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Method for preparing methanol using coal bed gas

A technology for coalbed methane and methanol, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., to achieve the effects of reducing pollution, low price, and low environmental pollution

Inactive Publication Date: 2008-11-12
SOUTHWEST RES & DESIGN INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] So far, there have been no reports on the production of methanol from coalbed methane at home and abroad

Method used

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  • Method for preparing methanol using coal bed gas

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Raw coalbed methane 5000Nm 3 / h, the composition (volume percentage, the same below) is: 40% CH 4 , 12% O 2 , 48%N 2 , pressurize to 0.3MPa, add water vapor 4821.4Kg / h, the molar ratio of added water vapor to methane in coalbed methane is: H 2 O / CH 4 =3, preheated to 500°C, sent to the autothermal reforming reactor equipped with Ni-based catalyst, using CH 4 with O 2 The heat of combustion makes part of the CH 4 Converted to H with water vapor in the presence of Ni-based catalyst 2 and CO; the gas from the thermal conversion reactor enters the external thermal conversion reactor equipped with a Ni-based catalyst, and the external thermal reformer is heated by coalbed methane to further convert the remaining methane in the coalbed methane into H 2 and CO, the outlet temperature of the external thermal reformer is 800°C, and the composition of the reformed gas is: H 2 56%, N 2 24%, CH 4 0.5%, CO 11.2%, CO 2 8.3%, gas volume 10000Nm 3 / h; the heat is recovered ...

Embodiment 2

[0020] Raw coalbed methane 5000Nm 3 / h, composition: 50% CH 4 , 10% 0 2 , 40%N 2 , pressurize to 0.6MPa, add water vapor 8036Kg / h, the molar ratio of added water vapor to methane in coalbed methane is: H 2 O / CH 4 =4, preheated to 500°C, sent to the autothermal reforming reactor equipped with Ni-based catalyst, using CH 4 with O 2The heat of combustion makes part of the CH 4 Converted to H with water vapor in the presence of Ni-based catalyst 2 and CO; the gas from the thermal conversion reactor enters the external thermal conversion reactor equipped with a Ni-based catalyst, and the external thermal reformer is heated by the purge gas of coalbed methane and methanol, so that the remaining methane in the coalbed methane is further converted into H 2 and CO, the temperature at the outlet of the external thermal reformer is 820°C, and the reformed gas composition is: H 2 62.8%, N 2 16.5%, CH 4 0.4% CO 10.4% CO 2 9.9%, gas volume 12122Nm 3 / h;

[0021] The heat is rec...

Embodiment 3

[0023] Raw coalbed methane 5000Nm 3 / h, composition: 50% CH 4 , 10%O 2 , 40%N 2 , pressurize to 0.6MPa, add water vapor 6027Kg / h, the molar ratio of added water vapor to methane gas in coalbed methane is: H 2 O / CH 4 =3, preheated to 600°C, sent to the autothermal reforming reactor equipped with Ni-based catalyst, using CH 4 with O 2 The heat of combustion makes part of the CH 4 Converted to H with water vapor in the presence of Ni-based catalyst 2 and CO; the gas from the thermal conversion reactor enters the external thermal conversion reactor equipped with a Ni-based catalyst, and the external thermal reformer is heated by the purge gas of coalbed methane and methanol, so that the remaining methane in the coalbed methane is further converted into H 2 and CO, the temperature at the outlet of the external thermal reformer is 840°C, and the reformed gas composition is: H 2 61.98%, N 2 16.9%, CH 4 0.43%, CO 12.34%, CO 2 8.35%, gas volume 11835Nm 3 / h;

[0024] Heat ...

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Abstract

The invention discloses a method for preparing methanol by coal mine methane (CMM), which belongs to the basic chemical raw material and energy field. The desulfurized coal mine methane is subject to the auto-thermal reforming and external heating reforming under the existence of catalyst to generate H2, CO2, CO, and a small quantity of mixed gas of CH4 and N2, the mixed gas is separated through two-section pressure swing absorption to respectively generate product gas containing CO, CO2 and a small quantity of N2 and product gas containing more than 98 percent of H2, the product gas is mixed to generate synthesis gas used to prepare the methanol, and the methanol synthesis gas is pressurized and then is sent into a methanol synthetic system to synthesize the methanol. The method prepares the chemical raw material methanol by the coal mine methane which must be discharged during the coal mining process, provides a methanol preparation method with lower energy consumption and smaller pollution to the environment, also provides an approach of high value utilization of the coal mine methane at the same time, reduces the pollution of the discharge of the coal mine methane to the environment, and ensures that the energy and the resource can be effectively utilized.

Description

technical field [0001] The invention relates to a method for preparing methanol by using coal bed gas, which belongs to the field of basic chemical raw materials and energy. Background technique [0002] my country has abundant coalbed methane resources. It is predicted that the resources are equivalent to 45 billion tons of standard coal, which is equivalent to the resources of conventional natural gas. In the process of coal mining, the total amount of coalbed methane emitted to the atmosphere every year reaches 19.4 billion m 3 , The discharge of coalbed methane not only pollutes the local air environment, causing serious environmental damage, but also wastes energy resources. [0003] Coalbed methane (CMM) is a gas rich in methane, and the methane concentration is above 40%, and the highest one can reach above 80%. Coalbed methane can usually be directly used as local domestic fuel and power generation. Because the price of coalbed methane is relatively low, while the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/151C07C29/152C07C31/04C01B3/34
CPCY02P20/584
Inventor 陶鹏万古共伟张剑峰管英富成雪清
Owner SOUTHWEST RES & DESIGN INST OF CHEM IND
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