Refrigeration – Processes – Circulating external gas
Patent
1993-02-23
1994-07-05
Bennet, Henry A.
Refrigeration
Processes
Circulating external gas
62 17, 62 20, 62 25, F25J 306
Patent
active
053256735
ABSTRACT:
A method for pretreating a natural gas stream using a single scrub column to remove freezable C.sub.5+ components and provide an LNG product which can be conveniently handled and shipped is disclosed. The method comprises feeding a natural gas stream to a feed point on a scrub column operated substantially as an absorption column wherein the heavy components are absorbed from the feed gas using a liquid reflux essentially free of such C.sub.5+ components. The feed can be vapor introduced at a low point on the column, or can be optionally split, cooled and/or expanded and introduced at one or more feed points on the column. The reflux stream can be overhead vapor condensate having a temperature of about - 40.degree. C., or methane-rich LNG or a combination of LNG and vapor condensate.
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Durr Charles A.
Petterson WIlliam C.
Bennet Henry A.
Kilner Christopher B.
The M. W. Kellogg Company
Ward John P.
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