Fractional distillation process control

Details Fractional distillation process control Fractional distillation process control

1985-01-17

1985-12-10

Bascomb, Wilbur

Distillation: processes, separatory

With measuring, testing or inspecting

203 2, 203DIG19, 196132, 202160, 208DIG1, 364501, B01D 342

Patent

active

045578060

ABSTRACT:
In a fractional distillation process in which a sidedraw product stream is withdrawn from the fractional distillation column, the flow rate of the overhead product stream is controlled so as to increase the flow of the upper external reflux so as to drop as much as possible of the overhead product into the sidedraw product stream. However, valve position control is utilized to override the control of the flow of the overhead product stream, which is being controlled so as to substantially maximize the flow of the sidedraw product stream, if the valve controlling the flow of the upper external reflux approaches fully open such that control of the liquid level in the overhead accumulator associated with the fractional distillation process is not lost.

REFERENCES:
patent: 3018230 (1962-01-01), Morgan
patent: 3294648 (1966-12-01), Lupfer et al.
patent: 3600283 (1971-08-01), Bollen et al.
patent: 3967937 (1976-07-01), Hobbs
patent: 4111218 (1978-09-01), Hobbs
patent: 4230533 (1980-10-01), Giroux
patent: 4348259 (1982-09-01), Jensen
patent: 4377443 (1983-03-01), Tuck et al.

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