal hydrides, and chemical hydrides are regarded as hydrogen storage and supply systems, such as alkali metal hydrides and alkali metal. Aluminum hydride and alkali metal borohydride. Among them, borohydride is a material with high hydrogen storage content. It can not only catalyze the ...

Claims

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Application Information

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IPC IPC(8): C01B3/56C01B3/02
Inventor 肖钢白永格王玉晓
Owner HANERGY TECH
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