METHODS FOR DEACIDIZING GASEOUS MIXTURES BY PHASE ENHANCED ABSORPTION
First Claim
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1. A method for deacidizing a gaseous mixture comprising an acid gas, the process comprising:
- contacting the gaseous mixture with an absorbent in an absorption unit, wherein the absorbent comprises a carrier phase and a transportation phase that is immiscible with or mechanically separable from the carrier phase;
allowing the transportation phase to absorb the acid gas and convert the acid gas into an absorbed acid gas, so as to convert the absorbent into a gas-rich absorbent and to convert the gaseous mixture into a purified gaseous mixture;
allowing the absorbed acid gas to be transferred into the carrier phase, so as to form a first gas-lean phase and a gas-rich phase in the gas-rich absorbent;
providing the gas-rich absorbent to a separation unit, so as to separate the first gas-lean phase from the gas-rich phase;
cycling the separated first gas-lean phase back into the absorption unit;
providing the separated gas-rich phase to a regeneration unit, so as to obtain the acid gas and a second gas-lean phase; and
cycling the second gas-lean phase back into the absorption unit.
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Abstract
An improved process for deacidizing a gaseous mixture using phase enhanced gas-liquid absorption is described. The process utilizes a multiphasic absorbent that absorbs an acid gas at increased rate and leads to reduced overall energy costs for the deacidizing operation.
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Citations
19 Claims
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1. A method for deacidizing a gaseous mixture comprising an acid gas, the process comprising:
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contacting the gaseous mixture with an absorbent in an absorption unit, wherein the absorbent comprises a carrier phase and a transportation phase that is immiscible with or mechanically separable from the carrier phase; allowing the transportation phase to absorb the acid gas and convert the acid gas into an absorbed acid gas, so as to convert the absorbent into a gas-rich absorbent and to convert the gaseous mixture into a purified gaseous mixture; allowing the absorbed acid gas to be transferred into the carrier phase, so as to form a first gas-lean phase and a gas-rich phase in the gas-rich absorbent; providing the gas-rich absorbent to a separation unit, so as to separate the first gas-lean phase from the gas-rich phase; cycling the separated first gas-lean phase back into the absorption unit; providing the separated gas-rich phase to a regeneration unit, so as to obtain the acid gas and a second gas-lean phase; and cycling the second gas-lean phase back into the absorption unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for deacidizing a gaseous mixture comprising an acid gas, the process comprising:
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contacting the gaseous mixture with an absorbent in an absorption unit, wherein the absorbent comprises a carrier phase and a transportation phase that is immiscible with or mechanically separable from the carrier phase; allowing the transportation phase to absorb the acid gas and convert the acid gas into an absorbed acid gas, so as to convert the absorbent into a gas-rich absorbent and to convert the gaseous mixture into a purified gaseous mixture; allowing the absorbed acid gas to be transferred into the carrier phase, so as to form a first gas-lean phase and a gas-rich phase in the gas-rich absorbent; providing the gas-rich absorbent to a separation unit, so as to separate the first gas-lean phase from the gas-rich phase; cycling the separated first gas-lean phase back into the absorption unit; providing the separated gas-rich phase to a regeneration unit, so as to obtain the acid gas and a second gas-lean phase; and cycling the second gas-lean phase back into the absorption unit, wherein the absorbent comprises a pair of the transportation phase and the carrier phase selected from the group consisting of; (1) a solution of at least one of monoethanolamine, diethanolamine, methyl diethanolamine, piperizine, dibutylamine, diisopropylamine in at least one of an alcohol, a glycol ether and a glycol, and one or more reaction products of monoethanolamine, diethanolamine, methyl diethanolamine, piperizine, dibutylamine, diisopropylamine with CO2; (2) a solution of at least one of monoethanolamine, diethanolamine, methyl diethanolamine, piperizine, dibutylamine, diisopropylamine in at least one of an alcohol, a glycol ether and a glycol, and an aqueous solution of one or more reaction products of monoethanolamine, diethanolamine, methyl diethanolamine, piperizine, dibutylamine, diisopropylamine with CO2; (3) a solution of at least one of monoethanolamine, diethanolamine, methyl diethanolamine, piperizine, dibutylamine, diisopropylamine in at least one of an alcohol, a glycol ether and a glycol, and one or more reaction products of monoethanolamine, diethanolamine, methyl diethanolamine, piperizine, dibutylamine, diisopropylamine with CO2; (4) a solution of at least one of monoethanolamine, diethanolamine, methyl diethanolamine, piperizine, dibutylamine, diisopropylamine in at least one of an alcohol, a glycol ether and a glycol, and an aqueous solution of potassium carbonate; and (5) a solution of at least one of amine, amino-acid salt, potassium carbonate, or sodium carbonate in water, and potassium bicarbonate, potassium carbonate, sodium bicarbonate, or sodium carbonate.
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16. A method for deacidizing a gaseous mixture comprising an acid gas, the process comprising:
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contacting the gaseous mixture with an absorbent in an absorption unit, wherein the absorbent comprises a carrier phase and a transportation phase that is immiscible with or mechanically separable from the carrier phase; allowing the transportation phase to absorb the acid gas and convert the acid gas into an absorbed acid gas, so as to convert the absorbent into a gas-rich absorbent and to convert the gaseous mixture into a purified gaseous mixture; allowing the absorbed acid gas to be transferred into the carrier phase, so as to form a first gas-lean phase and a gas-rich phase in the gas-rich absorbent; providing the gas-rich absorbent to a separation unit, so as to separate the first gas-lean phase from the gas-rich phase; cycling the separated first gas-lean phase back into the absorption unit; providing the separated gas-rich phase to a regeneration unit, so as to obtain the acid gas and a second gas-lean phase; and cycling the second gas-lean phase back into the absorption unit, wherein the absorption of the acid gas from the gaseous mixture and the transportation of the absorbed acid gas to the carrier phase occur in one unit or multiple units, the carrier phase exists before, during or after the absorption of the acid gas, and the transportation phase exists before, during or after the absorption of the acid gas. - View Dependent Claims (17, 18, 19)
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Specification