A Method for Separating CO2 Using High Viscosity Absorbent Based on Solubilizing Effect

An absorbent and high-viscosity technology, which is applied in the direction of separation methods, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of increased viscosity of absorbents and affecting absorption effects, etc., to increase the concentration of absorbents and reduce energy consumption for desorption , the effect of increasing the absorption rate

Active Publication Date: 2018-08-03
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase in the concentration of the absorbent will cause the viscosity of the absorbent to increase, which will affect the absorption effect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 24 g of an aqueous solution having a mass fraction of ethanolamine (MEA) of 50% was prepared, and 16 g of n-butanol was added thereto to obtain 40 g of a novel absorbent. The mass of n-butanol added is 66.7% of the original high-viscosity amine absorbent. Then, absorb to saturation at a temperature of 20°C under normal pressure, the absorbent forms a liquid-liquid two-phase, and the upper liquid phase is CO 2 Loaded lean phase, volume 20.0 mL, CO 2 The load is 0.179mol / L, and the lower liquid phase is CO 2 Loaded rich liquid phase, volume 24.0 mL, CO 2 The loading was 4.915 mol / L. will CO 2 The loaded rich phase is separated and desorbed to obtain CO 2 ; Absorbent and CO after desorption 2 The loaded lean phase is mixed, and then the cycle reaction is absorbed.

Embodiment 2

[0027] 24 g of an aqueous solution having a mass fraction of triethanolamine (TEA) of 50% was prepared, and 16 g of n-butanol was added thereto to obtain 40 g of a novel absorbent. The mass of n-butanol added is 66.7% of the original high-viscosity amine absorbent. Then, absorb to saturation at a temperature of 20°C under normal pressure, the absorbent forms a liquid-liquid two-phase, and the upper liquid phase is CO 2 Loaded lean phase, volume 24.5 mL, CO 2 The load is 0.200mol / L, and the lower liquid phase is CO 2 Loaded rich liquid phase, volume 17.5 mL, CO 2 The loading was 1.635 mol / L. will CO 2 The loaded rich phase is separated and desorbed to obtain CO 2 ; Absorbent and CO after desorption 2 The loaded lean phase is mixed, and then the cycle reaction is absorbed.

Embodiment 3

[0029] 30 g of an aqueous solution with a mass fraction of benzylamine of 66.7% was prepared, and 10 g of benzene was added thereto to obtain 40 g of a novel absorbent. The mass of added benzene is 33.3% of the original high-viscosity amine absorbent. Then, absorb to saturation at a temperature of 20°C under normal pressure, the absorbent forms a liquid-solid two-phase, and the liquid phase is CO 2 Supported lean phase, solid phase is CO 2 rich phase of the load. will CO 2 The loaded rich phase is separated and desorbed to obtain CO 2 ; Absorbent and CO after desorption 2 The loaded lean phase is mixed, and then the cycle reaction is absorbed.

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Abstract

The invention relates to a method using a high-viscosity absorbent to separate CO2 based on a dissolution assisting effect and belongs to the technical field of gas separation and the field of environment protection. The method is characterized in that due to the dissolution assisting effect of amine, a novel absorbent can be obtained by mixing an organic solvent which does not dissolve in water with the high-viscosity amine absorbent; the novel absorbent reacts with to-be-separated CO2, the novel absorbent forms liquid-liquid phases or liquid-solid phases due to the fact that the amine is reduced during the reaction and the dissolution assisting effect is weakened, and the two phases are respectively a CO2-loaded rich phase and a CO2-loaded poor phase; desorption is performed only on the CO2-loaded rich phase to obtain CO2; the absorbent after the desorption is mixed with the CO2-loaded poor phase to perform circulation absorption. The method has the advantages that the viscosity of the absorbent is lowered during the absorption, the concentration of the absorbent is increased during the desorption, the treatment quantity of a desorption unit is reduced, water evaporation amount and temperature rising energy consumption are lowered, and the high-viscosity absorbent can be used to separate the CO2 with low energy consumption.

Description

technical field [0001] The invention belongs to the technical field of gas separation and the field of environmental protection, and relates to a method for separating CO by using a high-viscosity absorbent based on the solubilizing effect. 2 Methods. Background technique [0002] The massive emission of carbon dioxide is the main cause of the greenhouse effect and poses a great threat to the living environment of human beings. Therefore, it is necessary to capture carbon dioxide gas. Existing carbon dioxide capture technologies include chemical absorption, physical absorption, membrane separation, adsorption, and biological methods, among which chemical absorption is widely used in industry. Although the chemical absorption method is widely used, it still faces the problem of high regeneration energy consumption. [0003] CO 2 The energy consumption of the regeneration process mainly includes three parts: (1) the reaction heat required for the desorption chemical reacti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14
CPCB01D53/1418B01D53/1425B01D2252/204B01D2252/20421B01D2252/20426B01D2252/20431B01D2252/20436B01D2257/504Y02A50/20Y02C20/40
Inventor 张卫东杨叶金显杭于天然马骞毛梦琳任钟旗
Owner BEIJING UNIV OF CHEM TECH
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