Liquid-liquid phase-change absorbent for capturing carbon dioxide and application of such absorbent

A carbon dioxide, absorbent technology, applied in chemical instruments and methods, dispersed particle separation, air quality improvement, etc., to achieve the effect of increasing the load concentration, reducing the total liquid volume, and reducing energy consumption for regeneration

Inactive Publication Date: 2019-07-26
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a liquid-liquid phase change absorbent for carbon dioxide capture and its application, which solves the existing problem of capturing or separating CO 2 deficiencies in the process

Method used

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preparation example Construction

[0027] A preparation method for a liquid-liquid phase change absorbent for carbon dioxide capture, comprising the following steps:

[0028] In terms of mass percentage, weigh the following components, 20% to 60% of co-extraction agent, 10% to 50% of organic amine, 0% to 5% of auxiliary agent, and the balance is water. Mix them evenly to obtain a liquid-liquid phase change absorbent.

[0029] The absorbent described in the present invention can be used to remove CO in gas sources such as power plant flue gas, natural gas, refinery gas, shift gas, hydrogen production gas or synthesis gas. 2 capture.

Embodiment 1

[0031] In terms of mass percentage, weigh the following components, 20% of diethylenetriamine, 40% of tetramethylene sulfone, and 40% of water, and mix the components evenly to obtain a liquid-liquid phase transition Absorbent, at 40°C, 100g of liquid-liquid phase change absorbent absorbs 11.4g of CO 2 After that, liquid-liquid two phases were formed; among them, the mass of the rich-phase layer was 63.5g, and the mass of the poor-phase layer was 36.5g; the CO in the rich-phase layer 2 The load is 11.358g, accounting for the total CO 2 99.6% absorption.

Embodiment 2

[0033]In terms of mass percentage, weigh the following components, 10% of diethylenetriamine, 20% of N,N-dimethylacetamide, 3% of organosiloxane and 37% of water, to obtain Liquid-liquid phase-change absorbent, at 40°C, 100g of liquid-liquid phase-change absorbent absorbs CO 2 A liquid-liquid two-phase was formed after weighing 11.4g, wherein, the mass of the rich-phase layer was 46.8g, and the mass of the poor-phase layer was 53.2g; the CO in the rich-phase layer 2 The load was 11.07g, accounting for the total CO 2 97.1% absorption.

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PUM

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Abstract

The invention provides a liquid-liquid phase-change absorbent for capturing carbon dioxide and application of such absorbent. The liquid-liquid phase-change absorbent for capturing the carbon dioxidecomprises, by mass, 20%-60% of synergist, 10%-50% of organic amine, 0%-5% of auxiliary agent and the balance water. The liquid-liquid phase-change absorbent for capturing the carbon dioxide has the advantages that the liquid-liquid phase-change absorbent can be automatically layered into liquid-liquid phases when loading a certain amount of CO2 in the absence of energy consumption, wherein CO2 gathers in a rich phase layer, and a lean phase layer hardly loads CO2, so that CO2 can be effectively concentrated in the rich phase, the total amount of liquid entering a regenerating column is decreased through desorption of the CO2 rich phase, and energy consumption for regeneration and capture cost are reduced.

Description

technical field [0001] The invention relates to the technical field of gas purification and separation engineering, in particular to a liquid-liquid phase change absorbent for carbon dioxide capture and its application. Background technique [0002] carbon dioxide (CO 2 ) and other greenhouse gas emissions are one of the main factors causing global climate change, how to enrich CO 2 CO capture or separation from gas mixtures 2 appears to be particularly important. At present, for large-scale emission sources such as coal-fired power plants, refineries, and steel plants, chemical absorption methods are generally used to capture CO 2 . Typical CO 2 The absorption separation technology uses alkaline alcohol amines as absorbents, which are mixed with acid gas CO in the absorption tower. 2 The reaction forms compounds that separate from the gas phase and leave the absorber with the rich liquid. The rich liquid is heated in the regeneration tower, CO 2 The compound formed ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
CPCB01D53/1425B01D53/1475B01D53/1493Y02A50/20Y02C20/40
Inventor 郭东方汪世清王金意刘练波郜时旺
Owner HUANENG POWER INT INC
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