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Device and method used for recycling hydrogen from chlor-alkali industry vented tail gas and preparing high purity hydrogen

A technology for the chlor-alkali industry and high-purity hydrogen, which is applied in the development and application of vent gas in the chlor-alkali industry, and can solve problems such as the impact on equipment operation safety

Active Publication Date: 2016-07-20
DALIAN ZHONGDING CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, if the oxygen content in the chlor-alkali industrial tail gas is high (2%-4%), it will affect the safety of equipment operation

Method used

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  • Device and method used for recycling hydrogen from chlor-alkali industry vented tail gas and preparing high purity hydrogen

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) Chlor-alkali tail gas

[0056] Chlor-alkali tail gas volume: 500m 3 / h Temperature: 25°C Pressure: 1 atmosphere

[0057] Main components: H 2 96%, O 2 3%, Cl 2 ≥100ppm, the rest is a small amount of carbon dioxide, etc.

[0058] (2) Dechlorination agent

[0059] Use caustic soda solution NaOH concentration 2% (mass percentage);

[0060] QT-C1 high-efficiency dechlorination agent (main component: ZnO / Al 2 o 3 / CaO add accelerator, the mass ratio of each component is 40%, 40%, 20%), the use of space velocity: 3000h -1 Total loading: 0.2m 3

[0061] Fine dechlorination tower aspect ratio: 5

[0062] (3) Catalyst

[0063] Catalytic deoxidizer AC-3 type precious metal catalyst (the active component is palladium, the carrier is alumina, the active component accounts for 0.2% of the weight of the carrier)

[0064] Noble metal catalyst use space velocity: 5000h -1

[0065] The total amount of precious catalyst loaded: 0.15m 3

[0066] Catalytic deoxidation ...

Embodiment 2

[0072] (1) Chlor-alkali tail gas

[0073] Chlor-alkali tail gas volume: 1500m 3 / h Temperature: 25°C Pressure: 1 atmosphere

[0074] Main components: H 2 97%, O 2 2%, Cl 2 ≤30ppm, the rest is a small amount of carbon dioxide, etc.

[0075] (2) Dechlorination agent

[0076] QT-C1 high-efficiency dechlorination agent (main component: ZnO / Al 2 o 3 / CaO adds promotor, the same embodiment 1), using space velocity: 3000h -1 Total loading: 0.6m 3

[0077] Fine dechlorination tower aspect ratio: 8

[0078] (3) Catalyst (same as above embodiment 1) noble metal catalyst use space velocity: 5000h -1

[0079] The total amount of precious catalyst loaded: 0.5m 3

[0080] Catalytic deoxidation tower aspect ratio: 6

[0081] (4) steps

[0082] Chlor-alkali tail gas hydrogen (1500m 3 / h) (wherein the chlorine content is less than or equal to 30ppm, and the oxygen content is 2%), the atmospheric pressure hydrogen is pressurized to about 0.03Mpa through the water ring compresso...

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Abstract

The invention provides a device and a method used for recycling hydrogen from chlor-alkali industry vented tail gas and preparing high purity hydrogen. The method comprises following steps: two times of alkaline washing, one time of water washing, adsorption deep dechlorination, water ring compressor pressurizing, catalytic deoxidation, water cooling, terminal purification, oxygen dilution with countercurrent flow hydrogen, and explosion precaution. Production hydrogen purity of the method is as high as 99.9 to 99.999999%, and recovery rate is as high as 98%. Chlorine content and oxygen content in residual impurities can be as low as 1*10<-8> respectively, and flexible adjustment can be realized based on product purity requirements. The method is especially suitable to separate and recycle hydrogen from vented tail gas in chlor-alkali production, and possesses excellent economic benefits and environmental protection benefits.

Description

technical field [0001] The invention belongs to the field of development and application of venting tail gas in chlor-alkali industry, and in particular relates to a device and method for recovering hydrogen from venting tail gas in chlor-alkali industry to prepare high-purity hydrogen. Background technique [0002] Hydrogen is a chemical raw material and a new type of clean energy. The volume ratio of hydrogen in high-purity hydrogen is more than 99.999%, and the oxygen content is less than 1×10 -6 , carbon monoxide and carbon dioxide are also less than 1×10 -6 , The hydrogen content in ultra-pure hydrogen is as high as 99.9999%. High-purity hydrogen is an important variety of industrial gases, widely used in chemical industry, petrochemical, petroleum, energy, electronics, metallurgy, food, machinery, aerospace, nuclear industry and many other fields. In recent years, with the rapid growth of domestic and foreign industrial gas markets, the demand for high-purity hydroge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/50
Inventor 丛卫军赵霖高嵩乐韵刘皖南于洋刘超邱长春
Owner DALIAN ZHONGDING CHEM
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