The Dow Chemical Company

Dow Agrosciences LLC

Hawk S Wan

Robert D Mahoney

Richard Allen Lundgard

Henry N Beck

Mark F Sonnenschein

Jiro Kawamoto

H Nelson Beck

Brian John Schoeman

Kenneth Michael Larson

Dana Alan Livingston

Ritchie A Wessling

Chieh-Chun Chau

Edgar S Sanders, Jr

Kent D Campbell

Steven Roy Lakso

Timothy M Finney

2-Chloro-5-trichloromethylpyridine is obtained by chlorinating &#x3b2;-picoline in the vapor phase using a Mordenite zeolite or a supported palladium catalyst.

Vapor phase catalytic chlorination of &#x3b2;-picoline

A mixture containing 5,6-dichloro-2-trichloromethylpyridine and 3,6-dichloro-2-trichloromethylpyridine enriched in 3,6-dichloro-2-trichloro-methylpyridine is obtained by chlorinating 6-chloro-2-trichloromethylpyridine in the vapor phase using a Type L zeolite catalyst.

Preparation of 3,6-dichloro-2-trichloromethylpyridine by vapor phase chlorination of 6-chloro-2-trichloromethylpyridine

The invention relates to a process for preparing a microporous membrane from an unsulfonated poly(phenylene sulfide) polymer by forming a mixture of an unsulfonated poly(phenylene sulfide) polymer, an amorphous polymer, and optionally a plasticizer, heating the resulting mixture, extruding or optionally casting the mixture into a membrane, controlled cooling (quenching) or coagulating the membrane, and leaching the membrane, while optionally drawing the membrane before, during, and/or after leaching.

Process for making a microporous membrane from a blend containing a poly

The present invention relates to a process for preparing a microporous permselective membrane from a poly(phenylene sulfide) (PPS) polymer, an organic compound which substantially solubilizes the PPS below its melting point to form a homogenous mixture, heating the resulting mixture, extruding or casting the mixture into a membrane (fiber or film), quenching or coagulating the membrane, and leaching the membrane, while optionally drawing the membrane before, during, after leaching, or a combination thereof. In one embodiment, the solvent optionally includes an organic non-solvent to assist in obtaining the desired microporsity. The permselective polymers are useful to separate gaseous or liquid components from a mixture of components.

Process of making microporous hollow fiber or film membrane of

The invention relates to a process for preparing a microporous membrane from an unsulfonated poly(etheretherketone)-type polymer by forming a mixture of an unsulfonated poly(etheretherketone)-type polymer, a low melting point crystallizable polymer, and a plasticizer, heating the resulting mixture, extruding or casting the mixture into a membrane, quenching or coagulating the membrane, and leaching the membrane, while optionally drawing the membrane before, during, after leaching, or a combination thereof.

Process of making microporous membranes from poly(etheretherketone)-type

This invention relates to semi-permeable isotropic syndiotactic polystyrene microporous membranes and processes for preparing such membranes.

Isotropic microporous syndiotactic polystyrene membranes and processes

This invention relates to semi-permeable anisotropic syndiotatic polystyrene microporous membranes and a process for preparing such membranes.

Anisotropic microporous syndiotactic polystyrene membranes and a process

A process for the preparation of a membrane comprising bisphenol-based polycabonate wherein at least 25 percent by weight of the bisphenol moieties are tetrahalogenated wherein the halogen is Cl or Br, and the membrane prepared by such process. The process generally comprises: forming a mixture comprising (i) a bisphenol-based polycarbonate wherein at least 25 percent by weight of the bisphenol moieties are tetrahalogeneated, wherein the halogen is Cl or Br, and (ii) a solvent for such polycarbonate, wherein the mixture has a sufficient viscosity to allow extrusion at temperatures at which the mixture is homogeneous; heating the mixture to a temperature at which the mixture is a homogeneous fluid and extrudable, extruding the heated mixture into a shape suitable for membrane use; passing the formed membrane through a quench zone wherein the mixture undergoes phase separation, and the major portion of the solvent is removed from the formed membrane; wherein the membrane formed is a membrane with a discriminating region capable of separating oxygen from nitrogen. Such membranes have excellent mechanical and thermal properties.

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Antioch, CA, United States of America

Hawk S Wan