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Vapor Recovery Around the World |
Membrane technology genesis |
ARID’s membrane system incorporates hydrocarbon-selective membranes developed by GKSS Forschungszentrum Geesthacht GmbH, a federally-funded research institute located near Hamburg, Germany (www.gkss.de). The following US patents related to the membrane technology are owned, assigned to or licensed by ARID: 4,994,094; 5,537,911; 5,220,799; 5,367,882; and 6,059,856. In addition, ARID has an agreement with GKSS for the joint development and technical support for providing continuous improvements in the technology and exploring gas separation applications for selectively permeable membranes. |
Illinois, USA |
| In the United States, a major marketer has successfully operated ARID’s membrane system for over 18 months at a retail refueling facility in Illinois. The system has been operating automatically and unattended since October 1998 at this Stage II-equipped station. The station pumps about two million gallons of gasoline per year.
The duty cycle (the time that the system is operating in response to positive pressure being developed in the storage system) and savings resulting from using the membrane system are consistent with ARID’s Evaporative Loss Model, which was presented in the August PE&T article cited above. This mathematical model accurately predicts gasoline evaporative losses as a function of RVP, storage tank temperature and ingested air volume. Based on an annual gasoline consumption in the US of approximately 129 billion gallons (Federal Highway Administration, Monthly Motor Fuel Reported by States, March 1999), a savings of 0.25 percent will yield emissions savings of 323 million gallons per year or 968,000 tons per year. |
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