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Serial methanol and methane synthesis process taking coke-oven gas as raw material

A technology for methane synthesis and methanol synthesis, which is applied in the gas fuel, fuel, petroleum industry and other directions, can solve the problems of catalyst deactivation and rise, and achieve the effects of reducing equipment investment, simplifying process and reducing operating costs.

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] supplement CO 2 CO in the final syngas X When the content reaches 17%, directly entering the methane synthesis reactor will cause the temperature of the catalyst bed to rise above 900°C, resulting in catalyst deactivation

Method used

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  • Serial methanol and methane synthesis process taking coke-oven gas as raw material
  • Serial methanol and methane synthesis process taking coke-oven gas as raw material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Coke oven gas supplemented with CO 2 Regulation (H 2 -CO 2 / CO+CO 2 ) to 2.3~3.0, pressurize to 8.4MPa after compression, then rough desulfurization by wet method and fine desulfurization by dry method until the total sulfur content is less than 0.1ppm, and the purified synthesis gas is obtained.

[0025] When the synthesis gas enters the methanol synthesis tower, the pressure is 8.1MPa and the temperature is 220°C. The methanol synthesis reaction is carried out under the action of the low-pressure methanol synthesis catalyst. Distillation to obtain refined methanol. In the gas after separation of the liquid phase product (H 2 -CO 2 / CO+CO 2 ) is about 3, CO X content < 11%, enter the washing tower to wash off the residual methanol, and then enter the methane synthesis unit.

[0026] The methane synthesis unit is composed of two adiabatic methane synthesis reactors connected in series. The gas enters the first methane synthesis reactor after heat exchange to rai...

Embodiment 2

[0029] Introduce flue gas from coke oven combustion chamber into CO 2 Capture unit, using pressure swing adsorption method to obtain 99% pure CO 2 ; Coke oven gas is pretreated with de-tarring, de-benzene, de-naphthalene and other pretreatments and the CO captured from the flue gas 2 Mixed, compressed and boosted to 5.4MPa, then desulfurized by NHD method, then heated to 220°C, enters the hydroconversion furnace to convert the organic sulfur in the coke oven gas into inorganic sulfur, and then desulfurizes the total sulfur through zinc oxide fine desulfurization Divided below 0.1ppm, the composition is H 2 53%%, C 2 h 6 2%, CH 4 28%, CO 6%, CO 2 10%, N 2 1% syngas.

[0030] When the synthesis gas enters the methanol synthesis tower, the pressure is 5.3MPa and the temperature is 220°C. The methanol synthesis reaction is carried out under the action of the low-pressure methanol synthesis catalyst. Distillation to obtain refined methanol. In the gas after separation...

Embodiment 3

[0034] Introduce flue gas from coke oven combustion chamber into CO 2 Capture unit, using membrane separation method to obtain CO with a purity of 99% 2 ; Coke oven gas is pretreated with de-tarring, de-benzene, de-naphthalene and other pretreatments and the CO captured from the flue gas 2 Mixed, compressed and boosted to 6.4MPa, then desulfurized by NHD method, then heated to 220°C, enters the hydroconversion furnace to convert organic sulfur in coke oven gas into inorganic sulfur, and then desulfurizes the total sulfur through zinc oxide fine desulfurization Divided below 0.1ppm, the composition is H 2 53%%, C 2 h 6 2%, CH 4 28%, CO 6%, CO 2 10%, N 2 1% syngas.

[0035] When the synthesis gas enters the methanol synthesis tower, the pressure is 6.3MPa and the temperature is 220°C. The methanol synthesis reaction is carried out under the action of the low-pressure methanol synthesis catalyst. Distillation to obtain refined methanol. In the gas after separation o...

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Abstract

The invention discloses a serial methanol and methane synthesis process taking coke-oven gas as a raw material. The serial methanol and methane synthesis process comprises the following steps: capturing CO2 from fume, adding into the coke-oven gas to adjust the hydrogen-carbon ratio; performing an NHD-process rough desulfuration and dry-process fine desulfuration, thereby obtaining a purified qualified synthesis gas; synthesizing methanol by using the synthesis gas in a methanol synthesis unit under the action of a methanol synthesis catalyst firstly, and performing heat exchange and cooling separation, thereby obtaining crude methanol; refining the crude methanol, thereby obtaining a fine methanol product; feeding the gas (generated after the crude methanol is separated) into a methane synthesis unit, completing methane synthesis reaction through three serially connected methane synthesis reactors, and performing cryogenic refrigeration on the generated gas, thereby obtaining liquefied natural gas of which the content of alkane is greater than 94%. According to the process, since the methanol synthesis unit is serially connected in front of the methane synthesis units, COX(CO+CO2) in the synthesis gas is reduced to be within 13%, the synthesis gas can be directly fed into the methane synthesis units without being diluted, and the whole synthesis process is simplified.

Description

technical field [0001] The invention belongs to the field of new energy, and relates to a series methanol and methane synthesis process using coke oven gas as a raw material. Background technique [0002] Coke oven gas is a by-product of the coking process, its main components are hydrogen (55%~60%) and methane (23%~27%), and also contains a small amount of carbon monoxide (5%~8%), C2 or more unsaturated Hydrocarbons (2%~4%), carbon dioxide (1.5%~3%), oxygen (0.3%~0.8%), nitrogen (3%~7%). Coke oven gas can be used as fuel gas and raw material gas for chemical production. [0003] At present, the chemical utilization of coke oven gas is mainly used to produce methanol. According to incomplete statistics, there are currently nearly 70 coke oven gas methanol plants in China, with a total production capacity of more than 9 million t / a. The feature is that the scale of the plants is relatively small, most of which are 100,000 t / a to 200,000 t / a. Against the backdrop of my coun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/04C07C29/152C07C9/04C07C1/04C07C1/12C10L3/10
CPCC07C1/0485C07C29/1518C10L3/08C07C31/04C07C9/04
Inventor 魏士新祝东红张杰蔡进黄先亮陈长新蔡成伟吴学其
Owner CHINA PETROLEUM & CHEM CORP