Method for recovery of CO2 from gas streams
First Claim
1. A process for recovering CO2 from a feed gas stream comprising treating the feed gas stream with a regenerated absorbent comprising at least one tertiary amine absorbent having a pKa for the amino function of from about 6.5 to about 9 in the presence of an oxidation inhibitor to obtain a CO2 rich stream, maintaining a sufficient oxidation inhibitor concentration in the absorbent to essentially prevent the oxidation of the absorbent by molecular oxygen and subsequently treating the CO2 rich stream to obtain the regenerated absorbent and a CO2 rich product stream.
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Abstract
A process for recovering CO2 from a feed gas stream comprises treating the feed gas stream with a regenerated absorbent comprising at least one tertiary amine absorbent having a pKa for the amino function of from about 6.5 to about 9 in the presence of an oxidation inhibitor to obtain a CO2 rich stream and subsequently treating the CO2 rich stream to obtain the regenerated absorbent and a CO2 rich product stream. The feed gas stream may also include SO2 and/or NOx.
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Citations
44 Claims
- 1. A process for recovering CO2 from a feed gas stream comprising treating the feed gas stream with a regenerated absorbent comprising at least one tertiary amine absorbent having a pKa for the amino function of from about 6.5 to about 9 in the presence of an oxidation inhibitor to obtain a CO2 rich stream, maintaining a sufficient oxidation inhibitor concentration in the absorbent to essentially prevent the oxidation of the absorbent by molecular oxygen and subsequently treating the CO2 rich stream to obtain the regenerated absorbent and a CO2 rich product stream.
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29. A process for recovering SO2 and CO2 from a feed gas stream comprising:
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(a) treating the feed gas stream in an SO2 scrubbing loop with a first absorbent stream to obtain a SO2 rich stream and a SO2 lean stream and subsequently treating the SO2 rich stream to obtain a first regenerated absorbent stream which is used in the SO2 scrubbing loop;
(b) treating the SO2 lean stream in a CO2 scrubbing loop with a second absorbent stream to obtain a CO2 rich stream and subsequently treating the CO2 rich stream to obtain a second regenerated absorbent stream which is used in the CO2 scrubbing loop; and
,(c) treating at least a potion of one or both of the first and second regenerated absorbent streams to remove heat stable salts wherein the absorbent used in each of the scrubbing loops comprises at least one tertiary amine and at least one secondary amine as an activator. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37)
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38. A process for removal of CO2 and NOx from a gas stream containing SO2 at a mole ratio <
- 5 times the NOx content, comprising treating the feed gas stream to obtain a CO2 rich stream by exposing the feed gas stream to a regenerated absorbent comprising at least one tertiary amine absorbent having a pKa for the amino function of from about 6.5 to about 9, an oxidation inhibitor, a metal chelate and sulfite and or other reactants and reducing agents to react with the NOx to produce reaction products comprising molecular nitrogen, sulfonated ammonia chemicals, and sulfate and/or dithionate ions, treating the CO2 rich stream to remove heat stable salts including sulfate and/or dithionate ions and adjusting the pH of the regenerated absorbent from about 7 to about 9.5 and subsequently treating the CO2 rich stream to obtain the regenerated absorbent.
- View Dependent Claims (39, 40, 41)
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42. A process for recovering SO2 and CO2 from a feed gas stream comprising:
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(a) subjecting the feed gas stream to a SO2 removal step using a SO2 absorbent and recovering a SO2 lean stream and a SO2 rich absorbent stream;
(b) regenerating the SO2 absorbent at a first temperature to obtain a regenerated SO2 absorbent stream and a first vapour stream;
(c) subjecting the SO2 lean stream to a CO2 removal step using a CO2 absorbent and recovering a CO2 lean stream and a CO2 rich absorbent stream;
(d) regenerating the CO2 absorbent at a second temperature to obtain a regenerated CO2 absorbent stream and a second vapour stream wherein the first temperature is lower than the second temperature so that at least a portion of the second vapour stream is used to regenerate the SO2 absorbent. - View Dependent Claims (43, 44)
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Specification