C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
402/614
C08F 10/06 (2006.01) B01J 8/24 (2006.01)
Patent
CA 1296136
PATENT APPLICATION BY GEORGE G. ARDELL REGINALD W. GECK J. MITCHELL JENKINS, III WILLIAM G. SHEARD FOR PROCESS FOR CONTROLLED POLYMERIZATION OF STEREOSPECIFIC ALPHA-OLEFINS HAVING PRESELECTED ISOTACTICITY ABSTRACT OF THE INVENTION A method and system for controlling and maintaining relatively constant the desired isotacticity of polypropylene produced by a reactor system employs a model which correlates isotacticity values to catalyst productivity values. The model is generated from empirical data of the reactor system. A particular catalyst productivity target value is then calculated from the model corresponding to a desired level of isotacticity selected for the product. The instantaneous catalyst productivity of the system is then determined and compared to the catalyst productivity target value. When the comparison between the instantaneous catalyst productivity value and the catalyst productivity target value indicates that the desired isotacticity for the polypropylene product will not be achieved, process operating variables are adjusted to move catalyst productivity, and hence isotacticity, to the target values. The invention may be applied in reaction systems wherein the catalyst exhibits a predictable, i.e., relatively fixed relationship between catalyst productivity and the isotacticity of the polymer product. In a preferred embodiment, a control computer monitors system conditions and performs the necessary calculations and computerized feedback control is employed to implement the
542203
Ardell George Graham
Geck Reginald Walter
Jenkins John Mitchell III
Sheard William George
Sim & Mcburney
Union Carbide Corporation
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