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Cyclic membrane separation process

United States Patent

May 3, 2005
View the Complete Patent at the US Patent & Trademark Office
A cyclic process for controlling environmental emissions of volatile organic compounds (VOC) from vapor recovery in storage and dispensing operations of liquids maintains a vacuum in the storage tank ullage. In the first part of a two-part cyclic process ullage vapor is discharged through a vapor recovery system in which VOC are stripped from vented gas with a selectively gas permeable membrane. In the second part, the membrane is inoperative while gas pressure rises in the ullage. In one aspect of this invention, a vacuum is drawn in the membrane separation unit thus reducing overall VOC emissions.
Nemser; Stuart M. (Wilmington, DE)
CMS Technology Holdings, Inc. (Wilmington, DE)
10/ 760,169
January 16, 2004
Support was provided under Department of Energy award DE-FG02-00ER82976. The U.S. government has rights in this patent application.