Separation of fluid mixtures in multiple distillation columns

Details Separation of fluid mixtures in multiple distillation columns Separation of fluid mixtures in multiple distillation columns

1996-05-02

1997-12-02

Kilner, Christopher

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62927, F25J 302

Patent

active

056923953

ABSTRACT:
A fluid mixture is separated by distillation in a two column system in which the feed is prefractionated in a first column having at least one separation stage above the feed and the prefractionator bottoms provides feed to a second column operating at a lower pressure. Cooling for condensing the overhead vapor of the first column is provided by indirect heat exchange with a flashed portion of the feed or with an intermediate fluid obtained from the second column. The two-column system is readily combined with a high pressure column in a three-column distillation system for separating air which is particularly useful for integration with a gasification combined cycle combustion turbine system. Optionally, three nitrogen products can be produced at three different pressures.

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Rathbone, T., Paper, "Intermediate Flash Devices for Improving Air Separation," presented at the Tenth Intersociety Cryogenic Symposium, Mar. 20-23, 1995, Houston, Texas.
Agrawal, R. et al., Presentation "Energy Integrated Distillation Systems", AIChE Annual Meeting, Nov. 12-17, 1995, Miami Beach, FL.

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