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Liquid-liquid phase change absorbent with controllable carbon dioxide capture threshold

A carbon dioxide and absorbent technology, applied in chemical instruments and methods, separation of dispersed particles, air quality improvement, etc., can solve the problem of high energy consumption for desorption, achieve rapid phase separation, wide application prospects, and good regeneration stability

Pending Publication Date: 2021-12-03
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Simply put the CO 2 The enriched phase is sent to the desorption tower for regeneration, thus solving the problem of high desorption energy consumption in the existing non-phase change system

Method used

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  • Liquid-liquid phase change absorbent with controllable carbon dioxide capture threshold
  • Liquid-liquid phase change absorbent with controllable carbon dioxide capture threshold
  • Liquid-liquid phase change absorbent with controllable carbon dioxide capture threshold

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A liquid-liquid phase change absorbent for carbon dioxide capture, consisting of main absorbents MEA and EAE, phase separation accelerator sulfolane and solvent water, wherein the concentration of MEA is 4mol / L, and the concentration of EAE is 1mol / L, The concentration of sulfolane is 5mol / L.

[0026] The absorbent is used to absorb CO 2 For simulated flue gas with a volume fraction of 15%, the absorption temperature is 40°C and the absorption time is 30 minutes. Absorbent absorbs CO 2 When saturation is reached, the absorbent separates into two phases and the CO 2 The rich phase is separated and sent to desorption regeneration, the regeneration temperature is 120°C, and the regeneration time is 150min.

Embodiment 2

[0028] A liquid-liquid phase-change absorbent for carbon dioxide capture, consisting of main absorbents MEA and EAE, phase-separation accelerator sulfolane and solvent water, wherein the concentration of MEA is 3mol / L, and the concentration of EAE is 2mol / L, The concentration of sulfolane is 5mol / L. All the other are identical with embodiment 1.

Embodiment 3

[0030] A liquid-liquid phase change absorbent for carbon dioxide capture, consisting of main absorbents MEA and EAE, phase separation accelerator sulfolane and solvent water, wherein the concentration of MEA is 2.5mol / L, and the concentration of EAE is 2.5mol / L L, the concentration of sulfolane is 5mol / L. All the other are identical with embodiment 1.

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Abstract

The invention discloses a liquid-liquid phase change absorbent for capturing carbon dioxide. The liquid-liquid phase change absorbent is composed of primary amine, secondary amine, an organic solvent and water, wherein the primary amine refers to monoethanolamine (MEA), the secondary amine refers to 2-(ethylamino)ethanol (EAE), and the organic solvent refers to sulfolane. The liquid-liquid phase change absorbent is in a single phase before absorbing CO2 and is in a two-phase state after absorbing CO2. After phase separation of the liquid-liquid phase change absorbent, CO2 is mainly concentrated in one phase (CO2 rich phase), the CO2 rich phase and the CO2 lean phase are separated, and the rich phase is regenerated in a high-temperature heating mode. The liquid-liquid phase change absorbent for carbon dioxide capture is good in CO2 absorption performance, rapid in phase splitting, controllable in CO2 load threshold value, excellent in mass transfer performance and good in regeneration stability. Compared with a traditional CO2 absorbent, the regeneration energy consumption is greatly reduced, and the method has a wide application prospect.

Description

technical field [0001] The present invention relates to post-combustion CO 2 The field of capture, especially involving a phase change absorbent to absorb CO 2 Methods. Background technique [0002] Global warming is one of the most concerned issues in the world today, and the main cause of this problem is CO 2 massive emissions of greenhouse gases. Currently CO 2 Capture and Utilization Technology (CCUS) is the realization of CO 2 The main way to reduce emissions and combat global warming. Common CO 2 Capture methods generally include the following: pre-combustion capture, oxyfuel combustion capture, and post-combustion capture. Among them, post-combustion capture technology does not require modification of existing devices, and has the advantages of wide adaptability and strong inheritance, and has become the main research direction at present. [0003] Post-combustion capture technologies mainly include chemical solvent absorption, physical absorption, and membran...

Claims

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Application Information

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IPC IPC(8): B01D53/14
CPCB01D53/1493B01D53/1475B01D53/1418B01D53/1425B01D53/1412B01D2252/204B01D2252/50B01D2252/20421B01D2252/20426Y02A50/20Y02C20/40
Inventor 梁志武高红霞吕娟王楠
Owner HUNAN UNIV
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