Gas separation: processes – Liquid contacting – And recycle or reuse of contact liquid for further contact
Patent
1994-03-04
1995-10-31
Chiesa, Richard L.
Gas separation: processes
Liquid contacting
And recycle or reuse of contact liquid for further contact
62 20, 95 96, 95143, 95208, 95230, 95237, 585809, B01D 4714
Patent
active
054625831
ABSTRACT:
An absorption process for separating a feed gas stream having components with a spectrum of volatilities including volatile (light) components, intermediate volatility components, and least volatile (heavy) components. The disclosed process includes the steps of: (1) contacting the feed gas stream with a liquid lean solvent stream in an absorber to produce a light product gas stream that is composed of predominantly light components and a rich solvent stream containing most of the intermediate and heavy components; (2) flashing the rich solvent stream at reduced pressure in a flash zone to produce an intermediate product gas stream composed predominantly of intermediate components and a lean solvent stream; (3) conveying the lean solvent stream from the flashing zone to the absorber, wherein the lean solvent is composed predominantly of heavy components taken from the feed; the process does not use an external lean solvent. The process is particularly useful for rejecting nitrogen from natural gas and for recovering hydrogen from refinery and petrochemical process off-gases.
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Mehra Yuv R.
Wood Glenn C.
Advanced Extraction Technologies, Inc.
Chiesa Richard L.
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