Refrigeration – Cryogenic treatment of gas or gas mixture – Separation of gas mixture
Patent
1998-12-31
2000-08-29
Capossela, Ronald
Refrigeration
Cryogenic treatment of gas or gas mixture
Separation of gas mixture
F25J 300
Patent
active
061090611
ABSTRACT:
A process is shown for separating a relatively hot feed gas containing methane, ethane and heavier hydrocarbon constituents into a volatile residue gas and a primarily liquid bottoms. The feed gas is cooled to partially condense the feed gas to form a liquid portion which is expanded and fed to a fractionating column. The expanded liquid portion flows down the column in countercurrent fashion to vapors flowing up the column to separate the relatively less volatile fraction as column bottoms. A side reboiler heats and vaporizes a portion of the liquids flowing down the fractionating column to provide stripping vapors which flow up the column. A portion of the relatively hot, methane rich feed gas entering the process is routed to the column at a selected location in order to raise the relative volatility of liquids near the bottom of the column, resulting in ethane rejection.
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ABB Randall Corporation
Capossela Ronald
Gunter Jr. Charles D.
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