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Method for separating CO2 from CO2/CH4 mixed gas

A technology of mixed gas and separation method, applied in separation method, gas treatment, dispersed particle separation, etc., can solve the problems of high cost, poor mixed gas separation effect, and complicated operation.

Inactive Publication Date: 2018-09-14
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] The present invention provides a CO 2 / CH 4 CO in the mixed gas 2 The separation method solves the problem of separating CO by chemical absorption in the prior art 2 There are many limitations, and the separation by adsorption method either has high cost, complicated operation, or the presence of CH 4 and CO 2 The separation effect of the mixed gas is not good

Method used

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  • Method for separating CO2 from CO2/CH4 mixed gas
  • Method for separating CO2 from CO2/CH4 mixed gas
  • Method for separating CO2 from CO2/CH4 mixed gas

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Embodiment 1

[0063] a CO 2 / CH 4 CO in the mixed gas 2 The separation method comprises the following steps:

[0064] Step 1, under vacuum conditions, the mass m w Dry 6.30g of activated carbon at 120°C for 24 hours, cool to normal temperature after drying, and obtain dry activated carbon with a mass m of 3.30g;

[0065] Step 2, the mass m mIm 1.01g of 2-methylimidazole, mass m glycol 1.64g of ethylene glycol and 10g of ethanol are mixed uniformly to obtain a mixed solution;

[0066] 3.30g dry activated carbon obtained in step 1 is mixed with 12.65g mixed solution to obtain a solid-liquid mixture;

[0067] Step 3, put the solid-liquid mixture in step 2 under vacuum for one week, then dry at 80°C, and monitor the pore volume occupancy of ethanol in the activated carbon during the drying process, when the pore volume occupancy of ethanol in the activated carbon is monitored When the drying rate reaches 10.20%, the drying is finished and the modified activated carbon is obtained;

[00...

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Abstract

The invention discloses a method for separating CO2 from CO2 / CH4 mixed gas. The method comprises the following steps: drying activated carbon; modifying a mixture of the dried activated carbon with 2-methylimidazole, ethylene glycol and ethanol; performing adsorption separation on CO2 in CO2 / CH4 mixed gas with the modified activated carbon in a sapphire kettle under specific conditions; and calculating the CO2 adsorption capacity of modified activated carbon and a separation factor of CO2 / CH4 mixed gas. According to the invention, 2-methylimidazole, ethanol and ethylene glycol are supported onthe surface of activated carbon, so that N atoms in 2-methylimidazole molecules and hydroxyl groups in ethanol and ethylene glycol molecules on the surface of activated carbon form hydrogen bonds andfurther forms a film on the surface of activated carbon to hinder the adsorption of CH4 molecules; at the same time, CO2 molecules react with 2-methylimidazole to form carbamate containing N-C bonds,so as to improve the CO2 adsorption selectivity of activated carbon and greatly improve the separation effect of activated carbon to CO2 / CH4 mixed gas.

Description

technical field [0001] The invention belongs to the technical field of gas separation, in particular to a CO 2 / CH 4 CO in the mixed gas 2 separation method. Background technique [0002] With the development of economy and society, the consumption of coal and oil is increasing day by day, and the ensuing environmental problems are becoming more and more prominent. People are eager to find an environmentally friendly alternative energy source. As a high-quality clean energy, natural gas has the advantages of convenience, economy, high calorific value, and less pollution compared with other fuels, and natural gas as a fuel can effectively reduce CO, CO 2 , NO X And the discharge of hydrocarbons, etc., which is conducive to protecting the environment. The main component of natural gas is generally CH 4 and CO 2 , where CO 2 The existence of CO has brought many hazards: CO 2 It is an acidic gas, which easily forms an acidic solution when it meets water and corrodes pip...

Claims

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Application Information

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IPC IPC(8): B01D53/04B01J20/20B01J20/30G06F19/00
CPCB01D53/0454B01D2256/245B01D2257/502B01D2259/40028B01J20/20G16C20/10Y02C20/40
Inventor 张晓欣张路南陈光进孙长宇肖朋
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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