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Activated carbon for thickening methane in coal bed gas and preparation method of activated carbon

A technology of activated carbon and coalbed methane, applied in separation methods, chemical instruments and methods, gas fuels, etc., can solve problems such as adsorption and separation effects not mentioned, achieve sustainable development, simple preparation process, and alleviate environmental protection problems

Inactive Publication Date: 2018-05-22
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method is simple in process, easy to operate, and low in cost, but does not mention CH 4 / N 2 Adsorption and separation effect

Method used

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  • Activated carbon for thickening methane in coal bed gas and preparation method of activated carbon
  • Activated carbon for thickening methane in coal bed gas and preparation method of activated carbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] After the corncob is removed from the sponge floc layer, it is ground into a 200-mesh fine powder.

[0030] Weigh 5g of corncob fine powder and 2.5g of solid KOH, add them into 30g of distilled water, stir and mix evenly, dry at 180°C for 15h, and crush through a 20-mesh sieve. The pulverized sample was placed in a muffle furnace, under the flow rate of 0.2L / min N 2 In the atmosphere, the temperature was raised to 500°C at a heating rate of 5°C / min, and activated by constant temperature roasting for 2h. The product is taken out, washed with water until neutral, and dried to obtain corncob activated carbon.

[0031] The prepared activated carbon was evacuated and degassed at 300°C for 3 hours, and the NOVA1200e adsorption instrument of Quantachrome Company in the United States was used to measure the CH 4 and N 2 Static adsorption capacity of pure component gases, respectively 14.4cm 3 / g and 3.9cm 3 / g,CH 4 / N 2 The equilibrium separation ratio was 3.7.

[0032]...

Embodiment 2

[0034] After the corncob is removed from the sponge floc layer, it is ground into a 200-mesh fine powder.

[0035] Weigh 5g of corncob fine powder and 2.5g of solid KOH, add them into 30g of distilled water, stir and mix evenly, dry at 180°C for 15h, and crush through a 20-mesh sieve. The pulverized sample was placed in a muffle furnace, under the flow rate of 0.2L / min N 2 In the atmosphere, the temperature was raised to 600°C at a heating rate of 5°C / min, and activated by constant temperature roasting for 2h. The product is taken out, washed with water until neutral, and dried to obtain corncob activated carbon.

[0036] The prepared activated carbon was evacuated and degassed at 300°C for 3 hours, and the NOVA1200e adsorption instrument of Quantachrome Company in the United States was used to measure the CH 4 and N 2 Static adsorption capacity of pure component gases, respectively 26.6cm 3 / g and 7.4cm 3 / g,CH 4 / N 2 The equilibrium separation ratio is 3.6.

[0037] ...

Embodiment 3

[0039] After the corncob is removed from the sponge floc layer, it is ground into a 200-mesh fine powder.

[0040] Weigh 5g of corncob fine powder and 2.5g of solid KOH, add them into 30g of distilled water, stir and mix evenly, dry at 180°C for 15h, and crush through a 20-mesh sieve. The pulverized sample was placed in a muffle furnace, under the flow rate of 0.2L / min N 2 In the atmosphere, the temperature was raised to 700°C at a heating rate of 5°C / min, and activated by constant temperature roasting for 2h. The product is taken out, washed with water until neutral, and dried to obtain corncob activated carbon.

[0041]The prepared activated carbon was evacuated and degassed at 300°C for 3 hours, and the NOVA1200e adsorption instrument of Quantachrome Company in the United States was used to measure the CH 4 and N 2 Static adsorption capacity of pure component gases, respectively 35.3cm 3 / g and 10.0cm 3 / g,CH 4 / N 2 The equilibrium separation ratio is 3.5.

[0042] ...

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Abstract

The invention discloses activated carbon for thickening methane in coal bed gas and a preparation method of the activated carbon. The activated carbon is prepared by taking corncobs as a raw material,mixing the corncobs with potassium hydroxide solution serving as an activating agent, drying the mixture, and activating in an inert environment at a high temperature. The activated carbon prepared according to the preparation method has high specific surface area and high micro-pore volume; the CH4 / N2 equilibrium separation ratio of the activated carbon reaches 3.0 or higher; compared with the activated carbon which is prepared without doping potassium hydroxide, the adsorption amount is increased obviously and the separation ratio is also improved; the activated carbon is used for adsorption separation of CH4 / N2, and effective separation of the CH4 / N2 can be realized.

Description

technical field [0001] The invention belongs to the technical field of adsorbents for gas separation, and relates to a 4 , N 2 Adsorption capacity and CH 4 / N 2 Activated carbon with a balanced separation ratio, and a preparation method for the activated carbon. Background technique [0002] The main component of coalbed methane is CH 4 , N 2 etc., is an unconventional natural gas that exists in coal seams in an adsorbed, free or dissolved state. my country is rich in coalbed methane resources, and the geological resources of coalbed methane buried shallower than 2000m are about 36.81 trillion cubic meters. Therefore, the commercial development of unconventional natural gas shows great economic value. [0003] At present, the enrichment processes for methane in coalbed methane mainly include cryogenic rectification, membrane separation, and pressure swing adsorption. Among them, the pressure swing adsorption technology can be separated based on adsorption equilibrium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/324B01D53/047C10L3/10
CPCB01D53/047B01D2253/102C10L3/105
Inventor 程文萍齐金山崔杏雨马静红李瑞丰
Owner TAIYUAN UNIV OF TECH
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