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Method for extracting hydrogen and methane from coke oven gas by utilizing membrane separation and low-temperature rectification

A technology of coke oven gas and low temperature rectification, which is applied in hydrogen separation, fractional condensation purification/separation, organic chemistry, etc., can solve the problem of high production cost

Inactive Publication Date: 2010-06-23
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technology of producing hydrogen has been applied in industry for a long time, but the production cost is too high

Method used

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  • Method for extracting hydrogen and methane from coke oven gas by utilizing membrane separation and low-temperature rectification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Compress the coke oven gas collected from coke production with a hydrogen content of 56% and a methane content of 26% to 0.12MPa and cool it to 40°C, and then undergo rough desulfurization and pretreatment to remove sulfur, benzene, naphthalene and tar Impurities;

[0043] After crude desulfurization and pretreatment, the coke oven gas is compressed to 2.2MPa and hydrolyzed to remove H at 130°C 2 S;

[0044] Hydrolyzed coke oven gas is used to remove CO by N-methyldiethanolamine wet method 2 , so that CO in coke oven gas 2 content down to trace amounts;

[0045] CO removal by N-methyldiethanolamine wet method 2 The coke oven gas adopts the method of adsorption to remove sulfide, mercury, moisture and high-carbon compounds above C5;

[0046] After the above steps, the coke oven gas with a temperature of 50°C and a pressure of 2.2MPa enters the membrane separation device. The polymer film in the membrane separation device is a polyimide membrane, which can also be a ...

Embodiment 2

[0060] Compress the coke oven gas collected from coke production with a hydrogen content of 61% and a methane content of 23% to 0.13MPa and cool it to 30°C, and then undergo rough desulfurization and pretreatment to remove sulfur, benzene, naphthalene and tar Impurities;

[0061] After crude desulfurization and pretreatment, the coke oven gas is compressed to 3.0MPa and hydrolyzed to remove H at 300°C 2 S;

[0062] Hydrolyzed coke oven gas is used to remove CO by N-methyldiethanolamine wet method 2 , so that CO in coke oven gas 2 content down to trace amounts;

[0063] CO removal by N-methyldiethanolamine wet method 2 The coke oven gas adopts the method of adsorption to remove sulfide, mercury, moisture and high-carbon compounds above C5;

[0064] After the above steps, the coke oven gas with a temperature of 50°C and a pressure of 2.7MPa enters the membrane separation device. The polymer film in the membrane separation device is a polysulfone membrane, or a polyimide mem...

Embodiment 3

[0078] Compress the coke oven gas collected from coke production with a hydrogen content of 61% and a methane content of 23% to 0.15MPa and cool it to 20°C, and then undergo rough desulfurization and pretreatment to remove sulfur, benzene, naphthalene and tar Impurities;

[0079] After crude desulfurization and pretreatment, the coke oven gas is compressed to 4.0MPa and hydrolyzed to remove H at 430°C 2 S;

[0080] Hydrolyzed coke oven gas is used to remove CO by N-methyldiethanolamine wet method 2 , so that CO in coke oven gas 2 content down to trace amounts;

[0081] CO removal by N-methyldiethanolamine wet method 2 The coke oven gas adopts the method of adsorption to remove sulfide, mercury, moisture and high-carbon compounds above C5;

[0082] After the above steps, the coke oven gas with a temperature of 50°C and a pressure of 2.7MPa enters the membrane separation device. The polymer film in the membrane separation device is a polysulfone membrane, or a polyimide mem...

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Abstract

The invention relates to a method for extracting hydrogen and methane from coke oven gas by utilizing membrane separation and low-temperature rectification, comprising: the coke oven gas is compressed to be 0.12-0.15MPa, after the temperature is cooled to 20-40 DEG C, sulphur, benzene and tar are removed; the coke oven gas is compressed to be 2.2-4.0MPa, H2S is removed by hydrolysis; CO2 is removed by a N-methyldiethanolamine wet process, sulfide, mercury, moisture and compounds with more than five carbons are removed by an adsorptive process; and then the coke oven gas enters in a membrane separation device under 1.5-4.0MPa at 20-60 DEG C, hydrogen is separated from CH4, N2 and CO, and the separated hydrogen is compressed to be 2.0-5.0MPa and enters in a liquid hydrogen device to obtain the liquid hydrogen; the coke oven gas enters into a changing-over plate heat exchanger and the residual substances with above -50 DEG C of boiling point in the coke oven gas are removed by reducing the temperature; the coke oven gas enters in a low-temperature rectification tower, and liquid methane containing C1, C2 and C3 is extracted from the tower bottom, the purity can reach 98 percent, the content of the carbon monoxide is less than 05 percent, and the liquid methane is heated to be gaseous methane.

Description

field of invention [0001] The invention belongs to a method for producing hydrogen and methane, in particular to a method for extracting hydrogen and methane from coke oven gas by using membrane separation and low-temperature rectification. Background technique [0002] Coke oven gas refers to the combustible gas obtained while producing coke and tar products after high-temperature dry distillation of coking coal in a coke oven, which is a by-product of coking products. [0003] The calorific value of coke oven gas is about 17580kJ / m 3 ~18420kJ / m 3 , the calorific value of natural gas is about 35588kJ / m 3 , the calorific value of coke oven gas is about half of the calorific value of natural gas. The density of coke oven gas is 0.45kg / m 3 ~0.48kg / m 3 . The ignition temperature is 600℃~650℃. It has the characteristics of fast burning speed, fast ignition and short flame. The theoretical combustion temperature is 1800℃~2000℃. [0004] For every ton of coke smelted, 430m ...

Claims

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Application Information

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IPC IPC(8): C07C9/04C07C7/09C01B3/50
Inventor 刘新厚姚冠辉
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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