Dow Global Technolgoies LLC

The Dow Chemical Company

Janet M Goss

Junqiang Liu

George L Athens

Edward M Calverley

Patrick T McGough

Wei Wang

Jonathan D Lunn

Douglas E Beyer

Chan Han

Robin Paul Ziebarth

Richard A Patyk

Aleksander Jozef Pyzik

George J Frycek

Rongjuan Cong

Daniel P Sophiea

Arthur Richard Prunier, Jr

Liren Xu

Sharon Allen

Craig F Gorin

Nicholas M Shinkel

Kwanho Yang

Raymond M Collins

Sanjay C Solanki

Stephanie K Anderson

Troy D Wolford

Kristina Platkowski

Charles Michael Cheatham

Albert Parrott

Wen-hong Tong

William R Bauer

Douglas D Merrick

Jeffrey R Montanye

A carbon molecular sieve (CMS) membrane may advantageously be made by pyrolyzing a membrane precursor composition comprised of a carbon forming polymer (e.g., polyimide) blended with a polyvinylidene chloride copolymer (PVDC), the polyvinylidene chloride copolymer being the reaction product of at least 60% to 97% by weight of vinylidene chloride and at least one other comonomer and the carbon forming polymer to polyvinylidene chloride copolymer has a weight ratio of greater than 1 to 99. The membrane precursor composition may be formed by dissolving the carbon forming polymer and PVDC in a solvent to form a dope solution. The dope solution may be shaped, for example, into an asymmetric hollow fiber. The asymmetric hollow fiber may be heated to a temperature to dehydrochorinate the PVDC and then subsequently heated in a non-oxidizing atmosphere to carbonize the polymers of the shaped membrane to form the CMS membrane.

Carbon molecular sieve membrane produced from a carbon forming polymer-polyvinylidene chloride copolymer blend

A process for separating hydrogen from a gas mixture having hydrogen and a larger gas molecule is comprised of flowing the gas mixture through a carbonized polyvinylidene chloride (PVDC) copolymer membrane having a hydrogen permeance in combination with a hydrogen/methane selectivity, wherein the combination of hydrogen permeance and hydrogen/methane selectivity is (i) at least 30 GPU hydrogen permeance and at least 200 hydrogen/methane selectivity or (ii) at least 10 GPU hydrogen permeance and at least 700 hydrogen/methane selectivity. The carbonized PVDC copolymer may be made by heating and restraining a polyvinylidene chloride copolymer film or hollow fiber having a thickness of 1 micrometer to 250 micrometers to a pretreatment temperature of 100° C. to 180° C. to form a pretreated polyvinylidene chloride copolymer film and then heating and restraining the pretreated polyvinylidene chloride copolymer film to a maximum pyrolysis temperature from 350° C. to 750° C.

Separation of gases via carbonized vinylidene chloride copolymer gas separation membranes and processes therefor

A packing material for chromatography, the packing material comprising coated particles, wherein the coated particles comprise non-porous particles and a portion of the surface area of the non-porous particles is coated with a coating composition comprising graphene and/or graphene oxide.

Chromatography of polymers using particles coated with graphene-based compositions

A supported carbon molecular sieve (CMS) membrane is made by contacting a film of a carbon forming polymer on a polymer textile to form a laminate. The laminate is then heated to a temperature for a time under an atmosphere sufficient to carbonize the film and polymer textile to form the supported CMS membrane. The supported CMS membrane formed is a laminate having a carbon separating layer graphitically bonded to a carbon textile, wherein the carbon separating layer is a continuous film. The supported CMS membranes are particularly useful for separating gases such as olefins from their corresponding paraffins.

Supported carbon molecular sieve membranes and method to form them

A process for separating hydrogen from a gas mixture having hydrogen and a larger gas molecule is comprised of flowing the gas mixture through a carbonized polyvinylidene chloride (PVDC) copolymer membrane having a hydrogen permeance in combination with a hydrogen/methane selectivity, wherein the combination of hydrogen permeance and hydrogen/methane selectivity is (i) at least 30 GPU hydrogen permeance and at least 200 hydrogen/methane selectivity or (ii) at least 10 GPU hydrogen permeance and at least 700 hydrogen/methane selectivity. The carbonized PVDC copolymer may be made by heating and restraining a polyvinylidene chloride copolymer film or hollow fiber having a thickness of 1 micrometer to 250 micrometers to a pretreatment temperature of 100&#xb0; C. to 180&#xb0; C. to form a pretreated polyvinylidene chloride copolymer film and then heating and restraining the pretreated polyvinylidene chloride copolymer film to a maximum pyrolysis temperature from 350&#xb0; C. to 750&#xb0; C.

A carbonized PVDC copolymer useful for the separation of an olefin from its corresponding paraffin may be made by heating a polyvinylidene chloride copolymer film or hollow fiber having a thickness of 1 micrometer to 20 micrometers to a pretreatment temperature of 100&#xb0; C. to 180&#xb0; C. to form a pretreated polyvinylidene chloride copolymer film and then heating the pretreated polyvinylidene chloride copolymer film to a maximum pyrolysis temperature from 350&#xb0; C. to 750&#xb0; C. A process for separating an olefin from its corresponding paraffin in a gas mixture is comprised of flowing the gas mixture through the aforementioned carbonized polyvinylidene chloride (PVDC) copolymer to produce a permeate first stream having an increased concentration of the olefin and a second retentate stream having an increased concentration of its corresponding paraffin.

An additive elastomeric manufactured part having improved surface finish is made by repeatedly extruding through a nozzle to build up layers of a material comprised of a prepolymer comprised of an isocyanate terminated prepolymer and a filler in an amount such that the material has a shear storage modulus G' of 100,000 to 300,000 Pa measured at an oscillation rate of 1 Hz and a relaxation time of 20 seconds to 360 seconds. It has been discovered that the particular material having these rheological properties is able to improve the surface finish of the additive manufactured part without slumping and is believed to be due to surface flow of material into valleys between the extrudates as they are being built up.

Method for improving the surface finish of additive manufactured articles

A process to prepare a carbon molecular sieve adsorbent composition comprises steps beginning with an activated carbon having specific effective micropore size. The activated carbon is impregnated with monomers or partially polymerized polymer, allowed to complete polymerization, and then carbonized such that the impregnant shrinks the micropores to another specific effective micropore size. Finally, the impregnated/polymerized/carbonized product is annealed at a temperature ranging from 1000&#xb0; C. to 1500&#xb0; C., which ultimately and predictably shrinks the micropores to a size ranging from 4.0 Angstroms to 4.3 Angstroms. The invention surprisingly enables fine tuning of the effective micropore size, as well as desirable selectivity, capacity and adsorption rates, to obtain highly desirable carbon molecular sieving capability particularly suited for use in, for example, fixed beds in pressure swing or temperature swing processes to enable propylene/propane separations.

Carbon molecular sieve adsorbents prepared from activated carbon and useful for propylene-propane separation

A method for manufacturing filtered high aspect ratio silver nanowires is provided, wherein a total glycol concentration is &#x3c;0.001 wt % at all times.

Hydrothermal method for manufacturing filtered silver nanowires

A process for manufacturing silver nanowires is provided, wherein the recovered silver nanowires have a high aspect ratio; and, wherein the total glycol concentration is &#x3c;0.001 wt % at all times during the process.

Silver nanowire manufacturing method

A method for manufacturing high aspect ratio silver nanowires is provided, wherein a total glycol concentration is &#x3c;0.001 wt % at all times.

Hydrothermal method for manufacturing silver nanowires

Method of manufacturing silver nanowires

Acicular mullite bodies are made in two-step firing process in which a green body is converted first to a fluorotopaz and then to acicular mullite. The bodies are contained within an enclosed region of the furnace. A flow of process gas is provided through the enclosed region during the fluorotopaz-forming step. The process gas is introduced into the enclosed region through multiple openings on at least one side of the enclosed region, and withdrawn through multiple openings on another side of the enclosed region. During the acicular mullite-forming step, a flow of purge gas is maintained in the exterior portion of the furnace. This purge gas may be removed by flowing it into the enclosed region of the furnace and out of the furnace from the enclosed region without re-entering the exterior portion for the furnace.

Method for making porous acicular mullite bodies

An improved ceramic honeycomb structure is comprised of at least two separate smaller ceramic honeycombs that have been adhered together by a cement layer comprised of a cement layer has at least two regions of differing porosity or cement layer where the ratio of toughness/Young's modulus is at least about 0.1 MPa&#xb7;m/GPa.

Cement to make thermal shock resistant ceramic honeycomb structures and method to make them

The invention is a process for making high molecular weight polymers of monoalkenyl arene monomers comprising:

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Saginaw, MI, United States of America

Janet M Goss