Preparation method of high purity hydrogen

A preparation process and high-purity technology, applied in the field of hydrogen preparation technology, can solve the problems of reduced hydrogen production cost, small output and high construction cost

Inactive Publication Date: 2010-02-17
JINAN DEYANG SPECIAL GAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The cost of hydrogen production has been continuously reduced. Pressure swing adsorption technology has been used in the preparation of pure hydrogen, so that the purity of hydrogen can reach 99.95-99.995%, which creates a favorable foundation for further purification of hydrogen, but its purity still cannot meet the requirement

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  • Preparation method of high purity hydrogen

Examples

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Effect test

Embodiment 1

[0030] Preparation of raw material hydrogen: using methanol and pure water as raw materials, at a temperature of 268°C and a pressure of 1.0Mpa, copper-based catalysts are used to catalyze and pyrolyze to obtain reformed gas mainly containing hydrogen and carbon dioxide; hydrogen and carbon dioxide reformed gas is in the adsorber Carry out pressure swing adsorption separation, fill the adsorbent with selective adsorption performance to carbon dioxide, methane and carbon monoxide in the adsorber, utilize pressure swing adsorption (PSA) technology to extract pure hydrogen from reformed gas, and the described molar ratio is methanol: water=1 : 1.14, PSA pressure 1MPa, desorption pressure 0.02Mpa, adsorption temperature: room temperature, methanol unit consumption 0.61kg / Nm 3 , The purity of the obtained hydrogen: >99.99%, the impurities and contents of the raw hydrogen are shown in Table 1. The production device for raw material gas pure hydrogen is manufactured by Sichuan Yalian...

Embodiment 2

[0037] Preparation of raw material hydrogen: molar ratio: methanol: water = 1:1.15, transformation temperature 271°C, transformation pressure 1.0MPa, pressure swing adsorption pressure 1.0MPa, desorption pressure 0.02Mpa, adsorption temperature at room temperature, methanol unit consumption 0.595kg / Nm 3 , The purity of the hydrogen obtained: >99.99%, the impurities and their contents in the raw hydrogen are shown in Table 3, and the rest are the same as in Example 1.

[0038] Impurity content (weight ratio) in the pure hydrogen raw material gas of table 3

[0039] Impurities

Content (10 -6 )

Nitrogen (N 2 )

52

Oxygen (O 2 )

4

carbon monoxide (CO)

3.6

carbon dioxide (CO 2 )

2.8

Methane (CH 4 )

3

water (H 2 O)

10

[0040] Hydrogen secondary purification: with the secondary purification method of Example 1, the product hydrogen with a purity greater than 99.9999% is obtai...

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Abstract

The invention discloses a preparation method of hydrogen. The invention uses the hydrogen with the purity of 99.99% as raw material, adopts pressure and temperature pressure swing adsorption technology and utilizes the principle that the hydrogen separation coefficient of residual impurities in hydrogen such as N2, CH4 and the like is larger than that of the surface of adsorbents such as activatedcarbon, fine-pored silica gel and the like, to prepare hydrogen with the purity of more than 99.9999%. The process of the invention is characterized by energy-saving, environmental protection, safety, capability of large-scale production and convenient operation. The use of pressure and temperature pressure swing adsorption technology avoids the defect of the traditional technology that inert gassuch as nitrogen and the like in hydrogen are hard to remove, no discharge of three wastes is appeared, the coexist of oxygen and hydrogen is precluded and the method is safer and more reliable.

Description

technical field [0001] The present invention relates to a kind of hydrogen (H 2 ) preparation process, in particular to a method for preparing high-purity hydrogen using methanol cracking as a raw material, and performing secondary purification to prepare ultra-purity hydrogen. Background technique [0002] With the increasing level of science and technology, various technologies, equipment, and instruments are more dependent on high-performance and high-sensitivity electronic components. In the production process of electronic components, especially in the production of semiconductor devices, the purity of materials is the key. Higher requirements are constantly being placed on 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. Ult...

Claims

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Application Information

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IPC IPC(8): C01B3/22C01B3/56B01D53/047
CPCY02C10/08Y02C20/40Y02P20/10Y02P20/151Y02P20/50
Inventor 魏春河张裕机周德英王立建周宗梁苏理
Owner JINAN DEYANG SPECIAL GAS
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