Union Carbide Chemicals & Plastics Technology Corporation

Union Carbide Corporation

Union Carbide Chemicals and Plastics Company, Inc.

Other

Univation Technologies, LLC

Kiu H Lee

Fathi David Hussein

Frederick John Karol

Daniel Paul Zilker, Jr

Ronald Steven Eisinger

Kevin Joseph Cann

Arthur E Marcinkowsky

Edgar C Baker

David N Edwards

Ping P Cai

Allen Noshay

Sari B Samuels

Mark Gregory Goode

John Roberts Parrish

Jose Fernando Cevallos-Candau

Mahmoud R Rifi

Ivan Jeremy Hartley

Roger B Painter

Xinlai Bai

Gary S Cieloszyk

Lance Lyle Jacobsen

Christopher Scott Hunnisett

Han-Tai Liu

Mark J Kriss

John Robert Briggs

Robert J Jorgensen

Leonard Sebastian Scarola

Clark Curtis Williams

William Albert Matthews

Paul Kevin Samples

John Henry Moorhouse

David Merrill Rebhan

Seung J Rhee

James W Nicoletti

Thomas James McNeil

Francis G Stakem

Daniel M Hasenberg

Gyung-Ho Song

Henry B Hinckley

William Jene Price

Albert George Dietz, Iii

Robert Steven Eisinger

Donald Robert Fields

There is provided an automated sampling system for taking polymer samples from a fluidized bed, gas phase reaction system which utilizes at least one volatile, hazardous monomer. The sampling system provides minimal sample-to-sample variability, improved reactor control and polymerization operability which minimizing potential exposure or release of the volatile, hazardous monomers.

Sampling system for fluidized bed gas phase polymerization reaction systems

The dynamic fluidized-bed level in an olefin polymerization reactor is determined by radar or ultrasound waves. Echoes are processed to take into account the turbulence caused by bubbles, which can be as large as four meters in diameter, bursting on the surface, expelling resin particles into the freeboard above the dynamic fluidized-bed level.

Detection of dynamic fluidized bed level in a fluidized bed polymerization reactor using ultrasonic waves or microwaves

A method is provided to monitor, detect and correct local defluidization and channeling in fluidized-bed reactors for polymerization of olefin and/or diolefin polymers. The detection is preferably conducted by (i) continuously and/or intermittently comparing a signal which is a function of the currently measured fluidization bulk density with a signal which is a function of the time-averaged baselines of fluidized bulk density.

Method of detecting and correcting local defluidization and channeling in fluidized-bed reactors for polymerization

A process for starting a polymerization of butadiene to produce polybutadiene in a gas phase reactor having a seed bed which comprises (i) passivating the reactor and the seed bed by introducing an aluminum alkyl having a concentration ranging from about 2,000 to 20,000 ppm and (ii) feeding the catalyst and co-catalyst to the reactor before the addition of the butadiene.

Start-up process for gas phase production of polybutadiene

Addition of water to a gas phase olefin polymerization reactor in amounts greater than 3 ppmv permits an increase in the level of condensable gas and facilitates operation of the reactor at an elevated dew point by ameliorating electrostatic phenomena in the reactor; the process inhibits sheeting.

Static control in olefin polymerization

There is provided process for producing an ethylene-alpha-olefin polymer at a polymerization reaction temperature in excess of the softening temperature of the polymer in a gas-phase fluidized-bed reactor in the presence of a polymerization catalyst and wherein the polymerization reaction is conducted in the presence of an inert particulate material, the improvement comprising: commencing polymerization by polymerizing an ethylene propylene rubber having a crystallinity ranging from about 4 to 18 percent as measured by differential scanning calorimetry.

Process for conditioning a gas-phase reactor to produce an

A improved process is provided for polymerization of olefin and/or diolefin polymer, using sonic cleaning devices, with optimum design and operation, to eliminate or reduce reactor fouling and/or sheeting.

Gas phase fluidized bed polymerization process using sonic cleaner with

A continuous process for the polymerization of one or more alpha-olefins in the gas phase in the presence of a chromium based catalyst, under polymerization conditions including the reaction temperature, the pressure, and the target oxygen to alpha-olefin molar ratio operating point required for desired resin properties.

Process control in the presence of chromium based catalysts

Control of a gas phase polymerization reactor is performed with the product melt index, the reaction temperature, and the partial pressure of the controlling reactant.

Process for controlling gas phase fluidized bed polymerization reactor

A method for inhibiting polymer build-up in a recycle line and a heat exchanger during a polymerization process of one or more alpha olefins, particularly sticky polymers, which method comprises introducing as an antifouling an alcohol having 1 to 10 carbon atoms, an alkyl or cycloalkyl ether having 2 to 20 carbon atoms, or a mixture thereof at one or more locations in the recycle gas line in an amount sufficient to inhibit polymer buildup.

Process for reducing polymer build-up in recycle lines and heat

A process for controlling the particle growth of a polymer in a gas phase polymerization reaction by using an inert particulate material and an unsupported liquid polymerization catalyst.

Process for controlling particle growth during production of sticky

A method for passivating internal surfaces of a reactor system during start-up and shutdown of an alpha olefin polymerization or copolymerization reaction by adding a passivation agent such as a dialkyl zinc compound, an alcohol, or an epoxide, to the reactor prior to exposing the internal reactor surfaces to air or moisture before reaction initiation and/or after reaction ceases.

Process for passivation of a reactor after shutdown of alpha olefin

A process for the production of EPM or EPDM comprising contacting ethylene, propylene, and, optionally, one or more dienes, in a fluidized bed, at a temperature at or above the sticking temperature of the product resin, under polymerization conditions, with

Process for the production of sticky polymers

An improved method for polymerizing one or more polyolefins in the presence of a transition metal catalyst in at least one gas phase fluidized bed reactor, the improvement comprises generating at least one low frequency, high pressure sound wave inside a reactor system, which wave has sufficient frequency and pressure to dislodge and/or prevent particle build-up on interior surfaces of the reactor system.

Gas phase fluidized bed polyolefin polymerization process using sound

A method for reducing sheeting during polymerization of alpha-olefins in a fluidized bed employing catalysts prone to cause sheeting which comprises feeding a material carrying a static electric charge opposite to the static charge in said bed, said opposite charge of said material being generated by passing said material in contact with a surface adapted to impart said static electric charge to said material opposite the charge existing in said bed.

Method for reducing sheeting during polymerization of .alpha.-olefins

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South Charleston, WV, United States of America

Kiu H Lee