05685170 is referenced by 51 patents and cites 21 patents.

Increased recovery of propane, butane and other heavier components found in a natural gas stream is achieved by installing an absorber upstream from an expander and a separator. The separator is downstream from the expander and returns the liquid stream generated by the separator back to the absorber. Additionally, the recovery of propane, butane and other heavier components is enhanced by combining the upper gas stream from a distillation column with the upper gas stream from the absorber prior to injecting this combination into the separator. The upper gas stream removed from the separator is then subsequently processed for the recovery of a predominately methane and ethane gas stream while the bottom liquid stream from the absorber is subsequently distilled for the generation of a stream consisting predominately of propane, butane and other heavy hydrocarbon components. Alternate embodiments include an additional reflux separator in the system, or substitution of an additional absorber for the separator.

Title
Propane recovery process
Application Number
8/727894
Publication Number
5685170
Application Date
October 9, 1996
Publication Date
November 11, 1997
Inventor
James N Sorensen
Calgary
CA
Agent
Robert J Edwards
Daniel S Kalka
Assignee
McDermott Engineers & Constructors
CA
IPC
F25J 3/00
View Original Source