Method of Separating Carbon Dioxide from Liquid Acid Gas Streams
AssigneeExxon Mobil Upstream Research Company
InventorsRussell H. Oelfke, Tor Vestad
Life of this patent
Estimating the term…
Abstract
Embodiments described herein provide methods and systems for generating a CO2 product stream. A method described includes generating a liquid acid gas stream including H2S and CO2. The liquid acid gas stream is flashed to form a first vapor stream and a bottom stream. The bottom stream is fractionated to form a second vapor stream and a liquid acid waste stream. The first vapor stream and the second vapor stream are combined to form a combined vapor stream. The combined vapor stream is treated in an absorption column to remove excess H2S, forming the CO2 product stream.
Claims20
A method for generating a CO2 product stream, comprising:
- generating a liquid acid gas stream comprising H2S and CO2;
- flashing the liquid acid gas stream to form a first vapor stream and a bottom stream;
- fractionating the bottom stream to form a second vapor stream and a liquid acid waste stream;
- combining the first vapor stream and the second vapor stream to form a combined vapor stream;
- and
- treating the combined vapor stream with a physical solvent to remove excess H2S, forming the CO2 product stream.
A system for generating a CO2 enriched stream, comprising:
- an acid gas flash drum configured to flash a portion of a liquid acid gas stream into a vapor stream and a liquid stream;
- a bulk liquid stripper configured to contact the liquid stream with an acid gas stream and flash at least a portion of the liquid stream into an overhead stream and a bottoms stream, wherein the overhead stream and the vapor stream are mixed to form a combined gas stream, and wherein the bottoms stream is disposed of as a concentrated acid gas stream;
- and
- an absorption column configured to contact the combined gas stream with a preloaded absorbent stream, wherein a rich absorbent stream exits the bottom of the absorption column and a CO2 enriched vapor stream exits the top of the column.
A method for purifying a natural gas stream comprising:
- dehydrating the natural gas stream;
- cryogenically separating the natural gas stream into a methane rich fraction, a natural gas liquids fraction, and a liquid acid gas stream;
- fractionating the liquid acid gas stream to form a CO2 enriched stream and a liquid acid waste stream;
- and
- treating the CO2 enriched stream with an absorbent to remove excess H2S forming a CO2 product stream.
Dependencies are inferred from the claim text.