Liquid purification or separation – Processes – Including controlling process in response to a sensed condition
Patent
1991-12-10
1993-05-11
Drodge, Joseph W.
Liquid purification or separation
Processes
Including controlling process in response to a sensed condition
210 87, 210 93, 210 961, 210143, 210182, 210202, 210259, 210769, 210770, 210772, 210774, 210806, 364502, 422 62, 422110, 422135, 422138, 436 55, 525537, 528486, B01D 1712, C08F28300
Patent
active
052098559
ABSTRACT:
A batch type process for purification of a polymer resin, in which a predetermined volume of acid is rapidly emptied and stirred into a fixed volume of polymer slurry for chemically treating impurities in the slurry, is converted to a continuous operation by supplying a substantially constant stream of polymer slurry and a controlled stream of acid to a mixing vessel. pH control of the polymer slurry required for effective purification of the polymer resin is achieved by manipulating the flow rate of the acid stream responsive to a feedforward control signal which operates in conjunction with a feedback signal. The feedforward signal is based on an upstream measurement of slurry flow rate to the mixing vessel and the feedback signal is based on a downstream pH measurement of slurry flowing from the mixing vessel.
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Cummins Donald E.
Kile Glenn W.
Long George E.
Solaas Dale M.
Bogatie George E.
Drodge Joseph W.
Phillips Petroleum Company
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