Distillation pressure control

Details Distillation pressure control Distillation pressure control

1987-03-16

1988-09-06

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 21, 203 2, 203DIG18, F25J 300

Patent

active

047690569

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.

REFERENCES:
patent: 2844160 (1958-07-01), Polk
patent: 2890156 (1959-06-01), Vautrain
patent: 2988894 (1961-06-01), Van Pool et al.
patent: 3049886 (1962-08-01), Cabbage
patent: 3361646 (1968-01-01), McMullan et al.
patent: 3939045 (1976-02-01), Walker
patent: 4298363 (1981-11-01), Campbell et al.
patent: 4371426 (1983-02-01), Di Biano et al.

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