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A method for capturing and separating CO2 from gas mixtures

A gas mixture and inert gas technology, applied in the field of CO2 capture and separation, can solve the problems of high operating cost, long process flow, large equipment investment, etc., and achieve the effect of improving solubility, reducing cost and improving solubility

Active Publication Date: 2016-05-11
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a method for capturing and separating CO from a gas mixture 2 In view of the existing low-temperature methanol washing method (CN02114514.8, CN02116579.3 and CN200610107366.4) with long process flow and large equipment investment, an organic solvent is added to methanol to increase CO 2 Solubility, increase the operating temperature, solve the problem of simply using methanol to absorb CO 2 Too low temperature leads to large equipment investment and high operating costs, thus effectively reducing costs

Method used

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  • A method for capturing and separating CO2 from gas mixtures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Dissolve 10g of 12-crown-4 in 100ml of methanol to make a composite solvent, and measure the amount of CO dissolved in the composite solvent at 2.0MPa and -10°C. 2 ability to measure CO 2 The solubility in the composite solvent is 40.46kg / kg solvent, which is higher than that of CO under the same conditions 2 The solubility in methanol is 34.54kg / kg solvent.

Embodiment 2

[0020] Dissolve 12g of 15-crown-5 in 100ml of methanol to make a composite solvent, and measure the amount of CO dissolved in the composite solvent at 2.0MPa and -15°C. 2 ability to measure CO 2 The solubility in the composite solvent is 50.77kg / kg solvent, which is higher than that of CO under the same conditions 2 The solubility in methanol is 42.88kg / kg solvent.

Embodiment 3

[0022] Dissolve 6g of 18-crown-6 in 100ml of methanol to make a composite solvent, and measure the amount of CO dissolved in the composite solvent at 2.5MPa and -12°C. 2 ability to measure CO 2 The solubility in the composite solvent is 62.15kg / kg solvent, which is higher than that of CO under the same conditions 2 The solubility in methanol is 52.05kg / kg solvent.

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Abstract

The invention relates to a method for capture and separation of CO2 from a gas mixture. The method includes: a process of absorption, depressurizing desorption, heat exchange and compression; a conventional absorption and heating desorption; a process of absorption and inert gas stripping; or a process of absorption extraction of SO2, H2S and / or organic sulfur at the same time of capturing or separating CO2. The method is characterized in that: the temperature of the absorption tower ranges from -20DEG to -10DEG C, the pressure is 0.5-4MPa; the absorbent is a composite solvent of an organic crown ether solvent and methanol, and in terms of weight, the methanol accounts for 85-95%, and the organic crown ether solvent accounts for 5-15%. According to the method, compared with pure methanol without organic crown ether, the solubility of absorbed CO2 is improved by 15-30%.

Description

technical field [0001] The present invention relates to a method for capturing and separating CO from gas mixtures 2 Methods. Background technique [0002] Global warming has become an undisputed fact. Greenhouse gas CO 2 emissions are a major contributor to climate warming. How to get from rich CO 2 In the gas mixture, including gasification gas, shift gas, IGCC gas and low-quality raw material syngas to capture and separate CO 2 extremely important. [0003] According to different application occasions and the pressure of feed gas, the decarburization method can be divided into dry method and wet method. Dry methods include adsorption methods and membrane methods, and are generally applicable to CO 2 Where the concentration is low; the wet method can be divided into chemical absorption method and physical absorption method, and the chemical absorption method is mostly used in occasions where the raw material gas pressure is low. [0004] The raw material gas target...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/62
CPCY02A50/20Y02C20/40
Inventor 王万福汤志刚于笑丹陈健云箭郭栋
Owner PETROCHINA CO LTD