Phillips Petroleum Company

John P Hogan

Robert L Banks

Donald D Norwood

Benny E Nasser, Jr

Joseph A Delap

Eric T Hsieh

Donald R Witt

Phil M Stricklen

Charles R Nease

James C Randall

Charles R Rease

Processes are disclosed for the vapor phase polymerization of gaseous monomers, particularly olefins such as propylene and ethylene. A gaseous stream containing at least one gaseous monomer is passed upwardly through a series of fluidized bed reaction zones of successively smaller diameter. A polymerization catalyst is introduced into an uppermost one of said zones. The gaseous monomer is polymerized to form solid polymer particles which are a part of a fluidized bed in each zone, and which flow downwardly through the series of reaction zones, thereby decreasing a volumetric flow rate of the upwardly flowing gaseous stream as the stream moves upward. A velocity of the upwardly flowing gaseous stream is maintained at a sufficient level to fluidize the fluidized bed in each successive zone at least partially by means of the smaller diameter of each successive zone. Techniques are disclosed for dividing zones into subzones thus multiplying the effective number of stages of the reactor.

Gas phase polymerization in multi-stage fluid beds

A process has been discovered for the polymerization of ethylene and mixtures of ethylene with at least one other mono-1-olefin by employing a polymerization catalyst that produces polymers containing terminal vinyl unsaturation wherein such catalyst is exposed to a modifying agent prior to or during the polymerization reaction.

Ethylene homopolymer and copolymer polymerization process and the

A process for copolymerizing ethylene with another monoolefin is described wherein the other monoolefin is incorporated into the polymer at very high efficiencies and in several instances the copolymer produced contains a higher concentration of the comonomer than the gas phase in the polymerization zone. A novel ethylene/1-hexene copolymer having very high relative comonomer dispersities (99% or higher, and even above 100%) is also described.

Low density polyethylene

A process for the removal of CO.sub.2 from a gaseous stream containing at least one C.sub.2 to C.sub.4 olefin is provided comprising contacting said stream with a regenerable calcined alkali metal compound-treated alumina.

Removal of carbon dioxide from olefin containing streams

1. Normally solid polypropylene, consisting essentially of recurring propylene units, having a substantial crystalline polypropylene content.

Solid polymers of olefins and production of such polymers

Small amounts of an aluminum alkyl or a dihydrocarbylmagnesium compound are used in slurry olefin polymerization employing a silica supported chromium catalyst in order to reduce the induction period and increase catalyst activity while having only a modest effect on polymer properties.

Small amounts of aluminum alkyl or dihydrocarbyl magnesium in slurry

Solid polymers of olefins having at least three carbon atoms per molecule and methods of making such polymers with a chromium-containing catalyst or organometal catalyst system.

Solid polymers of 4-methyl-1-pentene

A multiple zone apparatus for treating particulate solids and a method for treating particulate solids in seriatim multiple zones are provided. Particulate solids treatment such as the activation of chromium-silica olefin polymerization catalyst is carried out continuously by employing multiple fluidized beds with overflow of solids from one bed to the next lower bed. Each bed has its own source of heat and fluidizing gas to permit step-wise treatment of the particulate solids as particles pass through the system. Temperatures in each zone can be regulated for treatment of the solids in a predetermined manner. In a preferred embodiment each bed is transversely divided with a partition containing a hole sized for forwarding flow from the solids inlet side of the bed to the outlet side without backflow.

Continuous, multiple zone fluidized bed for particle treater

A chromium-containing catalyst utilizing spray dried silica gel containing titanium is used to produce olefin polymers exhibiting an outstanding resistance to environmental stress cracking.

Polymerization process using spray dried titanium-containing catalyst

Spray dried titanium-containing catalyst for stress crack resistant

Ethylene homopolymers and copolymers are made in a particle form process over a mixed catalyst comprising several portions of the same or different supported chromium components and metal promoted variations thereof in which each portion is activated at a different temperature, thereafter combined, and the composite, or each activated portion before being combined, is post treated with a hydrocarbyl aluminum hydrocarbyloxide. Broad molecular weight polymers are produced having excellent die swell characteristics and acceptable environmental stress cracking resistance and flow properties; this is achieved and while at the same time realizing high productivities.

Mixed hydrocarbyloxide treated catalyst activated at different

Olefins are polymerized with a catalyst which forms on mixing a supported chromium oxide composite and a silane adjuvant. This system allows the production of polymer of a given melt index at a higher temperature, thus increasing the production rate and is of particular utility in solution polymerizations designed to produce ethylene polymers and copolymers.

Silane adjuvant for chromium oxide catalyst

In a process for producing olefin polymers, a hydrocarbylaluminum hydrocarbyloxide such as diethylaluminum ethoxide is introduced into the reaction zone in a stream separate from the catalyst to reduce fouling.

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Bartlesville, OK, United States of America

John P Hogan