Carbon dioxide and hydrogen sulfide recovery system using a combination of membranes and low temperature cryogenic separation processes
AssigneeCameron International Corporation
InventorAnkur D. Jariwala
Life of this patent
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Abstract
An acid gas purification system is described herein that includes a primary membrane system with a CO2- and H2S-enriched permeate stream effluent and a hydrocarbon stream effluent; a first compression stage arranged to receive the CO2- and H2S-enriched permeate stream and produce a compressed stream; and a cryogenic separation system to receive the compressed stream, the cryogenic separation system including a cooler followed by a fractionator, wherein the fractionator produces a CO2- and H2S liquid stream and a hydrocarbon gas stream.
Claims14
An acid gas purification system, comprising:
- a primary membrane system with a CO2- and H2S-enriched permeate stream effluent and a hydrocarbon stream effluent;
- a first compressor arranged to receive the CO2- and H2S-enriched permeate stream and produce a compressed stream;
- and
- a cryogenic separation system to receive the compressed stream,
- the cryogenic separation system including a conditioner followed by a frozen CO2 fractionator, wherein the frozen CO2 fractionator comprises a stripping section, a rectification section, and a mid-section, wherein the mid-section comprises a side processor comprising an empty section configured to return a solid to the frozen CO2 fractionator, and wherein the side processor further comprises a condenser that produces a liquid level in the side processor, and
- wherein the frozen CO2 fractionator produces a CO2 and H2S liquid stream and a hydrocarbon gas stream, and the hydrocarbon gas stream is compressed in a second compressor and blended with the hydrocarbon stream effluent of the primary membrane system.
An acid gas purification system, comprising:
- a membrane separation unit that produces a permeate stream enriched in CO2 and/or H2S and a retentate stream from a feed stream;
- a conditioner to reduce a temperature of the permeate stream;
- and
- a cryogenic fractionator to separate acid gases from the cooled permeate stream, the cryogenic fractionator having an overhead that is compressed and blended with the retentate stream,
- wherein the cryogenic fractionator is a frozen CO2 fractionator comprising a stripping section, a rectification section, and a mid-section, wherein the mid-section comprises a side processor comprising an empty section configured to return a solid to the frozen CO2 fractionator, and wherein the side processor further comprises a condenser that produces a liquid level in the side processor.
An acid gas purification system, comprising:
- a non-distillation separation system with an acid gas effluent and a separation gas effluent, wherein the non-distillation separation system is a single step separation and the acid gas effluent is at least 90 mol % CO2 and/or H2S;
- and
- a cryogenic fractionation system including a conditioner and a fractionator, wherein the cryogenic fractionation system produces an overhead stream that is compressed and blended with the separation gas effluent of the non-distillation separation system,
- wherein the fractionator is a frozen CO2 fractionator comprising a stripping section, a rectification section, and a mid-section, wherein the mid-section comprises a side processor comprising an empty section configured to return a solid to the frozen CO2 fractionator, and wherein the side processor further comprises a condenser that produces a liquid level in the side processor.
Dependencies are inferred from the claim text.