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Liquid-solid phase change absorbent used for carbon dioxide capture and application of absorbent

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 regeneration energy consumption, and achieve the effects of low volatility, strong tolerance, and low price

Inactive Publication Date: 2019-05-03
HUANENG POWER INTERNATIONAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a liquid-solid phase-change absorbent for carbon dioxide capture and its application, which solves the problem of high regeneration energy consumption in existing carbon dioxide absorption or separation methods

Method used

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  • Liquid-solid phase change absorbent used for carbon dioxide capture and application of absorbent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1. In terms of mass percentage, weigh the following three components, 10% carbonate, 2% bicarbonate, 1% absorption activator, 0.01% absorption aid, and the balance is water , and mix each component evenly to obtain three parts of liquid-solid phase-change absorbent;

[0030] 2. Set the temperature to 40°C, gas phase CO 2 Partial pressure of 10.8kPa, 29.5kPa, 79.0kPa containing CO 2 and N 2 The mixed gas is input into three parts of the liquid-solid phase-change absorbent respectively, and after the gas-liquid two-phase reaches equilibrium, the CO in the absorption solvent is 2 See Table 1 for load capacity. of which CO 2 The load is defined as the absorbed CO 2 Amount and initial K in solution 2 CO 3 The molar ratio of the amount, mol / mol.

[0031] Table 1 Experimental results of 30% potassium carbonate aqueous solution at 40°C

[0032]

Embodiment 2

[0034] 1. In terms of mass percentage, weigh the following three components, 30% carbonate, 20% bicarbonate, 15% absorption activator, 5% absorption aid, and the balance is water , and mix each component evenly to obtain three parts of liquid-solid phase-change absorbent;

[0035] 2. Set the temperature to 70°C, gas phase CO 2 Partial pressure of 10.3kPa, 40.9kPa, 83.4kPa containing CO 2 and N 2 The mixed gas of the mixed gas is input into three parts of the solvent respectively, and after the gas-liquid two-phase reaches equilibrium, the CO in the solvent is absorbed 2 Refer to Table 2 for load capacity.

[0036] Table 2 Experimental results of 30% potassium carbonate aqueous solution at 70°C

[0037]

Embodiment 3

[0039] 1. In terms of mass percentage, weigh the following three components, 60% of carbonate, 40% of bicarbonate, 20% of absorption activator, 10% of absorption aid, and the balance is water , and mix each component evenly to obtain three parts of liquid-solid phase-change absorbent;

[0040] 2. Set the temperature to 120°C, gas phase CO 2 Partial pressure of 16kPa, 56kPa, 105kPa containing CO 2 and N 2 The mixed gas of the mixed gas is input into three parts of the solvent respectively, and after the gas-liquid two-phase reaches equilibrium, the CO in the solvent is absorbed 2 Refer to Table 3 for load capacity.

[0041] Table 3 Experimental results of 30% potassium carbonate aqueous solution at 120°C

[0042]

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Abstract

The invention provides a liquid-solid phase change absorbent used for carbon dioxide capture and an application of the absorbent. The absorbent comprises the following components, in percentages by mass: 10%-60% of a carbonate, 2%-40% of a bicarbonate, 1%-20% of an absorption activator, 0.01%-10% of an absorption auxiliary agent, and the balance of water. According to the absorbent provided by theinvention, precipitation of the bicarbonate is realized by utilizing solubility difference of the carbonate and the bicarbonate in an aqueous solution and using a chemical exchange or cooling crystallization manner, then the high-concentration bicarbonate crystal slurry is subjected to pyrolysis regeneration, so that participation of water during regeneration can be reduced, solvent heating sensible heat during the enriched-liquid regeneration and water gasification latent heat can be reduced, and CO2 regeneration heat consumption and capture costs can be reduced.

Description

technical field [0001] The invention relates to the technical field of gas purification and separation engineering, in particular to a liquid-solid 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 w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
CPCY02A50/20Y02C20/40
Inventor 郭东方汪世清王金意刘练波郜时旺
Owner HUANENG POWER INTERNATIONAL
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