Process for removing acidic compounds from gaseous mixtures using a two liquid phase scrubbing solution
First Claim
1. A process for at least partially removing carbon dioxide from a gaseous feed including carbon dioxide comprising:
- (a) contacting the gaseous feed in a contacting zone with a scrubbing solution comprising;
(i) an alkaline material selected from the class consisting of alkali metal salts and alkali metal hydroxides; and
(ii) a sterically hindered amine to thereby at least partially absorb the carbon dioxide from the gaseous feed;
(b) passing the scrubbing solution containing the absorbed carbon dioxide from the contacting zone into a regeneration zone wherein the scrubbing solution is at least partially desorbed;
(c) separating the at least partially desorbed scrubbing solution into an upper liquid phase having a relatively high alkali bicarbonate to alkali carbonate ratio and a lower liquid phase having a relatively low alkali bicarbonate to alkali carbonate ratio; and
,(d) directing at least a portion of the lower liquid phase into the contacting zone at a first location and at least a portion of the upper liquid phase into the contacting zone at a second location, the second location disposed below the first location in the contacting zone.
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Accused Products
Abstract
An improved process for removing carbon dioxide from a gaseous feed including carbon dioxide is described. The carbon dioxide is removed from a gaseous feed by contacting the feed in a contacting zone with a scrubbing solution comprising a sterically hindered amine and an alkali metal salt or alkali metal hydroxide, which at least partially absorbs the carbon dioxide. The scrubbing solution subsequently is desorbed and separated into a two-phase liquid system, an upper phase relatively rich in sterically hindered amine and having a relatively high ratio of alkali bicarbonate to alkali carbonate and a lower liquid phase having a relatively low ratio of alkali bicarbonate to alkali carbonate. The lower liquid phase is returned to the contacting zone at a location above that at which the upper liquid phase is returned to the contacting zone.
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Citations
11 Claims
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1. A process for at least partially removing carbon dioxide from a gaseous feed including carbon dioxide comprising:
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(a) contacting the gaseous feed in a contacting zone with a scrubbing solution comprising; (i) an alkaline material selected from the class consisting of alkali metal salts and alkali metal hydroxides; and (ii) a sterically hindered amine to thereby at least partially absorb the carbon dioxide from the gaseous feed; (b) passing the scrubbing solution containing the absorbed carbon dioxide from the contacting zone into a regeneration zone wherein the scrubbing solution is at least partially desorbed; (c) separating the at least partially desorbed scrubbing solution into an upper liquid phase having a relatively high alkali bicarbonate to alkali carbonate ratio and a lower liquid phase having a relatively low alkali bicarbonate to alkali carbonate ratio; and
,(d) directing at least a portion of the lower liquid phase into the contacting zone at a first location and at least a portion of the upper liquid phase into the contacting zone at a second location, the second location disposed below the first location in the contacting zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A process for at least partially removing CO2 from a gaseous feed including CO2 comprising:
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(a) contacting the gaseous feed in an absorber with a scrubbing solution comprising; (i) about 3 to about 15 wt.% of a sterically hindered amine; (ii) about 15 to about 35 wt.% of an alkaline material selected from the class consisting of alkali metal salts and alkali metal hydroxides; and (iii) about 50 to about 80 wt.% of water to thereby at least partially absorb the acidic compound; (b) passing the scrubbing solution containing the absorbed CO2 from the absorber into a regenerator wherein the scrubbing solution is at least partially desorbed; (c) passing the at least partially desorbed scrubbing solution from the regenerator into a reboiler, wherein the at least partially desorbed scrubbing solution is separated into an upper liquid phase relatively rich in sterically hindered amine and having a relatively high ratio of alkali bicarbonate to carbonate ratio and a lower liquid phase having a relatively low ratio of alkali bicarbonate to carbonate ratio; and (d) directing at least a portion of the lower liquid phase from the reboiler into the absorber at a first location and directing at least a portion of the upper liquid phase from the reboiler into the absorber at a second location, the second location disposed below the first location.
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Specification