Configurations and method for improved gas removal
First Claim
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1. A plant comprising:
- an absorber that is configured to operate at a pressure that is supercritical for natural gas having a carbon dioxide content of between 10 mol % and 60 mol %, wherein the supercritical pressure is at least 2000 psig;
a gas source that is configured to provide a dehydrated natural gas-containing feed gas to the absorber at the supercritical pressure;
wherein the absorber is configured to produce a physical solvent that contains at least part of the carbon dioxide; and
a separator fluidly coupled to the absorber and configured to form a lean solvent and a carbon dioxide stream containing at least 95 mol % carbon dioxide from the physical solvent.
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Abstract
A plant includes an absorber (103) that operates in a gas phase supercritical region and removes an acid gas from a feed stream (9) at high recovery of the feed stream (10) while producing a high purity acid gas stream (36). Particularly preferred plants include gas purification plants that receive a feed gas with at least 5 mol % carbon dioxide at a pressure of at least 3000 psi.
40 Citations
25 Claims
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1. A plant comprising:
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an absorber that is configured to operate at a pressure that is supercritical for natural gas having a carbon dioxide content of between 10 mol % and 60 mol %, wherein the supercritical pressure is at least 2000 psig; a gas source that is configured to provide a dehydrated natural gas-containing feed gas to the absorber at the supercritical pressure; wherein the absorber is configured to produce a physical solvent that contains at least part of the carbon dioxide; and a separator fluidly coupled to the absorber and configured to form a lean solvent and a carbon dioxide stream containing at least 95 mol % carbon dioxide from the physical solvent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A plant comprising:
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an absorber that receives a feed gas at a pressure of at least 1000 psi and comprising at least 5 mol % carbon dioxide wherein the absorber employs a physical solvent to produce a rich solvent and a product gas that is at least partially depleted from the carbon dioxide; a first turbine that depressurizes the rich solvent and a first separator that separates a first hydrocarbon portion from the depressurized rich solvent, thereby producing a first hydrocarbon recycle stream and a first rich solvent; a second turbine that further depressurizes the first rich solvent and a cooler that employs the further depressurized first solvent to cool the physical solvent to maintain a bottom temperature of the absorber in a desired temperature range; and wherein the further depressurized first solvent is separated in a second separator that separates a second hydrocarbon portion from the further depressurized first solvent, thereby producing a second hydrocarbon recycle stream and a second rich solvent, and wherein the first and second hydrocarbon recycle streams are fed into the absorber. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A method of operating a plant, comprising:
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providing an absorber that receives a feed gas at a pressure of at least 1000 psi wherein the feed gas comprises an acid gas; removing at least part of the acid gas from the feed gas using a physical solvent, thereby forming a product gas and a rich solvent; reducing pressure of the rich solvent to form a hydrocarbon recycle stream that is fed into the absorber, thereby producing a depressurized rich solvent; using the depressurized rich solvent to cool the physical solvent, thereby maintaining a bottom temperature of the absorber in a desired temperature range and forming a heated depressurized rich solvent; and separating the heated depressurized rich solvent into a stream containing at least a portion of the acid gas, thereby forming a lean solvent. - View Dependent Claims (23, 24, 25)
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Specification