Novel process for co-production of liquefied synthesis gas, pure hydrogen and methanol from coke-oven gas

A technology for synthesizing natural gas and coke oven gas, which is applied in gas fuel, organic chemistry, petroleum industry, etc. It can solve the problems of overcapacity, loss of coke oven gas, large investment, etc., and achieve the effect of avoiding high temperature and carbon formation

Inactive Publication Date: 2012-07-18
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] In the coke oven gas recycling technology published in the above patents, if only gas separation technology such as pressure swing adsorption, membrane separation, etc. is used, one or two relatively pure gas products can be obtained, but the coke oven gas will inevitably lose Other resources, because the main components of coke oven gas are hydrogen and methane, but there are many other components; coke oven gas is converted into hydrogen-rich synthesis gas by conversion reaction method, which is suitable for the main production of hydrogen, methanol, synthetic ammonia products, etc. The investment is relatively large, and the current production capacity of synthetic ammonia in China is seriously surplus; if the methanation reaction is used to produce synthetic natural gas, there will be strong exothermic removal, carbon formation and oxygen consumption in the methanation reaction. Hydrogen to generate water and other technical issues

Method used

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  • Novel process for co-production of liquefied synthesis gas, pure hydrogen and methanol from coke-oven gas
  • Novel process for co-production of liquefied synthesis gas, pure hydrogen and methanol from coke-oven gas
  • Novel process for co-production of liquefied synthesis gas, pure hydrogen and methanol from coke-oven gas

Examples

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Effect test

Embodiment 1

[0038] Such as figure 1 As shown, the purified coke oven gas is compressed and pressurized to 5MPa, and the main component content of coke oven gas is calculated as: H 2 56%, CH 4 27%, N28.6%, CO 6.2%, CO 2 2.2%, and other small components can be ignored. The crude methanol product is obtained through heat exchange and into the methanol synthesis tower, and the crude methanol is refined through rectification to obtain refined methanol. The methanol synthesis catalyst adopts XNC-98 catalyst, and the CO content is reduced by circulation. to 1.5%, CO 2 After reducing to 2%, it is sent to the methanation heat exchange, preheating and methanation adiabatic catalytic reactor. The inlet of the methanation reactor is 250°C, and the outlet is about 440°C. It can react the total amount of COx to about 8PPM, including 2 Carbon atoms (carbon two) and hydrocarbons with more than 2 carbon atoms will be hydrogenated into methane, and after heat exchange, cooling and water separation, H...

Embodiment 2

[0040] Such as figure 1 As shown, the purified coke oven gas is compressed and pressurized to 2MPa, and the main component content of coke oven gas is calculated as: H 2 56%, CH 4 27%, N28.6%, CO 6.2%, CO 2 2.2%, and other small components can be ignored. The crude methanol product is obtained through heat exchange and into the methanol synthesis tower, and the crude methanol is refined through rectification to obtain refined methanol. The methanol synthesis catalyst adopts XNC-98 catalyst, and the CO content is reduced by circulation. to 1.5%, the CO2 is reduced to 2%, and sent to the methanation heat exchange, preheating and methanation adiabatic catalytic reactor. The inlet of the methanation reactor is 250 ° C, and the outlet is about 440 ° C. 10PPM, C2 and above hydrocarbons will be converted to methane by hydrogenation, after heat exchange, cooling and water separation, the H2 containing 47%, CH 4 41%, Yu N 2 The mixed gas, the pure hydrogen product (more than 99...

Embodiment 3

[0042] Such as figure 1 As shown, the purified coke oven gas is compressed and pressurized to 10MPa, and the main component content of coke oven gas is calculated as: H 2 56%, CH 4 27%, N28.6%, CO 6.2%, CO 2 2.2%, and other small components can be ignored. The crude methanol product is obtained through heat exchange and into the methanol synthesis tower, and the crude methanol is refined through rectification to obtain refined methanol. The methanol synthesis catalyst adopts XNC-98 catalyst, and the CO content is reduced by circulation. After CO2 drops to 1.8%, it is sent to the methanation heat exchange, preheating and methanation adiabatic catalytic reactor. The inlet of the methanation reactor is 250°C, and the outlet is about 430°C. The total amount of COx can be reacted to 5PPM, hydrocarbons containing 2 carbon atoms or more will be hydrogenated into methane, after heat exchange, cooling and water separation, a mixed gas containing 47% of H2, 41% of CH4 and remaining...

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Abstract

The invention discloses a process for co-production of liquefied synthesis gas, pure hydrogen and methanol from coke-oven gas. The process comprises the steps of: (a) firstly, purifying and compressing the coke-oven gas, then enabling the gas after being subjected to the heat exchange of a heat exchange device to enter into a methanol synthesis tower for a methanol synthesis catalytic reaction, exchanging heat of discharged gas by a heat exchanger, and enabling the gas after being cooled by a cooler to enter into a methanol separator so as to obtain crude methanol; and (b) preparing refined methanol, enabling the gas to enter into a methanol washing machine, washing away trace methanol in the gas with water, enabling partial gas after being compressed by a circular compressor to turn back to the heat exchanger for methanol synthesis and enabling other gas to enter into a heat exchanger for methanation, enabling the gas to enter into a pre-heater after heat energy is recycled, adding a small amount of aqueous vapor in the pre-heater and then enabling the gas to enter into a methanation reaction furnace. According to the process disclosed by the invention, content of oxycarbide in the gas is reduced and the methanol product is obtained through resource recycling, residual small amount of oxycarbide is removed thoroughly and hydrogen resource with high value is recycled, and the obtained liquefied natural gas is convenient to transport.

Description

technical field [0001] The invention relates to the application field of coke oven gas, which also includes intermediate products, specifically a process for coproducing liquefied synthetic natural gas, pure hydrogen and methanol by coke oven gas. Background technique [0002] China is the country with the largest steel output in the world. At present, the supporting coke production capacity can reach more than 400 million tons, and the surplus coke oven gas produced by the coke industry can reach more than 60 billion cubic meters. A large part of this coke oven gas is "pointed" Torch" and so on are discharged. The typical composition of coke oven gas is (V.): 55-60% hydrogen, 23-27% methane, 5-8% carbon monoxide, 1.5-3% carbon dioxide, 2-7% carbon dioxide and above hydrocarbons, 3-2% nitrogen 7%, oxygen 0.3-0.8%, the calorific value of coke oven gas is about 17500 kJ / m3, rich in hydrogen, methane and other raw material components suitable for one-carbon chemical industry, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/08C01B3/02C07C31/04C07C29/15
Inventor 贺安平杜勇申亚平申文杰
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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