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Method for absorbing carbon dioxide in multistage microchannel reaction system

A technology of microchannel reaction and carbon dioxide, applied in the direction of absorption, chemical instruments and methods, separation methods, etc., can solve the problems of bulky absorption tower, limited mass transfer rate, high maintenance cost, etc., to shorten contact time and improve use efficiency , the effect of improving process efficiency

Inactive Publication Date: 2013-10-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the absorption tower is bulky, the heat and mass transfer rate per unit volume is limited, and the maintenance cost is high, especially when it is applied to offshore oil and gas fields, there are many inconveniences

Method used

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  • Method for absorbing carbon dioxide in multistage microchannel reaction system
  • Method for absorbing carbon dioxide in multistage microchannel reaction system
  • Method for absorbing carbon dioxide in multistage microchannel reaction system

Examples

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Effect test

Embodiment 1

[0034] A first-stage microchannel reaction system ( figure 1 ) to absorb carbon dioxide, the absorbent (LS1) used is an aqueous solution containing 30wt% monoethanolamine, the mixed gas (FG1) used is composed of carbon dioxide and nitrogen, and contains 100ppm oxygen at the same time, wherein the volume fraction of carbon dioxide is 30%, monoethanolamine The molar ratio to carbon dioxide is 2.3, the operating pressure of the microchannel absorber (R1) is 3MPa, the operating temperature is 45°C, and the equivalent diameter of the microchannel is 400 microns. The device absorbs carbon dioxide, such as Figure 6 As shown, the conversion rate of carbon dioxide is above 96%.

Embodiment 2

[0036] A first-stage microchannel reaction system ( figure 1 ) to absorb carbon dioxide, the absorbent (LS1) used is an aqueous solution containing 30wt% monoethanolamine, the mixed gas (FG1) used is composed of carbon dioxide and nitrogen, and contains 500ppm water vapor, wherein the volume fraction of carbon dioxide is 30%, slightly The operating pressure of the channel absorber (R1) is 5MPa, the operating temperature is 25°C, the equivalent diameter of the microchannel is 400 microns, the absorber containing 16 microchannels is adopted, the molar ratio of monoethanolamine to carbon dioxide is 6, and the residence time is 0.3 seconds, the concentration of carbon dioxide in the mixture (PG1) can be reduced to 50ppm.

Embodiment 3

[0038] A two-stage microchannel reaction system ( image 3 ) to absorb carbon dioxide, the absorbent used is an aqueous solution containing 30wt% diethanolamine, the mixed gas used comprises carbon dioxide, methane and a small amount of ethane and propane, and the volume fraction of carbon dioxide in the first stage mixed gas (FG1) is 70%, The operating pressure of the microchannel absorber (R1) is 3 MPa, and the operating temperature is 25°C. The microchannel absorber containing 16 microchannels is adopted. The equivalent diameter of the microchannel is 700 microns, and the molar ratio of diethanolamine to carbon dioxide is 2.2. The residence time is 0.06 seconds. After absorption, the volume fraction of carbon dioxide in the mixed gas (PG1) is reduced to 3.0%; the gas valve (GV1, 0) is fully closed, and the gas valve (GV1, 2) is fully opened to make the mixed gas ( PG1) all enter the second-stage microchannel system; the operating pressure of the second-stage microchannel ab...

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Abstract

The invention provides a method for absorbing carbon dioxide in a multistage microchannel reaction system. The method is characterized in that the type of an absorbent and the structure of a microchannel absorber applied at each stage in the system can be selected and regulated so that the carbon dioxide absorption requirements under special working conditions can be achieved. Due to adoption of the method, the concentration of carbon dioxide in mixed gases can be reduced to be below 50 ppm.

Description

technical field [0001] The invention belongs to the field of gas recovery and purification, and in particular relates to a method for absorbing carbon dioxide in a multistage microchannel reaction system. Background technique [0002] Currently, CO 2 Emission reduction has become a global issue. On December 15, 2007, the United Nations Climate Change Conference adopted the "Bali Island Roadmap". Governments of all countries attach great importance to and actively promote the development and application of new technologies to reduce greenhouse gas emissions, adapt to and mitigate climate change Variety. On November 9, 2011, the State Council discussed and approved the "Twelfth Five-Year Plan" to control greenhouse gas emission work plan, which clarified that by 2015, my country's carbon dioxide emissions per unit of GDP will be reduced by 17% compared with 2010. Addressing climate change is a major strategy for economic and social development. [0003] Industrial CO 2 The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/62B01D53/14B01J19/00
CPCY02C10/04Y02C10/06Y02A50/20Y02C20/40
Inventor 陈光文叶春波赵玉潮焦凤军
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI