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Phase change absorbent for capturing carbon dioxide and carbon dioxide capturing method

A carbon dioxide and absorbent technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of viscosity and high regeneration energy consumption at the same time, achieve regeneration heat and capture cost reduction, and reduce evaporation heat , the effect of large absorption

Active Publication Date: 2020-02-18
MCC CAPITAL ENGINEERING & RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The above-mentioned mixed absorbents based on mixed alcohol amines have their own advantages, but their regeneration energy consumption is generally high, and they cannot take into account viscosity, absorption rate, absorption capacity, regeneration energy consumption, corrosiveness, etc. at the same time, and need to be further optimized

Method used

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  • Phase change absorbent for capturing carbon dioxide and carbon dioxide capturing method
  • Phase change absorbent for capturing carbon dioxide and carbon dioxide capturing method

Examples

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Embodiment 1

[0033] This embodiment provides a phase-change absorbent for capturing carbon dioxide, which is prepared by the following method:

[0034] 0.3 moles of main absorbent N, N-dimethylbutylamine, 0.2 moles of mixed liquid of tetraethylenepentamine and ethylenediamine (among them, 0.1 moles of tetraethylenepentamine and 0.1 moles of ethylenediamine) and 1 -After 0.26 moles of propanol are mixed, add deionized water to make the volume to 100 milliliters, add the rotor and stir evenly to obtain the phase-change absorbent for trapping carbon dioxide; wherein, the volume of the added deionized water accounts for about 100% of the total volume of the phase-change absorbent. 15% of the volume.

[0035] In the phase-change absorbent prepared in this example, the molar concentration ratio of the main absorbent, the auxiliary absorbent, and 1-propanol is 3:2:2.6.

Embodiment 2

[0037] This embodiment provides a phase-change absorbent for capturing carbon dioxide, which is prepared by the following method:

[0038] 0.4 moles of the main absorbent N, N-dimethylbutylamine, 0.1 moles of the mixed solution of the auxiliary absorption agent tetraethylenepentamine and ethylenediamine (wherein, 0.05 moles of tetraethylenepentamine and 0.05 moles of ethylenediamine) and 1 -After 0.26 moles of propanol are mixed, add deionized water to make the volume to 100 milliliters, add the rotor and stir evenly to obtain the phase-change absorbent for trapping carbon dioxide; wherein, the volume of the added deionized water accounts for about 100% of the total volume of the phase-change absorbent. 16% of the volume.

[0039] In the phase-change absorbent prepared in this example, the molar concentration ratio of the main absorbent, the auxiliary absorbent, and 1-propanol is 4:1:2.6.

Embodiment 3

[0041] This embodiment provides a phase-change absorbent for capturing carbon dioxide, which is prepared by the following method:

[0042] 0.35 moles of the main absorbent N, N-dimethylbutylamine, 0.15 moles of the mixed solution of the auxiliary absorption agent tetraethylenepentamine and ethylenediamine (wherein, 0.075 moles of tetraethylenepentamine and 0.075 moles of ethylenediamine) and 1 -After 0.26 moles of propanol are mixed, add deionized water to make the volume to 100 milliliters, add the rotor and stir evenly to obtain the phase-change absorbent for trapping carbon dioxide; wherein, the volume of the added deionized water accounts for about 100% of the total volume of the phase-change absorbent. 15% of the volume.

[0043] In the phase-change absorbent prepared in this example, the molar concentration ratio of the main absorbent, the auxiliary absorbent, and 1-propanol is 3.5:1.5:2.6.

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Abstract

The invention provides a phase change absorbent for capturing carbon dioxide and a carbon dioxide capturing method. The absorbent comprises following components in percentage by volume: 25 to 55% of amain absorbent, 6 to 45% of an auxiliary absorbent, 10 to 40% of a phase splitting agent, and 5 to 25% of water, wherein the total volume percentage of the absorbent is 100%, the phase splitting agent is 1-propanol, the main absorbent is tertiary amine of alcohol amines, and the auxiliary absorbent is primary amine or secondary amine with at least two amino groups. The method of using the phase change absorbent mentioned above to capture carbon dioxide comprises a step of contacting gas containing carbon dioxide with the phase change absorbent until the absorbent becomes saturated, then the absorbent will form an upper liquid layer and a lower liquid layer, and CO2 is enriched in the lower liquid layer. After CO2 is captured, the volume of the CO2 enriched liquid phase is small, the precipitation energy consumption is low, and moreover, the absorbent also has a large absorbing capacity and a quick absorption rate.

Description

technical field [0001] The invention belongs to the technical field of carbon dioxide capture, and relates to a phase change absorbent for capturing carbon dioxide and a method for capturing carbon dioxide. Background technique [0002] In recent years, with the increasing consumption of fossil fuels, global climate change caused by greenhouse gas emissions has become a worldwide topic. According to the forecast of the US Department of Energy, by 2100, the global CO 2 The emission of such greenhouse gases will reach about 26 billion tons, greatly exceeding the load on the ecological environment and causing serious greenhouse effects and global climate problems. At present, control technologies such as capture-conversion-storage are usually used to reduce CO in the atmospheric environment. 2 concentration, while CO 2 Capture is the most critical link in the whole control process. At the same time, because industrial coal combustion is CO 2 The largest anthropogenic emiss...

Claims

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Application Information

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IPC IPC(8): B01D53/14
CPCB01D53/1475B01D53/1493Y02A50/20Y02C20/40
Inventor 张艺峰邱明英朱繁任乐崔岩王建华
Owner MCC CAPITAL ENGINEERING & RESEARCH
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