Dual column process to remove nitrogen from natural gas

Details Dual column process to remove nitrogen from natural gas Dual column process to remove nitrogen from natural gas

1996-02-08

1997-04-08

Kilner, Christopher

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62927, F25J 302, F25J 308

Patent

active

056177410

ABSTRACT:
Nitrogen is removed from a natural gas feed stream by a cryogenic distillation process in which said feed stream is fed to a primary column of a distillation column system having a primary column and a secondary column fed from and operating at substantially the same pressure as the primary column. At least a portion of a primary column methane-rich bottoms liquid is expanded and at least partially vaporized in heat exchange with a condensing primary column nitrogen-enriched vapor. The at least partially condensed primary column nitrogen-enriched vapor is returned to the primary column to provide higher temperature reflux to the distillation column system. A secondary column methane-rich bottoms liquid is at least partially vaporized in heat exchange with a condensing nitrogen-rich overhead vapor to produce a further methane-rich product. At least a portion of the at least partially condensed nitrogen-rich overhead vapor portion is returned to the primary or secondary column to provide lower temperature reflux to the distillation column system.

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