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US 5,983,663 AGranted
Acid gas fractionation
AssigneeKvaerner Process Systems A.S.
InventorAnthony J Sterner
Life of this patent
Estimating the term…
Abstract
A process to bulk separate H.sub.2 S and CO.sub.2 from a sour gas by first cooling the inlet sour gas, passing the cooled sour gas through a separator and removing a liquid acid gas as a bottoms product in a fractionation tower, and then either pumping or free flowing the liquid acid gas into a disposal well. Potential sulphur deposition problems are controlled by recycling liquid acid gas to the plant inlet.
Claims20
Process for the bulk removal of H.sub.2 S and CO.sub.2 from a sour gas stream, which comprises:
- a) feeding a dry, sour gas stream containing a mixture of H.sub.2 S and CO.sub.2 Into a gas/gas exchanger and a chiller to cool the dry, sour gas;
- b) feeding the cooled, dry, sour gas into a separator to obtain a gaseous top product and a condensed liquid acid gas bottoms product;
- c) feeding the condensed liquid acid gas bottoms product to a fractionation tower, to strip further vapors from the condensed liquid acid gas bottoms product and obtain a pressurized, condensed liquid acid gas bottoms product and over head vapors;
- and
- d) combining and mixing the gaseous top product from the separator and the overhead vapors from the fractionation column and feeding them into the gas/gas exchanger to exchange heat with the dry, sour gas stream.
2 more elements
Process for the bulk removal of H.sub.2 S and CO.sub.2 from a sour gas stream which comprises:
- a) feeding a dry, sour gas stream containing a mixture of H.sub.2 S and CO.sub.2 into an inlet to a gas/gas exchanger and a chiller, to cool the dry, sour gas;
- b) feeding the cooled, dry, sour gas into a separator to obtain a gaseous top product, and a condensed liquid acid gas bottoms product;
- c) feeding the condensed liquid acid gas bottoms product to a fractionation tower, to strip further vapors from the condensed liquid acid gas bottoms product and obtain a further condensed liquid acid gas bottoms product and overhead vapors;
- d) cooling said gaseous top product from said separator to a cryogenic level and feeding said cooled gaseous top product to a further separator where further condensed liquid acid gas is obtained as a bottoms products and further overhead vapors are obtained;
- the further condensed liquid acid gas bottoms product from said further separator being fed to said fractionation tower;
- e) combining and mixing the further overhead vapors from the further separator and the overhead vapors from the fractionation column and feeding them into the gas/gas exchanger to exchange heat with the dry, sour gas stream;
- and
- f) dropping the pressure of said gaseous product from said separator across a Joule-Thompson valve.
5 more elements
Process for the removal of H.sub.2 S and CO.sub.2 from a sour gas stream which comprises:
- a) feeding a dry, sour gas stream containing a mixture of H.sub.2 S and CO.sub.2 into an inlet to a gas/gas exchanger and a chiller to cool the dry, sour gas;
- b) feeding the cooled, dry, sour gas into a first separator to obtain a first gaseous top product, and a first condensed liquid acid gas bottoms product;
- c) feeding the condensed liquid acid gas bottoms product to a fractionation tower, to strip further vapors from the first condensed liquid acid gas bottoms product and obtain a second pressurized condensed liquid acid gas bottoms product and overhead vapors;
- d) cooling said first gaseous top product from said first separator to a cryogenic level in a cold gas exchanger and feeding said cooled first gaseous top product to a second separator where a second condensed liquid acid gas is obtained as a bottoms products, and a second gaseous top product;
- the second condensed liquid acid gas bottoms product from said second separator being fed to said fractionation tower;
- e) combining and mixing the second gaseous product from the second separator and the overhead vapors from the fractionation column and feeding them into the gas/gas exchanger to exchange heat with the dry, sour gas stream;
- and
- f) dropping the pressure of said first gaseous top product from said first separator across a turbo-expander.
5 more elements
Dependencies are inferred from the claim text.