Method for the removal of heat stable amine salts from an amine absorbent
a technology of heat stable amine salts and absorbents, which is applied in the direction of fluid pressure measurement, liquid/fluent solid measurement, peptides, etc., can solve the problems of significant amine loss through the reclamation waste stream, and the detrimental effect of cosub>2/sub>in the amine absorbent of the separation process
Inactive Publication Date: 2012-09-20
GENERAL ELECTRIC TECH GMBH +1
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Benefits of technology
[0008]It is an object of the present invention to provide an improved system and process for removal of heat stable salts (HSS) from an amine absorbent stream used in a carbon dioxide (CO2) capture process.
Problems solved by technology
It has been found, however, that CO2 in the amine absorbent can be detrimental to the separation process, such as electrodialysis.
It has been found that when a slip stream of the lean solvent is sent to the reclamation unit, either electrodialysis or ion exchange, the relatively high lean loading fed to the reclamation unit results in significant quantities of amine lost through the reclamation waste stream.
Method used
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Amine Loss into the Waste Brine Stream of the Electrodialysis Unit
[0073]Amine losses from a lean amine absorbent into the waste brine of a 3-loop ElectroSep electrodialysis unit (ElectroSep Inc., USA) was evaluated with various CO2 loadings in the lean amine absorbent. 1.2 and 1.4 wt % amine was observed in the waste brine stream when the lean amine absorbent had CO2 loadings of 2.2 and 2.9 wt % CO2, respectively. Only 0.3 wt % amine was observed in the waste brine stream with 0.01 wt % CO2 in the lean amine absorbent. This represents a 75-80% reduction in amine losses compared to the higher lean loadings. This example shows that a significant reduction of amine losses can be achieved by reduction of the CO2 loading of the lean amine absorbent, e.g. by stipping or flashing, prior to feeding it to a reclaimer unit, such as a electrodialysis unit.
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Abstract
The proposed invention relates to a method and a system for the removal of heat stable amine salts from an amine absorbent used in a carbon dioxide (CO2) capture process, the method comprising: withdrawing amine absorbent containing heat stable amine salts from the CO2 capture process; subjecting the withdrawn amine absorbent containing heat stable amine salts to a residual CO2 removal step; subjecting the amine absorbent from the residual CO2 removal step to a separation step to separate heat stable amine salts from the amine absorbent; and returning the amine absorbent having a reduced concentration of heat stable amine salts to the CO2 capture process.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims the benefit under 35 U.S.C. §119(e) of Provisional Patent Application Ser. No. 61 / 454,079 entitled “METHOD FOR THE REMOVAL OF HEAT STABLE AMINE SALTS FROM AN AMINE ABSORBENT” filed Mar. 18, 2011, the disclosure of which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]The proposed invention relates to a system and a method for the removal of heat stable amine salts from an amine absorbent used in a carbon dioxide (CO2) capture process.BACKGROUND[0003]In the combustion of a fuel, such as coal, oil, natural gas, peat, waste, etc., in a combustion plant, such as those associated with boiler systems for providing steam to a power plant, a hot process gas (or flue gas) is generated. Such a flue gas will often contain, among other things, carbon dioxide (CO2). The negative environmental effects of releasing carbon dioxide to the atmosphere have been widely recognized, and have result...
Claims
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IPC IPC(8): C09K3/00B01J19/08C25B7/00B01J19/00C01B32/50
CPCB01D53/1425B01D53/1475B01D2252/20484B01D2252/20489B01D2257/504C07C209/84Y02C10/06Y02C10/08Y02C10/04B01D61/42B01D2258/0283B01J47/00Y02C20/40Y02A50/20B01D53/1493B01D61/422B01D2252/204B01D2259/4009
Inventor HANDAGAMA, NARESHKUMAR B.BABURAO, BARATHVITSE, FREDERICBEDELL, STEPHEN A.LEISTER, JONATHAN W.DUGAS, ROSS
Owner GENERAL ELECTRIC TECH GMBH
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