04681612 is referenced by 90 patents and cites 8 patents.

A recycle process for the separation of landfill gas containing a wide variety of impurities into a carbon dioxide product stream and a fuel-grade-pressurized methane product stream, the process providing for the removal of both the impurities and the carbon dioxide in a cryogenic column as a bottom stream, the separation of the methane from the overhead product stream by a membrane process, and, optionally, the removal of impurities from the carbon dioxide bottom stream in a separate purification column, to recover a high-quality, liquid, carbon dioxide stream.

Title
Process for the separation of landfill gas
Application Number
615577
Publication Number
4681612
Application Date
January 24, 1986
Publication Date
July 21, 1987
Inventor
Richard B Hopewell
Medfield
MA, US
Arthur S Holmes
LaCrosse
WI, US
John V O Brien
Shrewsbury
MA, US
Agent
Richard P Crowley
Assignee
Koch Process Systems
MA, US
IPC
F25J 3/06
View Original Source