Dow Global Technolgoies LLC

The Dow Chemical Company

Rohm and Haas Electronic Materials Cmp Holdings, Inc.

Paul Aaron Gillis

Harpreet Singh

Helge Braun

Jan Willem Verwijs

Kristina Platkowski

Harald Velten

Joerg Schmidt

Michael K Poindexter

Hua Bai

Cole A Witham

Bedri Erdem

Andrei S Merenov

Zubin B Kuvadia

Daniel J Reed

Abu Mokhtarul Hassan

Joydeep Mukherjee

Naoko Akiya

Jason S Moore

Gerard I Jansma

Timothy Charles Frank

Quan Yuan

Robert P Shirtum

Dennis Wade Jewell

Thomas J Parsons

Pramod D Patil

Biplab Mukherjee

David L Trent

Kenneth W Skaggs

Carol E Mohler

Wu Chen

Paul A Larsen

Fermin Alejandro Sandoval

Joerg-Peter Gehrke

Irfan Khan

Domonique Downing

Ashley W Breed

Cheryl A Tirtowidjojo

J Weldon Moore, Jr

Jorge H Pazmino

Ken W Skaggs

Dennis W Jewell

Artur Klinger

Defne Kayrak Talay

John B Cooper

Arthur C Flores

Thomas L Sanders, Jr

Robert M Whittingslow

Stephanie L Hughes

Sanjib Kumar Das Sharma

Jorg-Peter Gehrke

Vince Farozic

Thomas L Sanders

Abu M Hassan

Mohan V Punganur

Joseph B Elliott

Jia Xie

Ashley Breed

JW Moore

Phosgene is mixed with an organic polyamine to produce polyisocyanate compounds. A phosgene flow is established in a conduit (), and the organic polyamine is injected into the phosgene flow. A constricted region () of the conduit () resides downstream of the point of the polyamine injection. The presence of the constricted region () reduces by-product formation.

Static mixing device and method for mixing phosgene and an organic amine

A process for preparing an isocyanate product includes providing a phosgene inlet stream and an amine in solvent inlet stream to a phosgenation mixer, the amine in-solvent inlet stream including one or more amines and one or more inert solvents, and during steady state operation compensating for a fouling pressure drop increase by decreasing a pressure drop in the phosgenation mixer over a time period divided into at least a first period of time Tand a second period of time Tthat is subsequent to the first period of time T. During the second period of time Tan amine concentration of the one or more amines in the amine-in-solvent stream is higher than during the first period of time T, and during the second period of time Ta phosgene-to-amine ratio value in the phosgenation mixer is higher than during the first period of time T

Process for preparing isocyanates

The present invention relates to a method of dewatering an aqueous mineral suspension comprising introducing into the suspension a flocculating system comprising a mixture of polyethylene oxide polymers, in particular a mixture of one or more high molecular weight polyethylene oxide polymer and one or more ultra high molecular weight polyethylene oxide polymer. Said mixture of polyethylene oxide polymers is useful for the treatment of suspensions of particulate material, especially waste mineral slurries. The invention is particularly suitable for the treatment of tailings and other waste material resulting from mineral processing, in particular, the processing of oil sands tailings.

Method of treating high-solids mineral slurries with polymeric flocculants

The present invention relates to a method of dewatering an aqueous mineral suspension comprising introducing into the suspension a flocculating system comprising a mixture of polyethylene glycol and polyethylene oxide polymers, in particular a mixture of one or more low molecular mass polyethylene glycol with one or more high molecular mass polyethylene oxide. Said mixture of polyethylene glycol and polyethylene oxide polymers is useful for the treatment of suspensions of particulate material, especially waste mineral slurries. The invention is particularly suitable for the treatment of tailings and other waste material resulting from mineral processing, in particular, the processing of oil sands tailings.

Flocculation of high-solids mineral slurries

The present invention relates to an in situ staged steam extraction method for removing petroleum products from a heavy oil or bitumen reservoir from subterranean locations. Specifically, each injection stage comprises a different steam composition. A steam composition may consist essentially of steam or may comprise one or more enhanced oil recovery agent.

Staged steam extraction of in situ bitumen

Embodiments of the present invention relate to a mixing apparatus. Particularly, embodiments of the present invention provide a mixing apparatus for mixing fluid components such as phosgene and amine during a highly reactive chemical reaction. One embodiment provides a mixing conduit comprising a cylindrical sidewall defining an inner volume, wherein one or more jets are formed through the cylindrical sidewalls and connect to the inner volume and one or more flow obstructions disposed in the inner volume, wherein each flow obstruction is positioned upstream from an associated aperture.

Reactive flow static mixer with cross-flow obstructions

Disclosed are processes and apparatuses for producing a crystalline product. The processes and apparatuses may extend the operational time of an evaporative crystallizer by providing an internal volume or large deposit inventory for fouling deposits to reside without impacting the unit operation.

Process and apparatus for forced circulation evaporative crystallization with large deposit inventory

A process includes: (a) injecting a steam composition into a subterranean location containing bitumen, the steam composition containing an alkylene glycol ether and steam, wherein the alkylene glycol ether is other than a glycol ether amine; and (b) recovering bitumen from the subterranean location to above the ground.

Enhanced steam extraction of in situ bitumen

This disclosure relates to a static mixer () with a plurality of nozzles, and more generally, to a mixer and method of use thereof for mixing phosgene and amine with shaped jets or at least two rows of nozzles () where the second row () is used to enrich an area of deficit of the phosgene flow within the static reactive jet mixer (). Configurations of enriching secondary flow include the use of concentric, eccentric, or offset jets of amine/phosgene, and the use of nozzles with different and irregular geometries to help focus amine/phosgene to a specific area of the principal phosgene flow.

Static reactive jet mixer, and methods of mixing during an amine-phosgene mixing process

The present invention a process and apparatus for the production of methylene diphenyl diisocyanate (MDI) isomer mixtures with a low 2,2'-MDI isomer content and a high 2,4&#x2032;-MDI isomer content. The resulting mixtures have an increased reactivity and are acceptable in food grade application due to the reduction in primary aromatic amines formed during the curing process. The process and apparatus also include controlling the amount of 4,4&#x2032;-MDI, which is the most reactive isomer in the mixture allowing use in a wide variety of applications.

Process for the production of methylene diphenyl diisocyanate isomer mixtures with specific isomer distributions and new products derived

The present invention includes a process and apparatus for the production of methylene diphenyl diisocyanate (MDI) isomer mixtures with a low 2,2'-MDI isomer content and a high 2,4&#x2032;-MDI isomer content. The resulting mixtures have an increased reactivity and are acceptable in food grade application due to the reduction in primary aromatic amines formed during the curing process. The process and apparatus also include controlling the amount of 4,4&#x2032;-MDI, which is the most reactive isomer in the mixture allowing use in a wide variety of applications.

Process for the production of methylene diphenyl diisocyanate isomer mixtures with high 2,4'-methylene diphenyl diisocyanate purity

The instant invention is a device for producing dispersions. The device for producing dispersions includes a first stator, a second stator, a shell encasing the first stator and the second stator, a rotor being disposed therebetween the first stator and the second stator thereby forming a first chamber and a second chamber, at least one first inlet port into the first chamber, and at least one outlet port out of the second chamber. The device may optionally include at least one additional second inlet port into the second chamber.

Device for producing dispersions and method of producing dispersions

The instant invention is a device for producing dispersions and method of producing dispersions. The device for producing dispersions includes a first stator, a second stator, a shell encasing the first stator and the second stator, a rotor being disposed therebetween the first stator and the second stator thereby forming a first chamber and a second chamber, at least one first inlet port into the first chamber, and at least one outlet port out of the second chamber. The device may optionally include at least one additional second inlet port into the second chamber. The method of producing a polyurethane dispersion includes the following steps: (1) providing a device for producing a dispersion including a first stator, a second stator, a shell encasing the first stator and the second stator, a rotor being disposed therebetween the first stator and the second stator thereby forming a first chamber and a second chamber, at least one first inlet port into the first chamber, at least one outlet port out of the second chamber; and optionally one or more additional second inlet ports into the second chamber; (2) introducing a prepolymer phase and an aqueous phase into the first chamber via the first inlet ports; (3) emulsifying the prepolymer phase in the aqueous phase; (4) thereby producing a prepolymer emulsion; (5) introducing a chain extender agent into the emulsion in the second chamber via the second inlet port; (6) chain extending the prepolymer; and (7) thereby producing a polyurethane dispersion.

An apparatus and a method for mixing at least two fluid substances and carrying out or initiating a reaction between them, wherein the apparatus is a static mixer are described. The static mixer includes a fluid receiving chamber, a first conduit passing through the fluid receiving chamber and having at least one tapered aperture therethrough, and a second conduit operatively connected to the fluid receiving chamber.

Tapered aperture multi-tee mixer

A tubular reactor characterized by having short static mixing elements separated by coalescing zones is used to conduct multiphase liquid/liquid reactions. Small droplets of one of the phases are dispersed into the other phase by the static mixing elements. These droplets coalesce and at least partially phase separate as the mixture passes through the subsequent coalescing zone. The tubular reactor is particularly suitable for nitrating organic compounds while forming low levels of improperly nitrated by-products and low levels of nitrophenolics.

Tubular reactor having static mixing elements separated by coalescing zones

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Lake Jackson, TX, United States of America

Paul Aaron Gillis