Univation Technologies, LLC

Union Carbide Chemicals & Plastics Technology Corporation

Ronald Steven Eisinger

Mark Gregory Goode

Kevin Joseph Cann

John H Moorhouse

Kiu H Lee

Fathi David Hussein

Maria A Apecetche

Daniel Paul Zilker, Jr

Michael A Kinnan

Cliff Robert Mure

Stephen Paul Jaker

James Leland Swecker, Ii

David Mason Gaines

Michael E Muhle

F David Hussein

Mark Bradley Davis

Fred David Ehrman

Timothy Charles Frank

Ping P Cai

Gary Harry Williams

Maria Pollard

Bruce S Holden

Daniel P Zilker

David Merrill Rebhan

Ian D Burdett

David N Edwards

Barbara J Kopp

Christopher Scott Hunnisett

Daniel M Hasenberg

Joseph Patrick Welch

Ronald Irvin Raether

David Nunn Jones

Stephen P Jaker

James Leland Swecker

Embodiments disclosed herein generally relate to olefin polymerization catalysts, and more specifically to chromium-based catalysts and methods of use of chromium-based catalysts for the production of polyolefins, and even more specifically to methods for controlling or tailoring the flow index response of chromium-based catalysts through the controlled addition of a reducing agent to the catalysts under controlled mixing conditions.

Modified chromium-based catalysts and polymerization processes for using the same

Methods for the removal of impurities, for example, carbon monoxide, from a polymerization feed streams are provided.

Methods for the removal of impurities from polymerization feed streams

Apparatus and methods for separating volatiles from particulates are provided. The apparatus includes a separator having an internal volume and a fluid discharge outlet, a particulate discharge outlet, a particulate inlet, and a fluid inlet disposed on the separator and in fluid communication with the internal volume. The particulate inlet is disposed toward a first end of the separator and the fluid inlet is disposed toward a second end of the separator. The fluid inlet includes one or more openings disposed through a sidewall of the separator.

Apparatus and methods for separating volatiles from particulates

Various methods and systems for using oxygen in a polyolefin polymerization reactor system are provided. In certain embodiments, the methods are performed in conjunction with a polymerization reactor system such as a gas-phase reactor system.

Systems and methods for fabricating polyolefins

Systems and methods for removing impurities from a feed fluid in a single vessel. A method generally includes, in single vessel, contacting a feed fluid passing through the vessel with a copper-based material for removing oxygen from the feed fluid; and contacting the feed fluid passing through the vessel with an adsorbent for removing at least one of water, carbon dioxide, and oxygenated hydrocarbons from the feed fluid.

Systems and methods for removing impurities from a feed fluid

Disclosed herein are various processes, including continuous fluidized-bed gas-phase polymerization processes for making a high strength, high density polyethylene copolymer, comprising (including): contacting monomers that include ethylene and optionally at least one non-ethylene monomer with fluidized catalyst particles in a gas phase in the presence of hydrogen gas at an ethylene partial pressure of 100 psi or more and a polymerization temperature of 120&#xb0; C. or less to produce a polyethylene copolymer having a density of 0.945 g/cc or more and an ESCR Index of 1.0 or more wherein the catalyst particles are prepared at an activation temperature of 700&#xb0; C. or less, and include silica, chromium, and titanium.

Blow molding polyethylene resins

Disclosed herein are various methods and systems for gas and liquid phase polymer production. In certain embodiments, the methods comprise manipulating properties of polymers produced by adjusting the hydrogen feed rate.

Systems and methods for fabricating polymers

Disclosed herein are various processes, including continuous fluidized-bed gas-phase polymerization processes for making a high strength, high density polyethylene copolymer, comprising (including): contacting monomers that include ethylene and optionally at least one non-ethylene monomer with fluidized catalyst particles in a gas phase in the presence of hydrogen gas at an ethylene partial pressure of 100 psi or more and a polymerization temperature of 105&#xb0; C. or less to produce a polyethylene copolymer having a density of 0.945 g/cc or more and an ESCR Index of 1.0 or more wherein the catalyst particles are prepared at an activation temperature of 700&#xb0; C. or less, and include silica, chromium, and titanium.

Embodiments of the present invention include a method of polymerizing olefins comprising contacting olefins with a catalyst composition made by the process of combining a hindered polyalicyclic alkyl catalyst precursor with a particulate inorganic oxide for a deposition time greater than 2 hours to form a catalyst composition. Embodiments of the present invention also include catalyst compositions comprising a hindered polyalicyclic alkyl catalyst precursor made by the process of combining the hindered polyalicyclic alkyl catalyst precursor with a particulate inorganic oxide for a deposition time greater than 2 hours to form the catalyst composition. In one embodiment, the hindered polyalicyclic alkyl catalyst precursor is formed by first combining an acid, a compound having the formula RX, and a metal oxide selected from the group consisting of Group 3 to Group 10 oxide compounds to produce a catalyst precursor; characterized in that R is selected from the group consisting of hindered polyalicyclic alkyls, and substituted derivatives thereof, and X is selected from the group consisting of any suitable leaving group.

Hindered polyalicyclic alkyl catalysts and their use in a gas-phase polymerization reactor

A method for olefin polymerization is provided. A feed stream comprising more than 0.1 ppm by volume of oxygen and 0.3 ppm by volume of water is passed through a first packed bed to selectively remove at least a portion of the oxygen. The feed stream is then passed through a second packed bed to selectively remove at least a portion of the water, providing a purified feed stream comprising less than 0.1 ppm by volume of oxygen and 0.3 ppm by volume of water. Both the first and second packed beds operate at a temperature of from about 0&#xb0; C. to about 50&#xb0; C. The purified feed stream is then passed to a polymerization reactor.

Feed purification at ambient temperature

This invention relates to processes for transitioning among polymerization catalyst systems, preferably catalyst systems, which are incompatible with each other. Particularly, the invention relates to processes for transitioning among olefin polymerization reactions utilizing Ziegler-Natta catalyst systems, metallocene catalyst systems and chromium-based catalyst systems.

Processes for transitioning between various polymerization catalysts

Processes for transitioning between chrome-based and mixed polymerization catalysts

A process comprising the steps of: (1) pressurizing a particulate material in bead or pellet form in a vessel to an elevated pressure with a first gas, (2) reducing the particulate material under the elevated pressure to a fine consistency, (3) conveying the fine consistency particulate material into a receiving vessel.

Process for handling particulate material at elevated pressure

There is provided a post-reactor process for a polymer, especially an elastomeric polymer, prepared by a gas phase polymerization in the presence of an inert particulate material comprising: introducing the polymer containing inert particulate material into a polishing vessel in the presence of a fluidizing gas under polishing conditions.

Growing community of inventors

Charleston, WV, United States of America

Ronald Steven Eisinger