Polypropylene production processes
AssigneeUop LLC
InventorsAdam J. Kanyuh, Michael J. Banach, Robert B. James
Life of this patent
Estimating the term…
Abstract
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.
Claims16
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.
A process for producing polypropylene from a propylene stream comprising less than 99.5% by volume of polypropylene, the process comprising:
- passing a feed stream to a dehydrogenation zone including a catalyst and being configured to dehydrogenate propane in the feed stream and provide an olefin stream, the olefin stream including propylene and propane;
- passing the olefin stream to a separation zone having one or more columns being operated to separate a propylene stream from the olefin stream, the propylene stream comprising between 95 and 99.5% by volume of propylene;
- passing the propylene stream to a conversion zone being operated to convert propylene into polypropylene;
- adjusting an operating parameter of at least one column in the separation zone to lower a purity of the propylene stream;
- and,
- monitoring a purity of the polypropylene from the conversion zone after the operating parameter of the at least one column of the separation zone has been adjusted.
Dependencies are inferred from the claim text.