Process for the regeneration of an ion exchange resin using sulfurous acid
First Claim
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1. A process for the regeneration of an acidic cation exchange resin used to treat an acid gas absorbent stream comprising at least one alkali metal salt, the process comprising:
- (a) obtaining the acid gas absorbent stream from an acid gas recovery unit;
(b) contacting the acid gas absorbent stream with an acidic cation exchange resin and generating a cation reduced acid gas absorbent stream; and
,(c) regenerating the acidic cation exchange resin using a sulfurous acid reflux obtained from the acid gas recovery unit and producing a spent regeneration streamwherein step (c) comprises a single chemical treatment step.
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Abstract
A diamine absorbent that contains heat stable salts is regenerated using an ion exchange process wherein the cation exchange resin is regenerated using sulfurous acid reflux.
16 Citations
21 Claims
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1. A process for the regeneration of an acidic cation exchange resin used to treat an acid gas absorbent stream comprising at least one alkali metal salt, the process comprising:
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(a) obtaining the acid gas absorbent stream from an acid gas recovery unit; (b) contacting the acid gas absorbent stream with an acidic cation exchange resin and generating a cation reduced acid gas absorbent stream; and
,(c) regenerating the acidic cation exchange resin using a sulfurous acid reflux obtained from the acid gas recovery unit and producing a spent regeneration stream wherein step (c) comprises a single chemical treatment step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 14, 15, 17, 20)
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12. A process for the regeneration of an acidic cation exchange resin used to treat an acid gas absorbent stream comprising at least one alkali metal salt, the process comprising:
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(a) obtaining the acid gas absorbent stream from an acid gas recovery unit; (b) contacting the acid gas absorbent stream with an acidic cation exchange resin and generating a cation reduced acid gas absorbent stream; and
,(c) regenerating the acidic cation exchange resin using a sulfurous acid reflux obtained from the acid gas recovery unit and producing a spent regeneration stream wherein the spent regeneration stream comprises a first portion and a second portion and the process further comprises recycling only the first portion of the spent regeneration stream to the acid gas recovery unit for use as part of an acid gas absorption solution and wherein the acid gas absorbent stream comprises a diamine absorbent and the first portion of the spent regeneration stream has a diamine concentration of about 1000 ppm to about 30000 ppm.
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13. A process for the regeneration of an acidic cation exchange resin used to treat an acid gas absorbent stream comprising at least one alkali metal salt, the process comprising:
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(a) obtaining the acid gas absorbent stream from an acid gas recovery unit; (b) contacting the acid gas absorbent stream with an acidic cation exchange resin and generating a cation reduced acid gas absorbent stream; and
,(c) regenerating the acidic cation exchange resin using a sulfurous acid reflux obtained from the acid gas recovery unit and producing a spent regeneration stream wherein the spent regeneration stream comprises a first portion and a second portion and the process further comprises recycling only the first portion of the spent regeneration stream to the acid gas recovery unit for use as part of an acid gas absorption solution and wherein the second portion of the spent regeneration stream comprises alkali metal salts having a concentration of about 250 ppm to about 7000 ppm and the second portion is directed to waste treatment.
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16. A process for the regeneration of an acidic cation exchange resin used to treat an acid gas absorbent stream comprising at least one alkali metal salt, the process comprising:
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(a) obtaining the acid gas absorbent stream from an acid gas recovery unit; (b) contacting the acid gas absorbent stream with an acidic cation exchange resin and generating a cation reduced acid gas absorbent stream; and
,(c) regenerating the acidic cation exchange resin using a sulfurous acid reflux obtained from the acid gas recovery unit and producing a spent regeneration stream wherein a sufficient amount of sulfurous acid reflux is utilized to regenerate the acidic cation exchange resin that the acidic cation exchange resin is ready for use to treat an additional amount of the acid gas absorbent stream in the absence of a final water rinse.
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18. A process for the regeneration of an acidic cation exchange resin used to treat an acid gas absorbent stream comprising at least one alkali metal salt, the process comprising:
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(a) obtaining the acid gas absorbent stream from an acid gas recovery unit; (b) contacting the acid gas absorbent stream with an acidic cation exchange resin and generating a cation reduced acid gas absorbent stream; and
,(c) regenerating the acidic cation exchange resin using a sulfurous acid reflux obtained from the acid gas recovery unit and producing a spent regeneration stream wherein the acid gas absorbent stream comprises a diamine absorbent having a concentration of heat stable salts that is less than 1 equivalent/mole of diamine. - View Dependent Claims (19)
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21. A process for the regeneration of an acidic cation exchange resin used to treat an acid gas absorbent stream comprising at least one alkali metal salt, the process comprising:
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(a) obtaining the acid gas absorbent stream from an acid gas recovery unit; (b) contacting the acid gas absorbent stream with an acidic cation exchange resin and generating a cation reduced acid gas absorbent stream; (c) regenerating the acidic cation exchange resin using a sulfurous acid reflux obtained from the acid gas recovery unit and producing a spent regeneration stream; and
,(d) contacting the acid gas absorbent stream with a basic anion exchange resin in the hydroxide form and generating an anion lean acid gas absorbent stream and using at least a portion of the anion lean acid gas absorbent stream in step (b) wherein the portion of the anion lean acid gas absorbent stream used in step (b) has a concentration of heat stable salts that is less than 1 equivalent/mole of diamine.
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Specification