POLYPROPYLENE PRODUCTION PROCESSES

摘要

Processes for producing a polypropylene product by using a lower purity propylene stream. An operating parameter of the separation zone for a dehydrogenation zone effluent may be adjusted or controlled to lower the purity of the propylene stream produced by the separation zone. The reflux rate of propylene-propane splitter may be reduced. The duty of the reboiler for the propylene-propane splitter may be lowered. The number of stages in the propylene-propane splitter may be decreased.

主权项

1. A process for producing polypropylene from a propylene stream comprising less than 99.5% by volume of polypropylene, the process comprising:
dehydrogenating a feed stream including propane in a dehydrogenation zone to provide an olefin steam, the olefin stream including propylene and propane; separating the olefin stream in a separation zone into a propylene stream and a propane stream, the propylene stream comprising less than 99.5% by volume of propylene; and, converting propylene from the propylene stream into polypropylene within a conversion zone.