Twin reflux process and configurations for improved natural...

Details Twin reflux process and configurations for improved natural... Twin reflux process and configurations for improved natural...

2006-05-30

2006-05-30

Doerrler, William C. (Department: 3744)

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

C062S625000, C062S630000

Reexamination Certificate

active

07051553

ABSTRACT:
A two-column NGL recovery plant includes an absorber (110) and a distillation column (140) in which the absorber (110) receives two cooled reflux streams, wherein one reflux stream (107) comprises a vapor portion of the NGL and wherein the other reflux stream (146) comprises a lean reflux provided by the overhead (144) of the distillation column (140). Contemplat configurations are especially advantageous in a upgrade of an existing NGL plant and typically exhibit C3recovery of at least 99% and C2 recovery of at least 90%.

REFERENCES:
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patent: 4509967 (1985-04-01), Sweet
patent: 4657571 (1987-04-01), Gazzi
patent: 5220797 (1993-06-01), Krishnamurthy et al.
patent: 5685170 (1997-11-01), Sorensen
patent: 6368385 (2002-04-01), Paradowski

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