The Dow Chemical Company

Dow Technology Investments LLC

Dow Global Technolgoies LLC

Other

Northwestern University

Carnegie Mellon University

Mark McAdon

Peter N Nickias

Jasson T Patton

Liping L Zhang

Ernest R Frank

Francis J Timmers

Daniel D VanderLende

Tobin Jay Marks

James C Stevens

Ravi B Shankar

Brian W Kolthammer

Arun Basrur

Steven M Ueligger

Srikant Gopal

Albert Cheng-Yu Liu

Hirokazu Shibata

Krzysztof A Matyjaszewski

Richard E Campbell, Jr

David Gordon Barton

Adam Chojecki

Dean M Millar

Kishore K Kar

Jorge Soto

You-Xian Chen

Robert J Gulotty, Jr

Yu Liu

Robert E LaPointe

David J Schwartz

Daniela Ferrari

Gerolamo Budroni

Palanichamy Manikandan

Liting Li

Charles D Dukes

Oscar D Redwine

Neelesh J Rane

Bernard P Friedrichsen

Nathan T Kendall

Laura Mueller

Billy B Bardin

Methods of preparing a second high-efficiency, rhenium-promoted silver catalyst for producing alkylene oxide from an alkylene based on a first catalyst are disclosed and described. In accordance with the disclosed methods, the first and second catalysts include at least one promoter that includes a rhenium promoter. The target catalyst concentrations of one or more promoters of the at least one promoter on the second catalyst are determined based on the values of a catalyst reference property for the two catalysts and the concentration of the one or more promoters of the at least one promoter on the first catalyst. Suitable catalyst reference properties include carrier specific surface area and silver specific surface area. Reaction systems utilizing the first and second catalysts are also described.

Method of formulating alkylene oxide catalyst in relation to catalyst reference properties

A method for the production of ethylene oxide wherein the partial pressure of water vapor at the inlet of the reactor is at least about 8 kPa using a high purity carrier comprising alpha-alumina, a promoting amount of at least one Group IA metal, and a promoting amount of rhenium.

Method for the production of ethylene oxide

Catalyst compositions for producing mixed alcohols from a synthesis gas feed. The catalyst composition comprises a catalytic metal combination on a catalyst support, a first optional promoter and a second optional promoter, where the catalytic metal combination consists essentially of iridium, vanadium, and molybdenum.

Catalyst compositions for producing mixed alcohols

The invention generally relates to a method of inhibiting polymerization of vinylaryl monomers, a process for increasing number average molecular weight of a polystyrene, and to an inhibitor composition useful therein.

Compositions and method of inhibiting polymerization of vinyl-aryl monomers

A catalyst activator particularly adapted for use in the activation of metal complexes of metals of Group 3-10 for polymerization of ethylenically unsaturated polymerizable monomers, especially olefins, comprising a neutral (Lewis acid) or charge separated (cation/anion pair) comprising a boron ligand containing a fluorinated organic group containing from 10 to 1000 non-hydrogen atoms.

Perfluoronaphthyl substituted boron containing catalyst activator

A catalyst activator particularly adapted for use in the activation of metal complexes of metals of Group 3-10 for polymerization of ethylenically unsaturated polymerizable monomers, especially olefins, comprising two Group 13 metal or metalloid atoms and a ligand structure including at least one bridging group connecting ligands on the two Group 13 metal or metalloid atoms.

Catalyst activator

The present invention relates to &agr;-olefin/vinyl aromatic monomer interpolymers with characteristic signals in their carbon 13 NMR spectra. In particular, ethylene/styrene copolymers of the present invention have peaks in the carbon 13 NMR spectra which appear in the chemical shift range 43.70-44.25 ppm, preferably from 43.75-44.25 ppm and 38.0-38.5 ppm, said peaks being at least three times the peak to peak noise. The interpolymers are prepared by polymerizing the appropriate mixture of monomers in the presence of a catalyst such as racemic-(dimethylsilanediyl(2-methyl-4-phenylindenyl)) zirconium dichloride. The polymers of the present invention posses increased modulus as determined from both tensile stress/strain and dynamic mechanical data at comparable vinyl aromatic monomer levels.

&agr;-Olefin/vinylidene aromatic monomer and/or hindered aliphatic or cycloaliphatic vinylidene monomer interpolymers

Group 4 metal constrained geometry complexes comprising a fused ring indenyl derivative ligand, catalytic derivatives thereof, processes for preparing the same and their use as components of olefin polymerization catalysts are disclosed.

Fused ring substituted indenyl metal complexes and polymerization

Substituted indenyl containing metal complexes and olefin polymerization

Fused ring substituted indenyl metal complexes and polymerization process

A process for preparing addition polymerization catalysts having a limiting charge separated structure corresponding to the formula:

Homogeneous olefin polymerization catalyst by abstraction with lewis

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Midland, MI, United States of America

Mark McAdon