Chevron Phillips Chemical Company LP

Other

Phillips Petroleum Company

John D Stewart

Max P McDaniel

Qing R Yang

John D Hottovy

Ted H Cymbaluk

Albert P Masino

Elizabeth Ann Benham

Scott E Kufeld

Tony R Crain

Joel A Mutchler

Bruce E Kreischer

Ralph W Romig

Anurag Gupta

Robert R McElvain

Catherine M Gill

Anne M Balinsky

Eric D Schwerdtfeger

Ashish M Sukhadia

Rex L Bobsein

Steven J Secora

Gregory G Hendrickson

Eric T Hsieh

Joseph J Bergmeister

Joseph S Shveima

Charles R Nease

Gerhard K Guenther

George R Rajaendran

William L Valerioti

Elliott W Johnson

Richard A Hernandez

Susannah Lane

Lonnie J Dodson

Qing Yang

Robert R Mcelvain

A process is described for introducing a catalyst into a polymerization zone by detecting one or a combination of (i) a change in a concentration of the catalyst in a catalyst feed stream upstream of the polymerization zone, (ii) a change in a concentration of monomer in the polymerization zone, and (iii) a change in a polymer production rate of the polymerization zone, adjusting a first catalyst flow rate of the catalyst in the catalyst feed stream to a second catalyst flow rate based on the one or a combination of (i), (ii), and (iii), and introducing the catalyst into the polymerization zone downstream of a location in the catalyst feed stream where the step of adjusting is performed. A catalyst injection system for carrying out such a process is also provided.

Polymerization catalyst delivery

A reactor system containing one or more loop reactors for olefin polymerization is provided. The loop reactors include vertical sections, elbow sections, and/or horizontal sections connected into one or more loop reaction zones to polymerize an olefin monomer in the presence of a liquid diluent into a slurry comprising particles of a polyolefin polymer. The reactor system footprint is reduced to increase production efficiency and save cost, while maintaining a high processing capacity. In one embodiment a horizontal length (L) of at least one horizontal section is greatly reduced with maintained processing capacity. In another embodiment, at least one elbow section of the reactor system is configured to maintain a Dean number (D) of the slurry flowing therein to be higher than 3,000,000.

Elbow and horizontal configurations in a loop reactor

Methods for controlling properties of an olefin polymer using an alcohol compound are disclosed. The MI and the HLMI of the polymer can be decreased, and the Mw and the Mz of the polymer can be increased, via the addition of the alcohol compound.

Methods of controlling dual catalyst olefin polymerizations with an alcohol compound

Methods for controlling dual catalyst olefin polymerizations with an alcohol compound

Loop reactors for olefin polymerization and processes utilizing such loop reactors are described herein. In one or more embodiments, the loop reactor generally includes a plurality of vertical sections; a plurality of elbow sections connecting the vertical sections to either a horizontal section having a horizontal length (L) or another elbow section, at least one elbow section having an internal diameter (d), a radius (R) of an inner curvature and a chord length (W) and wherein the horizontal length (L) is from 0 feet to 3 feet, the chord length (W) is 250 inches or less and a ratio (R/d) of the radius (R) of the inner curvature to the internal diameter (d) of the at least one elbow section is maintained from 2 to 4; and at least one loop reaction zone configured to polymerize an olefin monomer in the presence of a liquid diluent into a slurry comprising particles of a polyolefin polymer.

Methods for removing polymer skins or build-up from reactor walls in polymerization reactor systems containing a loop slurry reactor are disclosed. Such methods can employ removing some or all of the comonomer from the reactor system in combination with increasing the polymerization temperature of the loop slurry reactor.

Methods for removing polymer skins from reactor walls

A copolymer of ethylene and a higher alpha-olefin having broadened melt processing windows and reduced melt fracture can be produced using a chromium-containing catalyst system and a trialkyl boron cocatalyst. The polymerization process must be carefully controlled to produce a copolymer resin that easily can be made into articles of manufacture.

Olefin polymerization process

A process to control the heat transfer coefficient in slurry olefin polymerization processes comprising shocking the polymerization reactor is provided. This shock comprises quickly decreasing and then restoring to normal operating conditions, the higher alpha-olefin comonomer to ethylene monomer weight feed ratio.

Ethylene polymerization processes and products thereof

A universal spreader attachment consisting of an inverted triangular hopper hung from the cross-brace support of the handlebars of a lawnmower, with holes drilled in the bottom of the hopper to allow the substance being spread to disperse onto the lawn. The holes are opened and closed by moving a sliding member, which has corresponding holes drilled into it.

Lawnmower attachment spreader

Growing community of inventors

Friendswood, TX, United States of America

John D Stewart