CN-121988132-A - CO capture2Polyamine composite absorbent and regeneration method thereof

CN121988132ACN 121988132 ACN121988132 ACN 121988132ACN-121988132-A

Abstract

The application provides a polyamine composite absorbent for capturing CO 2 and a regeneration method thereof, and relates to the technical fields of resource environment and chemical industry. The polyamine composite absorbent comprises tetrazaadamantane and derivatives, an auxiliary agent and an organic solvent, wherein the tetrazaadamantane and derivatives contain active amine groups. According to the application, the active amine group is introduced into the tetraazaadamantane, and the selectivity and the absorption efficiency of CO 2 are improved through the steric effect, so that the reaction has more reversible and thermodynamic advantages. Therefore, the absorption and desorption of CO 2 can be realized at a lower temperature, the whole energy consumption is reduced, and the circulating efficiency of the polyamine composite absorbent is improved.

Inventors

ZHANG CONGYUN
WANG SHANSHAN
NAN XUERI
YANG MENG
LIU RUI
HE FANG
ZHAO YANG
SUN YE
CHU HAIQIANG
CUI HAIBIN

Assignees

北京迪威尔石油天然气技术开发有限公司
中国石油工程建设有限公司
中国石油天然气集团有限公司

Dates

Publication Date: 20260508
Application Date: 20241104

Claims (10)

1. A polyamine composite absorbent is characterized by comprising tetrazaadamantane, a derivative, an auxiliary agent and an organic solvent, wherein the tetrazaadamantane and the derivative contain active amine groups.
2. The polyamine composite absorbent according to claim 1, wherein the content of the tetraazaadamantane and derivatives is 20wt% to 79wt%, the content of the auxiliary agent is 0.01wt% to 5wt%, and the content of the organic solvent is 20wt% to 75wt%.
3. The polyamine composite absorbent according to claim 1 or 2, wherein the tetraazaadamantane and derivative are selected from one of the following structural formulas, or a mixture of a plurality of the structural formulas in an arbitrary ratio:
4. The polyamine composite absorbent according to claim 1 or 2, wherein the auxiliary agent is selected from one or more of defoamer, antioxidant and corrosion inhibitor.
5. The polyamine composite absorbent according to claim 4, wherein the defoamer is selected from one or more of polysiloxane, fluorine-containing polysiloxane, polyether modified polysiloxane and polyoxyethylene ether, the antioxidant is selected from one or more of hindered phenol antioxidant, aromatic amine antioxidant and ascorbic acid, and the corrosion inhibitor is selected from one or more of organic imidazolines, pyridinium quaternary ammonium salts, inorganic nitrite, tungstate, molybdate and vanadate.
6. The polyamine composite absorbent according to claim 1 or 2, wherein the organic solvent is selected from sulfolane, piperazine, triazine, polyethylene polyamine, ethylene glycol dimethyl ether, ethylene glycol monomethyl ether, ethylene glycol diethyl ether, a mixture of one or more of ethylene glycol monoethyl ether in any proportion, or an aqueous solution of a mixture of one or more of sulfolane, piperazine, triazine, polyethylene polyamine, ethylene glycol dimethyl ether, ethylene glycol monomethyl ether, ethylene glycol diethyl ether, ethylene glycol monoethyl ether in any proportion.
7. A method for regenerating a polyamine composite absorbent, the method comprising: Inputting the prepared raw material gas processed by the flue gas bypass system to the bottom of an absorption tower operated under a first set condition, wherein the first set condition comprises temperature and pressure, the value range of the temperature is 40-60 ℃, and the value range of the pressure is 0.1-10 MPa; Inputting a target composite absorbent into the top of the absorption tower, wherein the target composite absorbent and the raw material gas form countercurrent contact to obtain a rich liquid, the rich liquid is the target composite absorbent after absorbing CO 2 , and the target composite absorbent is the polyamine composite absorbent according to any one of claims 1 to 6; Carrying out heat exchange on the rich liquid and lean liquid flowing out from the bottom of the regeneration tower through a heat exchanger, and preheating the rich liquid, wherein the lean liquid is a target composite absorbent after CO 2 is desorbed; And inputting the preheated rich liquid to the top of a regeneration tower operated under a second set condition to obtain a regenerated target composite absorbent, wherein the regenerated target composite absorbent is lean liquid, the second set condition comprises temperature and pressure, the value range of the temperature is 90-130 ℃, and the value range of the pressure is 0.1-0.4 MPa.
8. The regeneration method according to claim 7, wherein the target composite absorbent is a dilution of the polyamine composite absorbent.
9. The regeneration method according to claim 8, wherein the mass concentration of the polyamine composite absorbent in the diluent is 20% -79%.
10. The regeneration method according to claims 7 to 9, characterized in that the volume ratio of the polyamine complex absorbent to CO 2 in the feed gas is 100 (0.1 to 80).

Description

Polyamine composite absorbent for capturing CO 2 and regeneration method thereof Technical Field The application relates to the technical fields of resource environment and chemical industry, in particular to a polyamine composite absorbent for capturing CO 2 and a regeneration method thereof. Background The flue gas of the coal-fired power plant, natural gas, refinery gas, cement plant and nitrogen fertilizer plant all contain different amounts of CO 2, and taking the flue gas of the coal-fired power plant as an example, the flue gas of the coal-fired power plant is a solid particulate matter, liquid and gaseous mixture containing multiple components, and the main components of the flue gas of the coal-fired power plant are nitrogen, carbon dioxide, oxygen which is not completely combusted, oxides and sulfides of nitrogen and the like. The oxides and sulfides of nitrogen are generally regarded as harmful substances, and carbon dioxide can be effectively utilized as raw materials for chemical production, and can be collected and stored by advanced trapping technology to reduce the influence of the carbon dioxide on the environment. At present, a chemical absorption method is generally used to capture carbon dioxide, and in particular, a solution of methyldiethanolamine (Methyldiethanolamine, abbreviated as MDEA) is used as an absorbent to capture carbon dioxide. Specifically, when the MDEA solution is contacted with a gas containing CO 2, CO 2 dissolves in the solution and chemically reacts with the MDEA to form a reversible bicarbonate or carbonate salt. This reaction causes the transfer of CO 2 from the gas phase to the liquid phase, thereby effecting the purification of the gas and the capture of CO 2. However, this approach still requires more energy to effect desorption of CO 2. Disclosure of Invention The application provides a polyamine composite absorbent for capturing CO 2 and a regeneration method thereof, which are used for achieving the effect of desorbing CO 2 with lower energy consumption. In a first aspect, the application provides a polyamine composite absorbent comprising tetraazaadamantane and derivatives, an auxiliary agent and an organic solvent, wherein the tetraazaadamantane and derivatives contain active amine groups. In an alternative embodiment, the content of the tetrazaadamantane and the derivatives is 20-79 wt%, the content of the auxiliary agent is 0.01-5 wt%, and the content of the organic solvent is 20-75 wt%. In an alternative embodiment, the tetrazaadamantane and derivatives are selected from one of the following structural formulas, or a mixture of a plurality of the structural formulas in any ratio: In an alternative embodiment, the auxiliary agent is selected from one or more of defoamers, antioxidants and corrosion inhibitors. In an alternative embodiment, the defoamer is selected from one or more of polysiloxane, fluorine-containing polysiloxane, polyether modified polysiloxane and polyoxyethylene ether, the antioxidant is selected from one or more of hindered phenol antioxidant, aromatic amine antioxidant and ascorbic acid, and the corrosion inhibitor is selected from one or more of organoimidazolines, pyridinium quaternary ammonium salts, inorganic nitrite, tungstate, molybdate and vanadate. In an alternative embodiment, the organic solvent is selected from the group consisting of sulfolane, piperazine, triazine, polyethylene polyamine, ethylene glycol dimethyl ether, ethylene glycol monomethyl ether, ethylene glycol diethyl ether, a mixture of one or more of ethylene glycol monoethyl ether in any proportion, or an aqueous solution of one or more of sulfolane, piperazine, triazine, polyethylene polyamine, ethylene glycol dimethyl ether, ethylene glycol monomethyl ether, ethylene glycol diethyl ether, ethylene glycol monoethyl ether in any proportion. In a second aspect, the present application provides a method for regenerating a polyamine composite absorbent, the method comprising: Inputting the prepared raw material gas processed by the flue gas bypass system to the bottom of an absorption tower operated under a first set condition, wherein the first set condition comprises temperature and pressure, the value range of the temperature is 40-60 ℃, and the value range of the pressure is 0.1-10 MPa; Inputting a target composite absorbent into the top of an absorption tower, and enabling the target composite absorbent to form countercurrent contact with raw gas to obtain rich liquid, wherein the rich liquid is the target composite absorbent after absorbing CO 2, and the target composite absorbent is the polyamine composite absorbent described in the first aspect and/or various possible implementation manners of the first aspect; Carrying out heat exchange on the rich liquid and lean liquid flowing out from the bottom of the regeneration tower through a heat exchanger, preheating the rich liquid, wherein the lean liquid is the target composite absorbent after CO 2 is deso