1
John D Hottovy, David H Burns, Scott E Kufeld, Timothy Roetman, Ragavan Vaidyanathan: Diluent slip stream to give catalyst wetting agent. Phillips Petroleum Company, Polly C Owen, July 17, 2001: US06262191 (248 worldwide citation)

A process and apparatus for passing a polymerization effluent, comprising solid polymer, unreacted monomer, diluent and minor amounts of contaminants, to a high pressure flash where most of the fluid components are flashed and wherein a slip stream comprising diluent and minor amounts of monomer is ...


2
Joseph J Bergmeister, Scott E Kufeld, Max P McDaniel: Process for producing polyolefins. Phillips Petroleum Company, Lynda S Jolly, July 15, 1997: US05648439 (44 worldwide citation)

A process is provided to produce polyolefins having a multimodal molecular weight distribution at the molecular level by contacting at least one mono-1-olefin in a polymerization zone, under polymerization conditions, with two different types of supported chromium catalyst systems. The first catalys ...


3
Joseph J Bergmeister, Scott E Kufeld, Max P McDaniel: Process for producing polyolefins. Phillips Petroleum Company, Lynda S Jolly, April 29, 1997: US05624877 (28 worldwide citation)

A process is provided to produce polyolefins having a multimodal molecular weight distribution at the molecular level by contacting at least one mono-1-olefin in a polymerization zone, under polymerization conditions, with two different types of supported chromium catalyst systems. The first catalys ...


4
Scott E Kufeld, John H Tait, George O Obath, Wesley R Qualls, Garry A Marek: Solids concentration in slurry polymerization. Phillips Petroleum Company, Polly C Owen, July 16, 2002: US06420497 (28 worldwide citation)

An olefin polymerization apparatus is disclosed wherein monomer, diluent and catalyst are circulated in a continuous pipe loop reactor and an intermediate product slurry is recovered by a continuous product take off means. The intermediate product slurry is passed to a hydrocyclone to stratify polym ...


5
Scott E Kufeld, Thomas A Reid, John H Tait, David H Burns, Donald W Verser, Harvey D Hensley, David J Przelomski, Teddy H Cymbaluk, Robert K Franklin, Ethelwoldo P Perez, John D Hottovy: Slurry polymerization reactor having large length/diameter ratio. Chevon Phillips Chemical Company, April 25, 2006: US07033545 (26 worldwide citation)

A polymerization loop reactor including a loop reaction zone, a continuous takeoff, and a fluid slurry disposed in the reaction zone. A generally cylindrical wall defines the loop reaction zone. The length of the loop reaction zone and the nominal outside diameter of the generally cylindrical wall d ...


6
Scott E Kufeld, David H Burns, Ragavan Vaidyanathan: Direct recycle fractionation method using a swing column. Chevron Phillips Chemical Company, McDermott Will & Emery, May 6, 2003: US06559247 (23 worldwide citation)

A process and apparatus for passing a polymerization effluent, comprising solid polymer, unreacted monomer, diluent and minor amounts of contaminants, to a high pressure flash where most of the fluid components are flashed and wherein a slip stream comprising diluent and minor amounts of monomer is ...


7
Thomas A Reid, Scott E Kufeld, John H Tait, David H Burns, Donald W Verser: Process and apparatus for separating diluent from polymer solids. Chevron Phillips Chemical Company, Fletcher Yoder, January 4, 2005: US06838531 (22 worldwide citation)

Polymer solids are maintained in an intermediate pressure zone for a desired polymer solids residence time and then transferred to a purge zone or other lower pressure zone. An increase in the polymer solids residence time in the intermediate pressure zone allows more diluent to flash or separate, t ...


8
Robert R McElvain, John D Hottovy, Ralph W Romig, Donald W Verser, David H Burns, John H Tait, Richard Peacock, James E Hein, Scott E Kufeld, Carl W Fenderson, Anurag Gupta, Dale A Zellers, Penny A Zellers legal representative: Energy efficient polyolefin process. Chevron Phillips Chemical Company, Flecher Yoder, September 13, 2011: US08017701 (16 worldwide citation)

A manufacturing process for producing polyolefin, having a feed system, a reactor system including at least one polymerization reactor, a diluent/monomer recovery system, a fractionation system, and an extrusion/loadout system having an extruder. The manufacturing process is configured to consume le ...


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Robert R McElvain, John D Hottovy, Ralph W Romig, Donald W Verser, David H Burns, John H Tait, Richard Peacock, James E Hein, Scott E Kufeld, Carl W Fenderson, Anurag Gupta, Dale A Zellers, Penny A Zellers legal representative: Energy efficient polyolefin process. Chevron Phillips Chemical Company, Fletcher Yoder, March 6, 2012: US08128877 (10 worldwide citation)

A manufacturing process for producing polyolefin, having a feed system, a reactor system including at least one polymerization reactor, a diluent/monomer recovery system, a fractionation system, and an extrusion/loadout system having an extruder. The manufacturing process is configured to consume le ...