Gas separation: processes – With control responsive to sensed condition – Concentration sensed
Patent
1996-08-26
1997-05-06
Bushey, C. Scott
Gas separation: processes
With control responsive to sensed condition
Concentration sensed
95 15, 95 22, 95 50, B01D 6100
Patent
active
056266499
ABSTRACT:
An apparatus reduces the pressure in a volatile chemical tank ullage including a first conduit for connection to the volatile chemical tank ullage, a vapor extractor, a pressure sensor to detect the pressure in the volatile chemical tank ullage, a separation module having an inlet connected to the first conduit, a separation membrane, a permeate outlet separated from the inlet by the separation membrane, and a retentate outlet, a second conduit connected to the permeate outlet for connection to the volatile chemical tank, a vapor pump associated with the second conduit for creating a low pressure in the separation module near the permeate outlet as to induce selected vapors to pass through the separation membrane, a vent associated with the retentate outlet to vent retentate to atmosphere, a VOC detector to detect VOC concentrations in the vent, and a controller to receive inputs from the pressure sensor and the VOC detector and output control signals to the vapor extractor and the vapor pump to pull vapor from the ullage when the pressure exceeds a pressure threshold and return permeate to the tank and permit relatively VOC-free air to be released through the vent, thereby reducing the pressure in the ullage.
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Bushey C. Scott
Gilbarco Inc.
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