CN-122006479-A - Decarbonizing amine liquid electrodialysis desalination purification regeneration method

Abstract

The application discloses a decarbonization amine liquid electrodialysis desalination purification regeneration method. The method for the electrodialysis desalination purification regeneration of the decarbonization amine liquid comprises the following steps of pretreating the decarbonization amine liquid to obtain a pretreatment solution, and carrying out electrodialysis purification treatment on the pretreatment solution. The method for the electrodialysis desalination purification regeneration of the decarbonization amine liquid combines the ideas of electrodialysis and a membrane contactor assembly, and realizes the decolorization purification of the decarbonization amine liquid and the efficient recovery of the amine.

Inventors

• MENG RUIHONG
• YU FANG
• WANG YULONG
• DU SHUMING
• XU DONG
• YANG YANG
• YU XUEHAI
• GAO KAI
• Fan tengfei
• LI LIWEN
• LIU XINTIAN

Assignees

• 国家能源集团新能源技术研究院有限公司

Dates

Publication Date

20260512

Application Date

20260109

Claims (10)

1. 1. The method for desalting, purifying and regenerating the decarbonized amine liquid by electrodialysis is characterized by comprising the following steps of: Pretreating decarbonization amine liquid to obtain a pretreatment solution; And carrying out electrodialysis purification treatment on the pretreatment solution.
2. 2. The method for electrodialytic desalination purification regeneration of a decarbonization amine solution according to claim 1, wherein the pretreatment comprises the step of filtering the decarbonization amine solution to remove solid particulate impurities from the decarbonization amine solution.
3. 3. The decarbonizing amine liquid electrodialysis desalination purification regeneration method according to claim 2, wherein at least one of the following conditions is satisfied: (1) The pretreatment comprises the following steps of filtering the decarbonized amine liquid through a filter, wherein the filter diameter of a filter element of the filter is 5-10 mu m; (2) And controlling the temperature of the decarbonizing amine liquid to be 40-60 ℃ during pretreatment.
4. 4. The method for electrodialytic desalination purification regeneration of decarbonized amine liquid according to claim 1, wherein an electrodialysis device is adopted in the electrodialysis purification treatment, and the electrodialysis device comprises an electrodialysis cell, and anode electrodes, a first separator, a membrane contactor assembly, a second separator and cathode electrodes which are arranged in the electrodialysis cell from anode to cathode.
5. 5. The method for electrodialysis desalination purification regeneration of decarbonized amine liquid according to claim 4, wherein the membrane contactor assembly comprises a shell tube, a membrane bundle positioned in the shell tube and a packaging component, wherein the membrane bundle comprises a plurality of fiber membrane wires, the fiber membrane wires extend along the length direction of the shell tube, and outer walls of two end positions of the adjacent fiber membrane wires are fixedly connected to the shell tube through the packaging component and are in sealing fit with the shell tube.
6. 6. The method for electrodialytic desalination purification regeneration of a decarbonized amine solution according to claim 5, wherein the fiber membrane filaments comprise hollow fiber anion exchange membranes; Optionally, the preparation materials of the fiber membrane filaments comprise one or two of quaternized polysulfone and polyvinyl benzyl chloride; and/or the number of the fiber membrane filaments is 100-2000.
7. 7. The method for electrodialytic desalination purification regeneration of a decarbonized amine solution according to claim 5, wherein the electrodialysis device satisfies at least one of the following conditions: (1) The preparation material of the shell pipe comprises one or two of polyvinylidene fluoride and polypropylene; (2) The preparation material of the packaging component comprises one or two of epoxy resin and polyurethane adhesive.
8. 8. The method for electrodialytic desalination purification regeneration of a decarbonized amine solution according to any one of claims 4 to 7, wherein the first separator and the second separator each independently comprise an ion exchange membrane or a porous plate.
9. 9. The method for electrodialysis desalination, purification and regeneration of a decarbonization amine solution according to any one of claims 4 to 7, wherein the electrodialysis device satisfies at least one of the following conditions: (1) The anode electrode comprises titanium ruthenium-coated iridium; (2) The cathode electrode comprises stainless steel.
10. 10. The method for electrodialysis desalination, purification and regeneration of a decarbonization amine solution according to any one of claims 1 to 7, further comprising the steps of: (1) Delivering the purified amine liquid obtained by electrodialysis purification treatment to a storage tank for storage; (2) Evaporating, crystallizing and/or biochemically treating the concentrated waste liquid obtained by the electrodialysis purification treatment; (3) And discharging the electrode wastewater generated by the electrodialysis purification treatment or sending the electrode wastewater to a sewage treatment system for treatment.

Description

Decarbonizing amine liquid electrodialysis desalination purification regeneration method Technical Field The application relates to the technical field of chemistry and purification, in particular to a decarbonization amine liquid electrodialysis desalination purification regeneration method. Background With the deep advancement of "carbon peaking, carbon neutralization", carbon capture, utilization and sequestration (CCUS) technology has become a key way to reduce industrial carbon emissions. Among them, post-combustion trapping technology based on amine chemisorption is currently the most mature and widely used solution. However, amine solutions have a serious common problem of degradation and volatilization during long-term recycling. Decarbonizing amine liquid such as MEA, MDEA and the like needs to be desorbed and regenerated at high temperature after absorbing CO 2, and impurities such as O 2、SOX、NOX and the like inevitably exist in the process and the system, so that amine molecules are subjected to oxidation, thermal degradation and chemical degradation to generate a series of thermally stable salts (HeatStableSalts, HSS) and macromolecular organic degradation products. The heat stable salts such as formate, acetate, sulfate, oxalate and the like can not be continuously accumulated in the system due to the fact that anions and amine molecules form strong ionic bonds and can not be decomposed by heating in a conventional regeneration tower, so that the accumulation of degradation products can not only reduce the absorption capacity and reaction kinetics of the amine liquid, and the energy consumption of the system is increased, but also cause equipment corrosion, foaming of the amine liquid and serious coloring (changing into dark brown or blue black) of the amine liquid solution, and the discoloration of the amine liquid solution is an visual sign of performance degradation of the amine liquid solution, and also predicts the reduction of the running reliability and economy of the whole system. For HSS and degradation products removal in alcohol amine solutions, methods in the conventional art mainly include ion exchange methods, electrodialysis (ED), and the like. The ion exchange method realizes the purification purpose by adsorbing the HSS in the solution by the resin, and has the advantages of mature technology and higher removal efficiency, but the resin needs to be frequently chemically regenerated by strong acid and strong alkali to generate a large amount of high-salt wastewater, and the treatment cost is high. Electrodialysis is driven by the action of an electric field, and HSS anions and metal cations are directionally migrated by utilizing the selectivity of an ion exchange membrane and separated from amine liquid. Electrodialysis has the advantages of no need of adding chemicals, continuous operation and good effect of removing ionic pollutants, but has the problems that organic matters and colloid matters in amine liquid are easy to cause membrane pollution, the efficiency is reduced and the like. It can be seen that the prior art generally has the problems of high energy consumption, secondary pollution, discontinuous process or specific pollutant only, and lacks a comprehensive solution capable of synchronously, efficiently and deeply purifying the amine liquid in green lands. Disclosure of Invention Based on the above, it is necessary to provide a decarbonization amine solution electrodialysis desalination purification regeneration method capable of efficiently, economically and environmentally removing HSS and degradation products and realizing on-line purification and regeneration of amine solution. The application provides a decarbonization amine liquid electrodialysis desalination purification regeneration method. The decarbonization amine liquid electrodialysis desalination purification regeneration method comprises the following steps: Pretreating decarbonization amine liquid to obtain a pretreatment solution; And carrying out electrodialysis purification treatment on the pretreatment solution. In some embodiments, the pretreatment includes the step of filtering the decarbonated amine solution to remove solid particulate impurities from the decarbonated amine solution. In some embodiments, the pretreatment comprises the step of filtering the decarbonized amine liquid through a filter, wherein the filter core of the filter has a filtration diameter of 5-10 mu m. In some embodiments, the temperature of the decarbonization amine liquid is controlled to be 40-60 ℃ during pretreatment. In some embodiments, the electrodialysis purification treatment uses an electrodialysis device, and the electrodialysis device comprises an electrodialysis cell, and anode electrodes, a first separator, a membrane contactor assembly, a second separator and cathode electrodes, wherein the anode electrodes, the first separator, the membrane contactor assembly, the second separator and the cathode electr