Method and plant for amine emission control
First Claim
1. A method for eliminating or substantially reducing emission of amines and alkaline degradation products thereof to the atmosphere from a plant for CO2 capture from a flue gas, the method comprising:
- introducing the flue gas into an absorber;
allowing the flue gas to flow countercurrent to an absorbent comprising an aqueous solution of one or more amine(s) in an absorption zone for capturing the CO2 to form a CO2 lean exhaust gas and a CO2 rich absorbent;
collecting the CO2 rich absorbent;
regenerating the CO2 rich absorbent in a regeneration column to give a CO2 rich gas and a regenerated absorbent;
withdrawing the CO2 rich gas for further treatment;
recycling the regenerated absorbent to the absorption zone;
washing the CO2 lean exhaust gas with an aqueous solution comprising an acid selected from the group consisting of sulphuric acid, phosphoric acid, nitric acid, acetic acid, formic acid, and citric acid, to remove or substantially reduce an amount of amine(s) and alkaline degradation products thereof in the CO2 lean exhaust gas; and
wherein a part of the aqueous solution comprising the acid is bled off to a tank for further treatment with an alkaline solution, ion exchange, dialysis or bacterial decomposition.
4 Assignments
0 Petitions
Accused Products
Abstract
A method for eliminating or substantially reducing emission of amines (amineslip) and alkaline degradation products to the atmosphere from a plant for CO2 capture from a flue gas, where the CO2 is captured by counter-current flow to an absorbent in an absorption zone, the absorbent comprising an aqueous solution of one or more amine(s), to give a CO2 lean flue gas that is released into the surroundings, and a CO2 rich absorbent that is regenerated in a regeneration column to give a CO2 rich gas that is treated further, and regenerated absorbent that is recycled to the absorption zone, wherein the CO2 lean flue gas is washed with an acidic aqueous solution to remove or substantially reduce the amount of amine(s) and alkaline degradation products thereof in the gas, is described.
17 Citations
18 Claims
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1. A method for eliminating or substantially reducing emission of amines and alkaline degradation products thereof to the atmosphere from a plant for CO2 capture from a flue gas, the method comprising:
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introducing the flue gas into an absorber; allowing the flue gas to flow countercurrent to an absorbent comprising an aqueous solution of one or more amine(s) in an absorption zone for capturing the CO2 to form a CO2 lean exhaust gas and a CO2 rich absorbent; collecting the CO2 rich absorbent; regenerating the CO2 rich absorbent in a regeneration column to give a CO2 rich gas and a regenerated absorbent; withdrawing the CO2 rich gas for further treatment; recycling the regenerated absorbent to the absorption zone; washing the CO2 lean exhaust gas with an aqueous solution comprising an acid selected from the group consisting of sulphuric acid, phosphoric acid, nitric acid, acetic acid, formic acid, and citric acid, to remove or substantially reduce an amount of amine(s) and alkaline degradation products thereof in the CO2 lean exhaust gas; and wherein a part of the aqueous solution comprising the acid is bled off to a tank for further treatment with an alkaline solution, ion exchange, dialysis or bacterial decomposition. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for eliminating or substantially reducing emission of amines and alkaline degradation products thereof to the atmosphere from a plant for CO2 capture from a flue gas, the method comprising:
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introducing the flue gas into an absorber; allowing the flue gas to flow countercurrent to an absorbent comprising an aqueous solution of one or more amine(s) in an absorption zone for capturing the CO2 to form a CO2 lean exhaust gas and a CO2 rich absorbent; collecting the CO2 rich absorbent; regenerating the CO2 rich absorbent in a regeneration column to give a CO2 rich gas and a regenerated absorbent; withdrawing the CO2 rich gas for further treatment; recycling the regenerated absorbent to the absorption zone; washing the CO2 lean exhaust gas with an aqueous solution comprising an acid selected from the group consisting of sulphuric acid, phosphoric acid, nitric acid, acetic acid, formic acid, and citric acid, to remove or substantially reduce an amount of amine(s) and alkaline degradation products thereof in the CO2 lean exhaust gas; wherein a part of an acid washing solution is bled off and introduced into an amine reclaimer where amine salts in solution is boiled in the presence of alkali to liberate amine cations as free amine vapor which is reused as amine absorbent for CO2 capture; and wherein steam and gaseous amine from the reclaimer is routed to a fractionating column for separation of gaseous ammonia from water and amine distillate. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method for eliminating or substantially reducing emission of amines and alkaline degradation products thereof to the atmosphere from a plant for CO2 capture from a flue gas, the method comprising:
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introducing the flue gas into an absorber; allowing the flue gas to flow countercurrent to an absorbent comprising an aqueous solution of one or more amine(s) in an absorption zone for capturing the CO2 to form a CO2 lean exhaust gas and a CO2 rich absorbent; collecting the CO2 rich absorbent; regenerating the CO2 rich absorbent in a regeneration column to give a CO2 rich gas and a regenerated absorbent; withdrawing the CO2 rich gas for further treatment; recycling the regenerated absorbent to the absorption zone; washing the CO2 lean exhaust gas with an aqueous solution comprising an acid selected from the group consisting of sulphuric acid, phosphoric acid, nitric acid, acetic acid, formic acid, and citric acid, to remove or substantially reduce an amount of amine(s) and alkaline degradation products thereof in the CO2 lean exhaust gas; wherein a part of an acid washing solution is bled off and introduced into an amine reclaimer where amine salts in solution is boiled in the presence of alkali to liberate amine cations as free amine vapor which is reused as amine absorbent for CO2 capture; and wherein bleed of washing solution is introduced into a pre-reactor, wherein the washing solution is reacted with an alkali and stripped by vacuum or introduction of a stripping gas selectively to remove ammonia from the washing solution before the washing solution is introduced into the amine reclaimer. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification