Process for the production of polypropylene

Details Process for the production of polypropylene Process for the production of polypropylene

1993-07-19

1999-12-21

Tsang, Cecilia J.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

5261241, 5261242, 526351, C08F11006

Patent

active

060050497

ABSTRACT:
A process for the production of polypropylene comprising continuously contacting liquid propylene or a mixture comprising liquid propylene and one or more other alpha-olefins in one or more reaction zones, under gas phase polymerization conditions, with a catalyst system comprising (i) a solid particulate catalyst precursor, which includes magnesium; titanium; a halogen which is chlorine, bromine, or iodine, or mixtures thereof; and, as an inside electron donor, a carboxylic acid ester; (ii) a hydrocarbylaluminum cocatalyst; and (iii) as an outside electron donor, a silicon compound containing at least one silicon-oxygen-carbon linkage, the particles of precursor being carried into the reaction zone(s) via a portion of the liquid propylene, the flow rate of said portion having a Reynolds number greater than about 15,000.

REFERENCES:
patent: 5093415 (1992-03-01), Brady, III et al.
patent: 5096868 (1992-03-01), Hsien et al.
Dean, "Langes Handbook of Chemistry" (Cite to Definition of Reynold's Number) pp. 10-96 (1985) McGraw Hill.

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