Cansolv Technologies Inc was Granted Patent For Regeneration Of Ion Exchangers That Are Used For Salt Removal From Acid Gas Capture Plants Published By Indian Patent Office On 02/10/2015 U/S 43(2) Of The Indian Patent Act, Indian Patent News, #Indiapatent
According to the Controller General of Patents, Designs & Trade Marks the disclosure provides a process to regenerate an ion exchanger used to capture salts from a solution. In accordance with another aspect, this invention relates to the integration of an ion exchange process with an acid gas capture process. In a particularly preferred embodiment, the acid gas that is captured comprises one or more of sulfur dioxide, hydrogen sulfide and carbon dioxide.
Indian Patent Claims
1.A method for the removal of an amine captureable gas from a feed gas stream using an amine solvent, the method comprising: a) contacting the feed gas stream with a lean amine solvent to form a rich amine solvent, wherein heat stable salts are present in the rich amine solvent; b) stripping amine captureable gas from the rich amine solvent to form the lean amine solvent and an overhead reflux stream; c) periodically contacting at least a portion of one or both of the lean amine solvent and the rich amine solvent with an anion exchange resin to form a first heat stable salt lean amine solvent; d) periodically regenerating the anion exchange resin, wherein during the regeneration of the anion exchange resin, at least a portion of the reflux stream is used to wash the amine solvent from the anion exchange resin to produce a second heat stable salt lean amine solvent; and, e) recycling the at least a portion of the first and second heat stable salt lean amine solvent for use in capturing the amine captureable gas from the feed gas.
2.The method of claim 1 further comprising selecting the amine captureable gas from one or more of SO2, H2S and CO2.
3.The method of any of claims 1 and 2 further comprising selecting the lean amine solvent as the amine solvent that is contacted with the anion exchange resin.
4The method of any of claims 1 – 3 wherein during step (d), the anion exchange resin is treated to remove the amine solvent therefrom prior to regenerating the anion exchange resin.
5.The method of any of claims 1 – 4 wherein step (d) comprises: a) the anion exchange resin is contacted with water to wash amine solvent from the anion exchange resin; b) the anion exchange resin is subsequently contacted with a regeneration agent to obtain regenerated anion exchange resin and spent regeneration agent solution; and,mc) washing the anion exchange resin with water to remove the regeneration agent therefrom and to obtain a regeneration agent wash effluent.
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