Configurations and methods of acid gas removal
First Claim
Patent Images
1. A plant comprising:
- a solvent source that is configured to provide a carbon dioxide-depleted lean hydrogen sulfide-containing physical solvent;
a vacuum stripper coupled to the solvent source and configured to produce an ultra-lean physical solvent from the carbon dioxide-depleted hydrogen sulfide-containing lean physical solvent; and
at least one of a high-pressure flash vessel and a medium pressure flash vessel coupled via respective conduits to the vacuum stripper, wherein the conduits and the at least one of the high-pressure flash vessel and the medium pressure flash vessel are configured to provide a substantially hydrogen sulfide-free stripping gas from the at least one of the high-pressure flash vessel and the medium pressure flash vessel to the vacuum stripper.
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Accused Products
Abstract
A plant includes a vacuum stripper (118) that receives a lean hydrogen sulfide-containing physical solvent (32) and in which substantially hydrogen sulfide-free stripping gas (51,52) is provided by at least one of a high-pressure flash vessel (110) and a medium pressure flash vessel (112). Contemplated configurations advantageously extend the range of use for physical solvents to treat sour gas comprising carbon dioxide and hydrogen sulfide, and can be used to meet most pipeline specification of 4 ppm hydrogen sulfide.
60 Citations
17 Claims
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1. A plant comprising:
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a solvent source that is configured to provide a carbon dioxide-depleted lean hydrogen sulfide-containing physical solvent; a vacuum stripper coupled to the solvent source and configured to produce an ultra-lean physical solvent from the carbon dioxide-depleted hydrogen sulfide-containing lean physical solvent; and at least one of a high-pressure flash vessel and a medium pressure flash vessel coupled via respective conduits to the vacuum stripper, wherein the conduits and the at least one of the high-pressure flash vessel and the medium pressure flash vessel are configured to provide a substantially hydrogen sulfide-free stripping gas from the at least one of the high-pressure flash vessel and the medium pressure flash vessel to the vacuum stripper. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of producing an ultra-lean physical solvent, comprising:
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separating in at least one of a high-pressure flash vessel and a medium pressure flash vessel a substantially hydrogen sulfide-free stripping gas from a physical solvent; further reducing pressure in the physical solvent to remove carbon dioxide and to so form a carbon dioxide-depleted lean hydrogen sulfide-containing physical solvent; and feeding the substantially hydrogen sulfide-free stripping gas into a vacuum stripper to thereby strip hydrogen sulfide from the carbon dioxide-depleted lean hydrogen sulfide-containing physical solvent in the vacuum stripper to so form the ultra-lean physical solvent; and feeding the ultra-lean physical solvent to an absorber, and operating the absorber with an isothermal gradient or with a decreasing top-to-bottom thermal gradient. - View Dependent Claims (13, 14, 15)
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16. A method of producing an ultra-lean physical solvent, comprising:
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producing in an absorber an acid gas enriched physical solvent; separating in at least one of a high-pressure flash vessel and a medium pressure flash vessel a substantially hydrogen sulfide-free flashed hydrocarbon vapor from the acid gas enriched physical solvent to so produce a flashed solvent; recycling one portion of the substantially hydrogen sulfide-free flashed hydrocarbon vapor to the absorber, and using another portion of the substantially hydrogen sulfide-free flashed hydrocarbon vapor as a stripping gas; further reducing pressure of the flashed solvent and separating the pressure-reduced flashed solvent into a carbon dioxide stream and a carbon dioxide-depleted lean hydrogen sulfide-containing physical solvent; and stripping hydrogen sulfide from the carbon dioxide-depleted lean hydrogen sulfide-containing physical solvent in a vacuum stripper using the stripping gas to so form the ultra-lean physical solvent. - View Dependent Claims (17)
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Specification