Process for controlled polymerization of stereospecific alpha-ol

Details Process for controlled polymerization of stereospecific alpha-ol Process for controlled polymerization of stereospecific alpha-ol

1986-07-24

1990-09-11

Smith, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Effecting a change in a polymerization process in response...

526 59, 526901, C08F 234, C08F 1006

Patent

active

049564269

ABSTRACT:
A method and system for regulating the isotacticity of polypropylene in a continuous process for manufacturing polypropylene by the polymerization of alpha-olefins in a fluidized bed reactor system using a model which correlates isotacticity values to catalyst productivity values. A catalyst productivity target value is computed using the model based upon a selected xylene solubles or isotactic index. The instantaneous catalyst productivity of the system is then determined by dividing product production rate by catalyst flow rate which is then compared to the catalyst productivity target value. When the comparison between the instantaneous catalyst productivity value and the catalyst productivity differ the molar feed ratio of SCA to alkyl is automatically adjusted until the catalyst productivity, and hence isotacticity, is changed approaching the target values.

REFERENCES:
patent: 3594559 (1971-07-01), Pemberton
patent: 4563512 (1986-01-01), Goodall

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