Configurations and methods for high pressure acid gas removal
First Claim
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1. A method of acid gas removal from a feed gas, comprising:
- contacting the feed gas in an absorber with an ultra-lean physical solvent to form a rich solvent and a treated feed gas;
sequentially depressurizing the rich solvent to remove C1-C3 hydrocarbons from the rich solvent to form a depressurized solvent, and recycling the C1-C3 hydrocarbons to the absorber;
flashing and stripping the depressurized solvent to produce an ultra-lean solvent and a flashed gas that predominantly comprises CO2 and C4+ components;
wherein the step of stripping is performed with a portion of the treated feed gas to form stripped vapors, and wherein the stripped vapors are recycled to the absorber to thereby recover C1-C3 hydrocarbons from the portion of the treated feed gas; and
separating the flashed gas in a separator to produce a CO2 stream having less than 5% C4+ components and a C4+ product.
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Abstract
Physical solvent is regenerated using flashing and stripping processes to produce an ultra-lean solvent. In especially preferred aspects, flashed C1-C3 hydrocarbons are recycled to the absorber, while C4+ hydrocarbons are recovered from the CO2 that is removed from the solvent. It is further preferred that depressurization of the rich solvent provides most of the refrigeration duty.
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9 Claims
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1. A method of acid gas removal from a feed gas, comprising:
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contacting the feed gas in an absorber with an ultra-lean physical solvent to form a rich solvent and a treated feed gas; sequentially depressurizing the rich solvent to remove C1-C3 hydrocarbons from the rich solvent to form a depressurized solvent, and recycling the C1-C3 hydrocarbons to the absorber; flashing and stripping the depressurized solvent to produce an ultra-lean solvent and a flashed gas that predominantly comprises CO2 and C4+ components; wherein the step of stripping is performed with a portion of the treated feed gas to form stripped vapors, and wherein the stripped vapors are recycled to the absorber to thereby recover C1-C3 hydrocarbons from the portion of the treated feed gas; and separating the flashed gas in a separator to produce a CO2 stream having less than 5% C4+ components and a C4+ product. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification