Cyclic membrane separation process
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United States of America Patent
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Apr 13, 2004
Grant Date -
N/A
app pub date -
Jan 24, 2003
filing date -
Jan 24, 2003
priority date (Note) -
Expired
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Abstract
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 one 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 other part, the membrane is inoperative while gas pressure rises in the ullage. Ambient air is charged to the membrane separation unit during the latter part of the cycle.
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