Shell Oil Comapny

Carma J Gibler

Linda R Chamberlain

David J St Clair

James R Erickson

Robert Charles Bening

Stanley E Wilson

Joe J Flores

Thomas F Brownscombe

Richard A Kemp

Miguel Prado

Zaida Diaz

Ajay M Madgavkar

Craig A Stevens

David Werner Daum

Ronald J Hoxmeier

James Henry Miller

David Michael Austgen, Jr

Roy Arthur Parker

A method is provided to hydrogenate a polymer containing ethylenic unsaturation comprising the steps of: providing a solution or suspension of the polymer containing ethylenice unsaturation with an amount of Group VIII metal alkoxide or carboxylate and metal alkyl hydrogenation catalyst effective to permit hydrogenation of the ethylenic unsaturation upon exposure to hydrogen; exposing the polymer solution or suspension to a hydrogen partial pressure for a time period sufficient to hydrogenate greater than about 90 percent of the ethylenic unsaturation; adding additional Group VIII metal alkoxide or carboxylate and metal alkyl hydrogenation catalyst to the polymer solution or suspension after greater than about 90 percent of the ethylenic unsaturation has been hydrogenated; mixing the hydrogenated polymer solution or suspension with the additional Group VIII metal alkoxide or carboxylate and metal alkyl hydrogenation catalyst with an aqueous solution of an acid; and separating a hydrogenated polymer solution or suspension that contains less than about 0.8 percent by weight water from the aqueous solution. The invention utilizes a surprising discovery that addition of the hydrogenation catalyst above that necessary or desirable for hydrogenation of ethylenic unsaturation results in improved separation of the catalyst metals, and the aqueous phase, from the polymer solution or suspension.

Hydrogenation of polymers

A process for making polymers of conjugated dienes which contain hydroxyl groups in the diene blocks which comprises

Hydroxyl functional derivatives of epoxidized diene block copolymers and

This is a process for the hydrogenation of conjugated diolefin polymers which comprises polymerizing or copolymerizing at least one conjugated diolefin with an organo alkali metal polymerization initiator in a suitable solvent thereby creating a living polymer, terminating the polymerization by the addition of hydrogen and effecting selective hydrogenation of the unsaturated double bonds in the conjugated diolefin units of the terminated polymer by contacting the polymer with hydrogen in the presence of an organo alkali metal promoter and Tebbe's reagent.

Selective hydrogenation of conjugated diolefin polymers with Tebbe's

A process is provided comprising the steps of contacting a Group VIII metal hydrogenation catalyst residue containing polymer solution with from about 2 to about 50 parts by weight water based on 100 parts by weight of polymer solution, centrifuging the polymer from metal containing particles with a centrifugal force such that the centrifugal force times the time duration of centrifugation divided by the viscosity of the polymer solution equals or exceeds about 50 G-minutes/cp, and recovering a polymer solution comprising less than 10 ppm by weight, based on the polymer, of the Group VIII metal.

Removal of nickel catalyst from polymer solutions by water addition and

A process is provided comprising the steps of contacting a Group VIII metal hydrogenation catalyst residue containing polymer solution with water and a trialkyl aluminum, separating the residue from the solution and recovering a polymer solution preferably comprising less than 5 ppm by weight, based on the solution, of the hydrogenation catalyst residue metal.

Removal of hydrogenation catalyst from polymer solutions by trialkyl

The present invention is an improvement upon a process for hydrogenating a diene polymer by contacting the polymer in the presence of hydrogen with a titanium hydrogenation catalyst. The improvement comprises preventing discoloration of the hydrogenated polymer by treating it with water, a peroxide or alcohol in the absence of oxygen and adding a non-phenolic antioxidant to the polymer.

Color prevention in titanium catalyzed hydrogenated diene polymers

This is a process for the partial hydrogenation of conjugated diolefin polymers which comprises polymerizing at least one conjugated diolefin with an organo alkali metal polymerization initiator in a suitable solvent thereby creating a living polymer comprising (1) ethylenic unsaturation between backbone carbons wherein at least one of the doubly bound backbone carbons is substituted and (2) ethylenic unsaturation which is not between doubly bound backbone carbons wherein at least one is substituted, terminating the polymerization, and effecting selective hydrogenation of the ethylenic unsaturation in the conjugated diolefin units of the terminated polymer which is not between doubly bound backbone carbons wherein at least one is substituted, by contacting the polymer with hydrogen in the presence of no more than 0.02 mM of catalyst per gram of polymer of a bis(cyclopentadienyl)titanium catalyst.

Selective partial hydrogenation of conjugated diolefin polymers

A process is provided comprising the steps of contacting a Group VIII metal hydrogenation catalyst residue containing polymer solution with a chelating resin, the chelating resin comprising iminodiacetate ions, and recovering a polymer solution comprising less than 5 ppm by weight, based on the solution, of the hydrogenation catalyst residue metal. In a preferred embodiment, the chelating resin is contacted with the hydrogenation catalyst residue containing polymer solution by mixing particles of the chelating resin with the hydrogenation catalyst residue containing polymer solution under agitation, and the polymer solution containing less than 5 ppm of hydrogenation catalyst metals is recovered from the chelating resin and resulting precipitated hydrogenation catalyst residues by filtration.

Growing community of inventors

Houston, TX, United States of America

Carma J Gibler