Union Carbide Chemicals & Plastics Technology Corporation

Univation Technologies, LLC

Daniel N Thomas

John Francis Szul

Bruce Jon Savatsky

Eric John Markel

Fathi David Hussein

John Roberts Parrish

R Eric Pequeno

Ping P Cai

Ian D Burdett

W Scott Hamilton

Glenn A Lambert

Jose F Cevallos-Candau

Embodiments of the present disclosure are directed towards methods for controlling a polymerization reaction including determining an instantaneous density model for a gas-phase polymerization, and utilizing the instantaneous density model to monitor the polymerization reaction to determine if a threshold instantaneous density is reached.

Controlling a polymerization reaction

A process for controlling a continuous gas phase exothermic process in a reactor comprising: (i) effecting a gas phase exothermic reaction under a set of operating conditions in the presence of a cooling agent, the cooling agent having a pre-selected concentration and feed rate of an induced cooling agent; (ii) determining a maximum production rate (I) without regard to limitations due to the cooling agent under the operating conditions; (iii) determining a maximum production rate (II) with regard to limitations due to the cooling agent under the operating conditions; (iv) calculating an optimal concentration of the induced cooling agent such that the difference between (I) and (II) is minimized; and (v) adjusting the feed rate of the induced cooling agent to achieve the concentration value calculated in (iv).

Gas phase polymerization and method of controlling same

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S. Charleston, WV, United States of America

Daniel N Thomas