Distillation: processes – separatory – With measuring – testing or inspecting – Of temperature or pressure
Patent
1981-08-17
1983-02-01
Bascomb, Jr., Wilbur L.
Distillation: processes, separatory
With measuring, testing or inspecting
Of temperature or pressure
203 3, 62 21, 62 37, 202160, 202206, 364501, 585809, B01D 342
Patent
active
043714269
ABSTRACT:
In a fractional distillation column in which at least a first component and a second component are at least partially separated with the first component being removed principally as an overhead product and the second component being removed principally as a bottoms product and in which the heat supplied to the fractional distillation column is used as the primary control for the overhead product composition with the flow rate of external reflux to the fractional distillation column being used to control the bottoms product composition, a comparison of the actual concentration of the second component in the overhead product to the desired concentration is utilized to bias the control signal which is utilized to manipulate the flow rate of the external reflux to the fractional distillation column. The bias term provides a quick response to an off-specification overhead product by changing the flow rate of the external reflux so as to maintain a desired overhead product composition until the heat supplied to the fractional distillation column can be changed to maintain the desired overhead product composition.
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patent: 3840437 (1974-10-01), Awan et al.
patent: 4252614 (1981-02-01), Stewart
DiBiano Robert J.
Hobbs James W.
Bascomb, Jr. Wilbur L.
Phillips Petroleum Company
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