PROCESS FOR THE RECOVERY OF CARBON DIOXIDE FROM A GAS STREAM
First Claim
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1. A process for recovering CO2 from a feed gas stream comprising:
- a. treating the feed gas stream with a regenerated absorbent having a viscosity less than 15 centistokes that is selected from one the of the following groups;
i. at least one polyamine in the absence of an effective amount of tertiary amine functionalities having a pKa sufficient to neutralize carbamic acid, the polyamine having at least one primary amine functionality having a pKa of <
10.0 at 25°
C. wherein and the feed gas stream has an SO2 concentration less than 5 ppm vol.; and
,ii. a polyamine in the absence of an effective amount of tertiary amine functionalities having a pKa sufficient to neutralize carbamic acid, the polyamine having at least one secondary amine functionality having a pKa for each sorbing nitrogen of <
10.0 at 25°
C.
to obtain a spent absorbent and a CO2 lean gas stream;
b. conveying the CO2 rich amine absorbent to a regeneration zone; and
,c. regenerating the absorbent.
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Abstract
A process for removing acid gas from a gas stream utilizes a low viscosity absorbent comprising a solution of at least one selected amine.
53 Citations
19 Claims
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1. A process for recovering CO2 from a feed gas stream comprising:
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a. treating the feed gas stream with a regenerated absorbent having a viscosity less than 15 centistokes that is selected from one the of the following groups; i. at least one polyamine in the absence of an effective amount of tertiary amine functionalities having a pKa sufficient to neutralize carbamic acid, the polyamine having at least one primary amine functionality having a pKa of <
10.0 at 25°
C. wherein and the feed gas stream has an SO2 concentration less than 5 ppm vol.; and
,ii. a polyamine in the absence of an effective amount of tertiary amine functionalities having a pKa sufficient to neutralize carbamic acid, the polyamine having at least one secondary amine functionality having a pKa for each sorbing nitrogen of <
10.0 at 25°
C.
to obtain a spent absorbent and a CO2 lean gas stream;b. conveying the CO2 rich amine absorbent to a regeneration zone; and
,c. regenerating the absorbent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification