Exxon Chemical Patents, Inc.

Univation Technologies, LLC

Exxonmobil Chemical Patents Inc.

Marc L DeChellis

Robert Olds Hagerty

John R Griffin

Michael E Muhle

James McLeod Farley

Kevin Bruce Stavens

D Brett Fischbuch

Harry William Deckman

Keith Holroyd Kuechler

Agapios Kyriacos Agapiou

Richard B Pannell

Eric John Markel

F David Hussein

Ryan Winston Impelman

William Anthony Lamberti

David Jack Sandell

Gary F Janda

Joseph Moebus

Daniel P Zilker

David R Lumgair, Jr

Russell D Sellen

Charles Raymond Buhler, Iv

Ian D Burdett

Steve K Ackerman

Minquan Cheng

Corrine L Brandl

Judson Sid Clements

Richard J Stolz

David M LaBorde

Gerardo Corona

Judson S Clements

Joseph A Moebus

David J Sandell

A process for producing polyethylene polymers including contacting ethylene and at least one Cto Calpha-olefin comonomer with a polymerization catalyst on a particulate support in a fluidized bed polymerization reactor under conditions effective to polymerize at least part of the ethylene and comonomer and produce the polyethylene polymers, wherein the support has a dparticle size as measured by laser diffraction of at least 18 microns, is provided.

Process for producing polyethylene polymers

In a gas phase fluidized bed polymerization process for the production of polyolefin polymers, such as polyethylene polymers or polypropylene polymers, loss of ethylene or propylene accompanying inert gas purging is reduced by passing an ethylene- or propylene-containing purge stream through a vent column to contact a hydrocarbon liquid flowing through the vent column contercurrent to the purge stream whereby unreacted ethylene or propylene in the purge stream portion is dissolved in the hydrocarbon liquid to produce an ethylene- or propylene-enriched liquid stream and an ethylene- or propylene-depleted gaseous stream. The ethylene- or propylene-enriched liquid stream is then recycled to the fluidized bed reactor, while at least part of the ethylene- or propylene-depleted gaseous stream is purged.

Polymerization processes

Generally, a method of monitoring a polymerization reaction in a fluid bed reactor to generate, in on-line fashion, data indicative of the imminent occurrence of a discontinuity event (for example, sheeting) and optionally also control the reaction to prevent the occurrence of the discontinuity event is provided. Typical embodiments include the steps of generating in on-line fashion at least one of bed static data indicative of static charge in the fluidized bed and carryover static data indicative of carryover static; and generating at least one of temperature data (in on-line fashion using at least one monitored reaction parameter) indicative of a first temperature and acoustic emission data indicative of resin stickiness in the reactor, where the first temperature is indicative of at least one of degree of resin stickiness in the reactor and a characteristic of melting behavior of polymer resin in the reactor in the presence of at least one diluent.

Method for on-line monitoring and control of polymerization processes and reactors to prevent discontinuity events

The present invention relates to a continuous gas phase process comprising polymerizing one or more hydrocarbon monomer(s) in a fluidized bed reactor in the presence of a Ziegler-Natta-type catalyst system and a condensable fluid for a period of at least 12 hours where the bed temperature is less than the Critical Temperature and the dew point temperature of the gas composition in the reactor is within 25&#xb0; C. of the bed temperature.

Polymerization process

The present invention relates to a continuous gas phase process comprising polymerizing one or more hydrocarbon monomer(s) in a fluidized bed reactor in the presence of catalyst system or polymerization catalyst and a condensable fluid for a period of at least 12 hours where the bed temperature is less than the Critical Temperature and the dew point temperature of the gas composition in the reactor is within 25&#xb0; C. of the bed temperature.

Disclosed is a system of making an olefin derivative from a dilute olefin feed. Dilute olefin is sent to an olefin reaction unit to form an olefin derivative product. The olefin derivative product is recovered from the reaction unit while a vent stream is also removed. Olefin is separated from the vent stream, and the olefin is sent to the olefin reaction unit for additional processing.

Production of olefin derivatives

The invention is directed toward polymerizing or copolymerizing alpha-olefins either alone or in combination with one or more other alpha-olefins in the presence of a metallocene catalyst in a gas phase reactor having a fluidized bed and a fluidizing medium such that the fluidizing medium entering the reactor comprises a gas and a liquid phase.

Process for polymerizing monomers in fluidized beds

The invention is directed toward polymerizing or copolymerizing alpha-olefins either alone or in combination with one or more other alpha-olefins in a gas phase reactor having a fluidized bed and a fluidizing medium such that the fluidizing medium entering the reactor comprises a gas and a liquid phase.

The invention is directed toward polymerizing alpha-olefins either alone or in combination with one or more other alpha-olefins utilizing a bulky ligand transition metal catalyst in a gas phase fluidized bed polymerization reactor operating in condensed mode.

A process for deactivating Ziegler-Natta and metallocene catalysts or catalyst systems 'such systems are typically used for olefin polymerization'. The process includes heating the active catalyst or catalyst system to a temperature sufficient to drive off volatile constituents, and to form complexes and compounds that are non-reactive or less reactive with ambient air than the active catalyst or catalyst system. The process includes steps for safe deactivation including scrubbing to substantially eliminate corrosive compounds, and burning volatile chemicals in a flare. This process essentially eliminates the production of hazardous classification waste from conventional water catalyst deactivation techniques.

Process for deactivating Ziegler-Natta and metallocene catalysts

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Houston, TX, United States of America

Marc L DeChellis