HIGH CYCLIC CAPACITY AMINES FOR HIGH EFFICIENCY CO2 SCRUBBING PROCESSES
First Claim
1. A high cyclic capacity carbon dioxide scrubbing process which comprises:
- (i) contacting a gas stream containing carbon dioxide in a sorption zone with an aqueous liquid scrubbing solution of a sterically hindered secondary amine at a total secondary amine concentration of at least 3.5M and at a temperature of at least 10°
C. to sorb the carbon dioxide into the amine solution and form a rich stream of the sorbed carbon dioxide in the amine solution in the form of amine carbamate and/or amine bicarbonate dissolved in the solution;
(ii) passing the rich stream from the sorption zone to at least one regeneration zone and desorbing the sorbed carbon dioxide as gas from the amine solution to form a lean solution containing a reduced concentration of sorbed carbon dioxide relative to the rich stream; and
(iii) returning the lean stream to the sorption zone.
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Accused Products
Abstract
A high cyclic capacity carbon dioxide scrubbing process contacts a gas stream containing carbon dioxide in a sorption zone with a liquid scrubbing solution of a low molecular weight sterically hindered amine, particularly a secondary alkanolamine or aminoether at a high concentration, typically at least 3.5M and at a temperature of at least 30° C. to sorb the carbon dioxide into the solution and form a rich stream of the sorbed carbon dioxide in the solution in the form of dissolved amine carbamate and/or alkanolamine bicarbonate. The rich stream is then passed from the sorption zone to at least one regeneration zone and the sorbed carbon dioxide is desorbed as gas from the solution to form a lean solution containing a reduced concentration of sorbed carbon dioxide relative to the rich stream; the lean stream is then returned to the sorption zone for a further sorption cycle.
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Citations
41 Claims
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1. A high cyclic capacity carbon dioxide scrubbing process which comprises:
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(i) contacting a gas stream containing carbon dioxide in a sorption zone with an aqueous liquid scrubbing solution of a sterically hindered secondary amine at a total secondary amine concentration of at least 3.5M and at a temperature of at least 10°
C. to sorb the carbon dioxide into the amine solution and form a rich stream of the sorbed carbon dioxide in the amine solution in the form of amine carbamate and/or amine bicarbonate dissolved in the solution;(ii) passing the rich stream from the sorption zone to at least one regeneration zone and desorbing the sorbed carbon dioxide as gas from the amine solution to form a lean solution containing a reduced concentration of sorbed carbon dioxide relative to the rich stream; and (iii) returning the lean stream to the sorption zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A high cyclic capacity carbon dioxide scrubbing process which comprises:
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(i) contacting a flue gas from a hydrocarbon combustion process containing carbon dioxide in an sorption zone with an aqueous liquid alkanolamine scrubbing solution of 2-N-methylamino-1-propanol at a total concentration of 2-N-methylamino-1-propanol of at least 4.0M of the alkanolamine and at a temperature of at least 30°
C. and a pressure of at least 0.025 bar to sorb the carbon dioxide from the flue gas into the amine solution and form a rich stream of the sorbed carbon dioxide in the amine solution in the form of alkanolamine carbamate and/or alkanolamine bicarbonate dissolved in the amine solution;(ii) passing the rich amine stream from the sorption zone to a regeneration zone and desorbing the sorbed carbon dioxide as gas from the alkanolamine solution to form a lean solution containing a reduced concentration of sorbed carbon dioxide relative to the rich stream and regenerated 2-N-methylamino-1-propanol; and (iii) returning the lean stream to the sorption zone. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40)
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41. A high cyclic capacity carbon dioxide scrubbing process which comprises:
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(i) contacting a natural gas stream containing carbon dioxide in an sorption zone with an aqueous liquid alkanolamine scrubbing solution of 2-N-methylamino-1-propanol at a total concentration of 2-N-methylamino-1-propanol of at least 4.0M of the alkanolamine and at a temperature of at least 30°
C. and a pressure of at least 0.025 bar to sorb the carbon dioxide from the natural gas stream into the amine solution and form a rich stream of the sorbed carbon dioxide in the amine solution in the form of alkanolamine carbamate and/or alkanolamine bicarbonate dissolved in the amine solution;(ii) passing the rich amine stream from the sorption zone to a regeneration zone and desorbing the sorbed carbon dioxide as gas from the alkanolamine solution to form a lean solution containing a reduced concentration of sorbed carbon dioxide relative to the rich stream and regenerated 2-N-methylamino-1-propanol, which comprises (a) sending the rich amine solution to a first regeneration zone flash drum, where carbon dioxide is desorbed from the rich amine solution to form a first intermediate desorbed solution; (b) sending the first intermediate desorbed solution to a stripping zone in which it is contacted, directly or indirectly, with a stripping medium to desorb further carbon dioxide from the first intermediate desorbed solution, thus forming a second intermediate desorbed solution; and (c) optionally sending the second intermediate desorbed solution to a second regeneration flash drum, where still further carbon dioxide is desorbed from the second intermediate desorbed solution, thus forming a third intermediate desorbed solution, wherein the lean stream is comprised of the second intermediate desorbed solution and/or the optional third intermediate desorbed solution; and (iii) returning the lean stream to the sorption zone.
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Specification