W. R. Grace Co.-Conn.

Univation Technologies, LLC

Theodore Duncan

Mark Williams Blood

Robert Darrell Olson

Randall L Force

George W Schwarz, Jr

James Leland Swecker, Ii

Cloid Russell Smith, Iii

Donald A Fischer

Sharon E Peterson

Daniel W Mosser

The present disclosure provides a process. In an embodiment, the process includes producing a propylene-based polymer in a gas-phase polymerization reactor () under polymerization conditions. The polymerization conditions include a combined propylene-plus-propane partial pressure from 290 psia to 450 psia. The process further includes maintaining the combined propylene-plus-propane partial pressure in the range from 290 psia to 450 psia while simultaneously: (i) reducing propylene partial pressure in the gas-phase polymerization reactor; (ii) adding propane to the gas-phase polymerization reactor; (iii) introducing at least one C4-C10 comonomer into the gas-phase polymerization reactor (); and forming a propylene/C4-C10 interpolymer in the gas-phase polymerization reactor ().

Propylene/butene interpolymer production system and method

Provided are systems and methods for separating a purge gas recovered from a polyethylene product. The method includes recovering a polyethylene product containing one or more volatile hydrocarbons from a polymerization reactor and contacting the polyethylene product with a purge gas to remove at least a portion of the volatile hydrocarbons to produce a polymer product having a reduced concentration of volatile hydrocarbons and a purge gas product enriched in volatile hydrocarbons. The purge gas product is compressed to a pressure of 2,500 kPaa to 10,000 kPaa, and is then cooled and separated into at least a first product, a second product, and a third product. A portion of one or more of the first, second, or third products is then recycled as a purge gas, to the polymerization reactor, or to the purge gas product enriched in volatile hydrocarbons prior to compression, respectively.

Systems and methods for recovering hydrocarbons from a polyolefin purge gas product

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Elkview, WV, United States of America

Theodore Duncan