Method for removing HSS in DETA carbon capture process through three-compartment electrodialysis
A technology of electrodialysis and carbon capture, applied in electrodialysis, chemical instruments and methods, organic chemistry, etc., can solve the problems of large consumption of organic alcohol amines, unfavorable amine cycle regeneration, and poor purification effect of basic ion exchange resins , to achieve the effects of low energy consumption, high desalination rate and high amine recovery rate
Active Publication Date: 2021-03-16
ZHEJIANG UNIV OF TECH
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Problems solved by technology
Although this method can remove part of sulfate and fluoride ions, it consumes a lot of organic alcohol amines, which is not conducive to the recycling of amines; patent CN103127745A uses anion exchange resins to remove thermally stable salts in organic alcohol amines. A certain effect has been achieved, but the purification effect on the basic ion exchange resin is poor, and the process of regenerating the resin is cumbersome
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[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. The operating methods not indicated in the following examples are generally in accordance with conventional conditions, or in accordance with the conditions suggested by the manufacturer.
[0028] The device for electrodialysis removal of complex thermally stable salts in organic amines in the carbon capture process of the present invention and the internal structure of the membrane stack are shown as follows figure 1 shown. The partition is a rubber frame and a polypropylene inner mesh. The anion exchange membrane is the A1Rnw85 alkali-resistant membrane of Shandong Tianwei Membrane Technology Co., Ltd. The cation exchange membrane is the C1Rnw85 alkali-resistant membrane of Shandong T...
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Abstract
The invention discloses a method for removing HSS in the DETA carbon capture process through three-compartment electrodialysis. An electrodialysis device comprising a material chamber, an alkali chamber, a salt chamber and a pole chamber is used; a decarburized sulfate-containing organic amine solution is used as a feed liquid, an alkali liquid is a sodium hydroxide solution, a salt liquid is deionized water, a polar liquid is an electrolyte solution of sodium sulfate, and the solutions are pumped into electrodialysis devices of a plurality of membrane units through a centrifugal pump. Under the action of an external electric field, heat-stable anions in the feed liquid are migrated into the salt chamber through an anion exchange membrane to be discharged, meanwhile, hydroxide ions in thealkali chamber enter the material chamber through the anion exchange membrane, bound protonated amine is converted into free amine, and therefore regeneration of organic amine is achieved.
Description
technical field [0001] The invention relates to the field of desalination of thermally stable salts in diethylenetriamine absorption liquids in coal-fired power plants, in particular to a three-compartment electrodialysis method for removing HSS in the process of DETA carbon capture. Background technique [0002] Global warming has become a severe challenge facing all mankind. Among the many carbon emission reduction schemes, CO 2 Capture and storage technology (CCS) is an important means for coal-fired power plants to achieve effective carbon emission reduction. Solvent method is currently the main carbon capture method. Diethylenetriamine (DETA) is widely used in desulfurization and decarbonization in coal-fired power plants. It has fast absorption capacity, strong regeneration capacity, and high solvent reuse times. СО 2 The advantages of high selectivity, become the power plant to capture CO 2 The more prominent absorbing solvents in the process. [0003] in CO 2 A...
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Login to View More IPC IPC(8): B01D61/42B01D61/48B01D61/52B01D61/54C07C209/84C07C211/14
CPCB01D61/422B01D61/485B01D61/52B01D61/54C07C209/84C07C211/14
Inventor 任明杰霍超
Owner ZHEJIANG UNIV OF TECH