Distillation pressure control
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United States of America Patent
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-
Sep 6, 1988
Grant Date -
N/A
app pub date -
Mar 16, 1987
filing date -
Mar 16, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a fractional distillation column wherein a split-range controller alternately manipulates a valve for flaring gas to decrease pressure and a valve for importing gas to increase pressure as required to maintain a desired distillation pressure, both flare gas and import gas are minimized by providing a valve position controller that slowly drives both of the control valves manipulated by the split-range controller toward a closed position while maintaining the desired distillation pressure.
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