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High-purity hydrogen preparation method

A high-purity, hydrogen technology, used in hydrogen/syngas production, chemical instruments and methods, hydrogen, etc., can solve the problems of high cost, small adsorption capacity, inability to use high pressure purification, etc., and achieve safe and reliable results

Inactive Publication Date: 2017-09-22
镇江严彦气体有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Impurities such as nitrogen and carbon dioxide in hydrogen are not easy to remove by conventional methods. Although the method of palladium diffusion is sufficient and effective, it is expensive and the output is small, so it cannot be used for high-pressure purification.
Under normal conditions, nitrogen and carbon dioxide have no adsorption or very little adsorption capacity for almost all adsorbents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Preparation of raw material hydrogen: using methane and pure water as raw materials, at a temperature of 300°C and a pressure of 2.5 MPa, a silver-based catalyst is used to catalyze cracking to obtain a mixed gas mainly containing hydrogen and carbon dioxide; the mixed gas of hydrogen and carbon dioxide is carried out in an adsorber Low-temperature negative pressure adsorption separation, the adsorber is filled with an adsorbent that has selective adsorption properties for carbon dioxide, and hydrogen with a purity greater than 99.99% is obtained. The molar ratio of the raw material methane to pure water is methane:water=1:3, the temperature in the low-temperature negative pressure process is -50°C, and the adsorption pressure is -1.0MPa. The silver-based catalyst is provided by Chengdu Longfei Technology Co., Ltd., and its model is AER601. The adsorbent is activated carbon.

Embodiment 2

[0016] Raw material hydrogen preparation: using methane and pure water as raw materials, at a temperature of 450°C and a pressure of 2.5 MPa, a silver-based catalyst is used to catalyze cracking to obtain a mixed gas mainly containing hydrogen and carbon dioxide; the mixed gas of hydrogen and carbon dioxide is carried out in an adsorber. Low-temperature negative pressure adsorption separation, the adsorber is filled with an adsorbent that has selective adsorption properties for carbon dioxide, and hydrogen with a purity greater than 99.99% is obtained. The molar ratio of the raw material methane to pure water is methane:water=1:5, the temperature in the low-temperature negative pressure process is -50°C, and the adsorption pressure is -1.0MPa. The silver-based catalyst is provided by Chengdu Longfei Technology Co., Ltd., and its model is AER601. The adsorbent is fine-pore silica gel.

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PUM

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Abstract

The invention discloses a high-purity hydrogen preparation method. According to the preparation method disclosed by the invention, hydrogen with the purity larger than 80% is utilized as a raw material, an adsorbent and a low-temperature negative-pressure mode are utilized to remove impurities of nitrogen, carbon dioxide and the like in the hydrogen, and the hydrogen with the purity larger than 99.99% is obtained. The high-purity hydrogen preparation method disclosed by the invention has the characteristics of saving energy, being environmentally friendly and safe and being easy for large-scale production and operation.

Description

technical field [0001] The present invention relates to a method for preparing high-purity hydrogen, in particular to a method for preparing high-purity hydrogen by using methane cracking method as raw material and performing secondary purification. Background technique [0002] With the increasing level of science and technology, various technologies, equipment, and instruments are more dependent on high-performance, high-sensitivity electronic components, and in the production process of electronic components, especially in the production of semiconductor devices, material purity is the key , continuously put forward higher requirements for the purity of raw materials. Hydrogen is an indispensable reducing gas and protective gas in the manufacture of semiconductor electronic components. Therefore, the demand for hydrogen with a purity that meets the requirements of electronic production is increasing, and the supply cannot be met. [0003] At present, the hydrogen produce...

Claims

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Application Information

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IPC IPC(8): C01B3/26C01B3/56
CPCC01B3/26C01B3/56C01B2203/0277C01B2203/042
Inventor 周玉洁周宏峰
Owner 镇江严彦气体有限公司