Acid gas fractionation
First Claim
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1. Process for the bulk removal of H2 S and CO2 from a sour gas stream, which comprises:
- a) feeding a dry, sour gas stream containing a mixture of H2 S and CO2 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.
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Abstract
A process to bulk separate H2 S and CO2 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.
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Citations
20 Claims
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1. Process for the bulk removal of H2 S and CO2 from a sour gas stream, which comprises:
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a) feeding a dry, sour gas stream containing a mixture of H2 S and CO2 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. Process for the bulk removal of H2 S and CO2 from a sour gas stream which comprises:
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a) feeding a dry, sour gas stream containing a mixture of H2 S and CO2 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. - View Dependent Claims (17, 18)
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19. Process for the removal of H2 S and CO2 from a sour gas stream which comprises:
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a) feeding a dry, sour gas stream containing a mixture of H2 S and CO2 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. - View Dependent Claims (20)
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Specification