Method for separation and purification of hydrogen gas

A hydrogen and atmosphere technology, applied in the fields of hydrogen separation, chemical instruments and methods, using solid contact hydrogen separation, etc., can solve the problems of large equipment investment, large precious metal palladium, high separation energy consumption, and reduce equipment investment and production costs. The effect of easy to scale up production and simple preparation process

Inactive Publication Date: 2018-06-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, industrial hydrogen is firstly produced from natural gas, coal and light hydrocarbons to produce hydrogen-containing mixed gas (75-80%H 2 ), and then through cryogenic separation or pressure swing adsorption separation, hydrogen is purified, but both cryogenic separation and pressure swing adsorption separation technologies have the disadvantages of high energy consumption and large equipment investment
In addition, the existing metal palladium tube hydrogen purification technology, due to the requirements of application strength, the thickness of the metal palladium tube must be at least 100-200 microns, which not only consumes a large amount of precious metal palladium, but also makes its hydrogen permeability very low, and its equipment investment Extremely expensive, high energy consumption for separation, hydrogen production cost and hydrogen production scale cannot meet the needs of future large-scale applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The hydrogen absorbing material used is AB 5 Type hydrogen-absorbing alloy powder, particle size 40 mesh, its composition is La 0.8 Nd 0.2 Ni 2 co 0.3 . Put 50g of the alloy material together with a small amount of quartz sand in a stainless steel reactor, and perform hydrogen absorption and desorption experiments after vacuuming:

[0014] (1) Activation: Pass hydrogen into the reactor for three hydrogen absorption and desorption experiments. The gas used is ordinary hydrogen (purity is 99.9%), the temperature is 25° C., and the operating pressure is 1-20 bar.

[0015] (2) Hydrogenation: Put ordinary hydrogen into the reactor, gradually increase the pressure to 20bar, and the pressure increase rate is 1bar / min, and stop hydrogen supply when the pressure is stable at 20bar.

[0016] (3) Hydrogen release: first reduce the system pressure to 18bar to release a certain amount of hydrogen, then gradually reduce the pressure to 1bar, and the pressure reduction rate is 1b...

Embodiment 2

[0018] The hydrogen absorbing material used is AB 5 Type hydrogen-absorbing alloy powder, particle size 30 mesh, its composition is La 0.9 Nd 0.2 Ni 4.5 co 0.5 sn 0.25 . Put 30g of the alloy material together with a small amount of quartz sand in a stainless steel reactor, heat it to 40°C, and perform a hydrogen absorption and desorption experiment after vacuuming:

[0019] (1) Activation: Pass hydrogen into the reactor for three hydrogen absorption and desorption experiments. The gas used is ordinary hydrogen (purity is 99.9%), the temperature is 40° C., and the operating pressure is 1-20 bar.

[0020] (2) Hydrogenation: 75mol% H at 40°C 2 / 25mol% CO mixed gas is passed into the reactor, and the pressure is gradually increased to 20bar, and the pressure increase rate is 1bar / min. When the pressure is stabilized at 20bar, the hydrogen supply is stopped.

[0021] (3) Hydrogen release: keep the temperature at 40°C, reduce the system pressure to 18bar to release a certain ...

Embodiment 3

[0023] The hydrogen absorbing material used is AB 5 Type hydrogen-absorbing alloy powder, the particle size is 20 mesh, and its composition is MmNi 3.7 al 0.5 Fe 0.7 Cu 0.1 (Mm = La, Ce, Pr, Nd). Put 50g of the alloy material together with a small amount of quartz sand in a stainless steel reactor, heat it to 40°C, and perform a hydrogen absorption and desorption experiment after vacuuming:

[0024] (1) Activation: Pass hydrogen into the reactor for three hydrogen absorption and desorption experiments. The gas used is ordinary hydrogen (purity is 99.9%), the temperature is 40° C., and the operating pressure is 1-20 bar.

[0025] (2) Hydrogenation: 85mol% H at 40°C 2 / 5mol%CO 2 / 10mol%N 2 The mixed gas is passed into the reactor, and the pressure is gradually increased to 20 bar at a rate of 1 bar / min. When the pressure is stabilized at 20 bar, the hydrogen supply is stopped.

[0026] (3) Hydrogen release: keep the temperature at 40°C, reduce the system pressure to 18ba...

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Abstract

The invention relates to a hydrogen gas separation and purification material. The material is prepared from rare-earth elements and other metal elements and can be prepared by adopting vacuum induction melting, and the preparation process is simple. The purification material can selectively adsorb hydrogen gas and repel other impurities, so that the purification of the hydrogen gas can be achievedin a hydrogen gas adsorption and desorption manner and can be carried out at room temperature; and the purity of the hydrogen gas can be improved to 99.999% or more in one time, so that the materialis suitable for providing high-purity hydrogen gas for industries of electronic information, semiconductors, LED, photovoltaic power generation, fuel cells and the like.

Description

technical field [0001] The invention relates to a hydrogen separation and purification material, which is composed of rare earth elements lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd) or rhenium (Re) and other metal elements (such as Fe, Ni, Co, Mn, Al, Cu, Si, Zr, Ti, V, Sn, Ce, Y, B) composed of one or several elements), has selective adsorption for hydrogen, and excludes other impurities. The purification material adopts hydrogen adsorption The desorption method realizes the purification of hydrogen, and has excellent hydrogen absorption capacity and stability. Background technique [0002] In recent years, hydrogen, as a clean and efficient secondary energy carrier, has many advantages such as cleanliness, pollution-free, high efficiency, and various application forms, and can alleviate major problems such as environmental pollution and greenhouse effect caused by current fossil energy. Therefore, hydrogen energy has been widely recognized as the energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/00C01B3/56
CPCC01B3/0057C01B3/56C01P2006/80Y02E60/32
Inventor 李慧徐恒泳唐春华
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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