Refrigeration – Processes – Circulating external gas
Patent
1986-02-13
1987-07-14
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
55 29, 55 68, 62 20, F25J 300
Patent
active
046800425
ABSTRACT:
A natural gas stream containing more than 3 mol percent of inert gases is extractively stripped with a preferential physical solvent to separate the inert gas from the C.sub.1 + hydrocarbons and to separate selected amounts of C.sub.2 +, C.sub.3 +, C.sub.4 +, or C.sub.5 + hydrocarbon product from a C.sub.1 gas product which may additionally contain one or more of unselected C.sub.2 -C.sub.4 hydrocarbons. The extraction and stripping are performed within at least one Extractive Stripping (ES) column which has a reboiler at its bottom, receives a stream of lean solvent at its top, and receives feed near its middle. When two ES columns are utilized, inert gas and methane may be recovered within the first ES column as overhead, and rich solvent may be withdrawn as its bottoms. The overhead may be separated in the second ES column into inert gas and methane. The rich solvent is regenerated by distilling in a product recovery column. It is also feasible to employ separate solvent systems, in which different solvents are used, in each ES column. The first ES column may alternatively be utilized for initially isolating the inert gas from the rich solvent containing all of the hydrocarbons. The rich solvent is fed to the second ES column for separating C.sub.1 from a second rich solvent containing C.sub.2 + hydrocarbons. This C.sub.2 + rich solvent is fed to a hydrocarbon product column for separating lean solvent from the C.sub.2 + hydrocarbons.
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Advanced Extraction Technologies, Inc.
Capossela Ronald C.
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