1
John V O Brien, Arthur S Holmes, Richard B Hopewell: Process for the separation of landfill gas. Koch Process Systems, Richard P Crowley, July 21, 1987: US04681612 (90 worldwide citation)

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 ...


2
Richard B Hopewell: Process for prevention of water build-up in cryogenic distillation column. Koch Process Systems, Richard P Crowley, January 5, 1988: US04717408 (10 worldwide citation)

A process by which a vapor side product stream is taken from the bottom section of a cryogenic distillation column, such as a propane or ethane recovery column, which process optionally employs a nonpolar liquid additive for use in the separation of acid gases from a hydrocarbon feed stream. The wit ...


3
Richard B Hopewell: Single column distillative separation employing bottom additives. Process Systems International, Richard P Crowley, September 13, 1994: US05345772 (6 worldwide citation)

A method for the distillative separation of hydrocarbon feed stream such as a carbon dioxide-containing feed stream in a single distillation column into a vapor carbon dioxide product stream and a side column product stream such as a liquid propane stream employing a recycled C4+ bottom additive str ...


4
Richard B Hopewell: System and process for the recovery of propylene and ethylene from refinery offgases. Chart, Calfee Halter & Griswold, October 30, 2001: US06308532 (3 worldwide citation)

A system and process for the recovery of ethylene and propylene from a gas stream, such as a refinery offgas stream. The process comprises withdrawing, cooling, and recovering an overhead vapor stream from a single distillation column. The process includes withdrawing a liquid C


5
Richard B Hopewell: Process for the recovery of a light hydrocarbon fraction from marine loading operations. Process System International, Richard P Crowley, May 31, 1994: US05315832 (2 worldwide citation)

The process for the recovery of light hydrocarbon fractions from off-gases derived from the transfer of petroleum material, particularly from a marine loading operation. One process comprises introducing the off-gases containing a light hydrocarbon fraction to be recovered into a refrigerated absorb ...


6
Richard B Hopewell: High ethane recovery from a ryan/holmes additive recovery column. Calfee Halter & Griswold, March 13, 2003: US20030047492-A1

A method for separating a high ethane-content product from a high methane-content feed stream including the steps of introducing a high methane-content feed stream into a first distillation column containing a plurality of vapor-liquid contact devices and generating a first bottoms stream, and intro ...



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