Cryogenic gas processing

Refrigeration – Processes – Circulating external gas

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62 31, 62 34, 62 39, F25J 302

Patent

active

044445776

ABSTRACT:
Higher boiling constituents are separated from a normally gaseous feed mixture, predominating in lower boiling constituents and containing significant amounts of such higher boiling constituents, such as natural gas by fractionally distilling a feed mixture having a temperature substantially below atmospheric temperature at a pressure substantially above atmospheric pressure at which temperature and pressure the feed mixture comprises both vapor and liquid phases to produce a first vapor phase substantially enriched in lower boiling constituents and a first liquid phase substantially enriched in higher boiling constituents, expanding at least a part of the first vapor phase to reduce the pressure and temperature and produce an expanded fluid stream comprising a second vapor phase and a second liquid phase, separating the second vapor phase from the second liquid phase, recycling the second liquid phase to the fractional distillation step as a reflux, recovering the second vapor phase as a product and recovering the first liquid phase as a product. In another embodiment, at least a part of the feed mixture is expanded prior to fractional distillation. In other embodiments, the feed mixture is separated into a vapor phase and a liquid phase and at least a part of the vapor phase is expanded and/or the feed mixture is first cooled by indirect heat exchange with the second vapor phase prior to recovery of the latter as a product.

REFERENCES:
patent: 3702541 (1972-11-01), Randall et al.
patent: 4040806 (1977-08-01), Kennedy
patent: 4274850 (1981-06-01), Becker

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