Rectified reflux deethanizer

Details Rectified reflux deethanizer Rectified reflux deethanizer

1997-08-28

1999-03-23

Capossela, Ronald

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62935, F25J 100

Patent

active

058845046

ABSTRACT:
The present invention is an improvement in the combined fractionation steps of deethanization and C2 splitting for ethylene and ethane separation. Theoretical stages are added to the rectification section of a deethanizer above a liquid or vapor sidedraw. Polymer grade ethylene product up comprising to 30 percent of the ethylene in the deethanizer feed is obtained in an overhead stream according to the present invention. Lesser recovery at the same ethylene purity or higher recovery at lower ethylene purity are obtained varying recovery or numbers of additional stages in the rectification. An overall reduction in total cold utilities for the overhead condensers for the deethanizer and downstream C2 splitter are obtained in practicing the present invention.

REFERENCES:
patent: 2327134 (1943-08-01), Schuftan
patent: 3956415 (1976-05-01), Cummings et al.
patent: 4430102 (1984-02-01), Tedder

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