Patent ID: 9593189
Date: 2017-03-14
CPC Classifications: B01J,C08F,G01L

Claim:
1. A polymerization process comprising: circulating, with a pump, a reaction mixture slurry in a polymerization loop reactor during a polymerization process, wherein the reaction mixture slurry comprises an olefin, a catalyst, and polymer particles; detecting a pressure change in the reaction mixture slurry downstream of the pump; generating, by a pressure controller, a takeoff valve actuation signal for a takeoff valve based on the pressure change, wherein a portion of the reaction mixture slurry is continually removed from the polymerization reactor in proportion to the takeoff valve position, and wherein the reaction mixture slurry is retained in the polymerization reactor when the takeoff valve is in a closed position, wherein the reactor pressure is based on the takeoff valve position; generating, by the pressure controller, a correction to the takeoff valve actuation signal; generating, by the pressure controller, a time delay for the correction; applying the correction to the takeoff valve actuation signal to generate a corrected takeoff valve actuation signal; providing the corrected takeoff valve actuation signal to the takeoff valve after the time delay; and adjusting a position of the takeoff valve in response to providing the corrected takeoff valve actuation signal.