Refrigeration – Processes – Circulating external gas
Patent
1992-05-11
1993-07-06
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
55 16, 55 68, 62 20, F25J 300
Patent
active
052243508
ABSTRACT:
A subquality nitrogen-rich natural gas stream containing more than 0.1 mol % helium is countercurrently extracted with a lean physical solvent to produce a rich solvent bottoms stream which is flashed twice to produce a methane-rich gas product and a nitrogen-helium product which is fed to at least one membrane unit. A reject nitrogen stream and a crude helium stream are discharged from this unit. The crude helium stream is either compressed to a pressure within the range of 200 to 3,000 psia for sale or is compressed to no more than 1,000 psia and fed to a PSA unit which produces a reject nitrogen stream and a highly purified (99.99+ mol %) helium stream which is compressed to a pressure within the range of 200 to 3,000 psia for sale.
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"Comparison of the Mehra Process for Nitrogen Rejection to a Cryogenic Process for Nitrogen Rejection from Subquality Natural Gas", Report GRI-90/-290, Gas Research Institute.
Advanced Extraction Technologies, Inc.
Capossela Ronald C.
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