US 9,809,662 B2
Polypropylene production processes
Adam J. Kanyuh, Streamwood, IL (US); Michael J. Banach, North Barrington, IL (US); and Robert B. James, Northbrook, IL (US)
Assigned to UOP LLC, Des Plaines, IL (US)
Filed by UOP LLC, Des Plaines, IL (US)
Filed on Jun. 2, 2015, as Appl. No. 14/728,599.
Prior Publication US 2016/0355617 A1, Dec. 8, 2016
Int. Cl. C08F 110/06 (2006.01); C07C 5/333 (2006.01); C07C 11/06 (2006.01)
CPC C08F 110/06 (2013.01) [C07C 5/333 (2013.01)] 16 Claims
OG exemplary drawing
 
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;
converting propylene from the propylene stream into polypropylene within a conversion zone;
adjusting an operating parameter of the separation zone to lower a purity of the propylene stream; and,
monitoring a purity of polypropylene from the conversion zone after the operating parameter of the separation zone has been adjusted.