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Electrodialysis regeneration device and method for CO2 trapping amine liquid

An electrodialysis, amine solution technology, applied in electrodialysis, chemical instruments and methods, separation methods, etc., can solve the problems of electrode solution pollution and amine loss, etc., to reduce burden, improve absorption activity and stability, simplify system and effect of operation

Active Publication Date: 2021-07-13
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the deficiency of prior art, provides a kind of new CO 2 The electrodialysis regeneration device for trapping amine liquid uses bipolar membranes, anion exchange membranes, and cation exchange membranes in a specific order to solve the problems of high amine loss and electrode liquid regeneration during the regeneration of amine liquid in existing regeneration devices. and the problem of mutual contamination of different feed liquids

Method used

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  • Electrodialysis regeneration device and method for CO2 trapping amine liquid
  • Electrodialysis regeneration device and method for CO2 trapping amine liquid
  • Electrodialysis regeneration device and method for CO2 trapping amine liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Take 2L of waste amine solution with a concentration of 30wt% new amine solution, degraded MEA concentration of 28.07wt%, containing 3wt% HSS, and a conductivity of 19.84ms / cm, and add it to the fresh water tank after being filtered by a security filter; take 2L of 1mol Add the NaOH solution of / L to the alkaline water tank, get 2L of deionized water and add it to the concentrated water tank, and get 2L of sodium sulfate solution with a concentration of 3wt% and add it to the polar water tank; figure 2 The electrodialysis regeneration device shown in the figure; the circulating water pump is turned on, and the ratio of the flow rate of each feed liquid circulating pump to the flow rate of the anode liquid circulating pump is 5:1. After the flow is stabilized until the circulating flow rate of the membrane surface is 4cm / s, the DC stabilized power supply is turned on, and the control The operating voltage is 20V and the current density is ~30mA / cm 2 . When the conducta...

Embodiment 2

[0053] Take 2L of waste amine solution with a concentration of 30wt% new amine solution, 27.55wt% concentration of MEA after degradation, 3wt% HSS, and 20.68ms / cm conductivity, and add it to the fresh water tank after being filtered by a security filter; take 2L 1mol Add the NaOH solution of / L to the alkaline water tank, get 2L of deionized water and add it to the concentrated water tank, and get 2L of sodium sulfate solution with a concentration of 3wt% and add it to the polar water tank; figure 2 The electrodialysis regeneration device shown in the figure; the circulating water pump is turned on, the flow rate of each feed liquid circulating water pump is 5:1 to the flow rate of the anode liquid circulating water pump, and the DC stabilized power supply is turned on after the flow rate is stabilized until the circulating flow rate of the membrane surface is 4cm / s, and the control The operating voltage is 20V and the current density is ~30mA / cm 2 . When the conductance of ...

Embodiment 3

[0055] Take 2L of waste amine solution with a concentration of 30wt% new amine solution, 28.07% concentration of MEA after degradation, 3wt% HSS, and 19.84ms / cm conductivity, and add the waste amine solution filtered by a security filter into the fresh water tank; take 2L 1mol / cm 1L of NaOH solution is added to the alkaline water tank, 2L of deionized water is added to the concentrated water tank, and 2L of sodium sulfate solution with a concentration of 3wt% is added to the polar water tank; figure 2 The electrodialysis regeneration device shown in the figure; the circulating water pump is turned on, the flow rate of each material liquid circulating water pump is 5:1 to the flow rate of the anode liquid circulating water pump, and the DC stabilized power supply is turned on to control the operation after the flow is stabilized until the circulating flow rate of the membrane surface is 4cm / s Voltage is 25V, current density is ~35mA / cm 2 . When the conductance of the fresh ch...

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Abstract

The invention relates to an electrodialysis regeneration device and method for CO2 trapping amine liquid. A film stack of the device sequentially comprises a bipolar film, a repeated film pair and a first cation exchange film from a cathode plate to an anode plate; each membrane pair in the repeated membrane pairs comprises a second cation exchange membrane, a first anion exchange membrane and a second anion exchange membrane which are arranged in sequence; and preferably, the number of the film pairs in the repeated film pairs is at least two. According to the device, the defects of an electrodialysis film stack device in traditional electrodialysis and current mainstream processes are overcome, alkali metal cations in alkali liquor cannot enter an amine liquid system, solutions in a pole chamber and an adjacent chamber cannot interfere with ion migration, and secondary pollution is avoided. After the device is used for regenerating the CO2 capture amine liquid, the recovery rate of the CO2 capture amine liquid can reach 95% or above, the absorption activity and stability of the amine liquid are greatly improved, and the supply cost of the amine liquid is further reduced.

Description

technical field [0001] The invention belongs to the technical field of amine liquid regeneration, in particular to a CO 2 An electrodialysis regeneration device and method for trapping amine liquid. Background technique [0002] In the fields of desulfurization amine liquid and carbon dioxide capture amine liquid, the most direct way to eliminate thermally stable salts is to use pure amine liquid for replacement. This method is due to the high cost of amine liquid and the waste of waste amine liquid resources. Problems such as and environmental pollution are restricted in use. Therefore, adopting a continuous and stable amine liquid regeneration process is the first choice to solve the heat-stable salt at present. Among the currently explored methods, the more mature ones include distillation, ion exchange, and electrodialysis. Among them, the process of regenerating amine liquid by distillation involves phase change, which consumes a lot of energy. And the removal effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/46B01D61/44B01D61/48B01D53/14B01D53/18
CPCB01D61/46B01D61/445B01D61/485B01D53/1475B01D53/18B01D53/1425B01D2252/204Y02A50/20Y02C20/40
Inventor 李小端赵兴雷熊日华王宝冬
Owner CHNA ENERGY INVESTMENT CORP LTD