March 2013

Catalyst 2013 Supplement

Optimize feed treatment for polypropylene process

To realize full activity from polymerization catalysts, feed streams need to be as clean as possible from all contaminants and catalyst poisons. A very low level of even a single catalyst poison can reduce catalyst activity drastically.

Ziegler-Natta catalysts are primarily used in polypropylene (PP) production. These catalysts are very sensitive to various poisons and their activity varies according to the nature and level of catalyst poisons. Among others, typical propylene polymerization catalyst poisons include acetonitrile, arsine, carbon dioxide, carbon monoxide (CO), carbonyl sulfide, cyclopentadiene, ethylene oxide, oxygen, palladium, phosphine, moisture, methanol and propylene oxide. Catalyst poisons usually are present as impurities within feedstreams like propylene, ethylene and hydrogen. Each of the poisons has a varying degree of influence on the catalyst activity. Though their general behavior is known, it

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