Dow Global Technolgoies LLC

Dow Portugal Produtos Quimicos, Sociedade Unipessoal, Lda

Dow, Portugal Produtos Quimicos, Sociedade Unipessoal

Helge Braun

Robert E Hefner, Jr

Paul Aaron Gillis

Brian L Cramm

Jan Willem Verwijs

Kristina Platkowski

Joerg Schmidt

Armenio Costa

Harald Velten

William J Harris

Felipe A Donate

Kaoru Aou

Daniel Lawrence Dermody

Qinghao Meng

Adam L Grzesiak

Christopher Thiede

Meagan Broadway

Yin Tang

Van M Delk, Jr

Jr Robert E Hefner

Chrisopher P Thiede

Organic isocyanates are converted to ureas by heating in the presence of certain cobalt, magnesium, chromium and lanthanide series organometallic catalysts. The process requires no water or other reactants. The process is particularly useful for removing small quantities of monoisocyanates from a solvent stream recovered from a polyisocyanate manufacturing process. The urea compounds in some instances can be recycled back into the polyisocyanate manufacturing process and reacted with polyisocyanate compounds to form biurets.

Method for converting monoisocyanates to ureas

Monoisocyanate impurities are removed from a process stream obtained when solvent is separated from a polyisocyanate product. The monoisocyanates are reacted with amine compounds at specific molar ratios to produce ureas. The ureas can be discarded by burning, landfilling or otherwise. Alternatively the ureas can be recycled back into the polyisocyanate manufacturing process, where they are formed into biuret compounds that can remain with the polyisocyanate product.

Method for removing monoisocyanates from organic solution

Phenyl isocyanates are removed from a solvent stream obtained from an MDI and/or PMDI manufacturing process by reaction in the presence of a carbodiimidization catalyst to form the corresponding N,N-diphenylcarbodiimides. The N,N-diphenylcarbodiimides can be recycled into the MDI and/or PMDI manufacturing process where they can react with MDI and/or PMDI to form uretonimines. The uretonimines have at most minimal effect on the properties and usefulness of the MDI and/or PMDI product and so can be left in the MDI and/or PMDI product.

Phenyl isocyanate conversion process

Recovery times and/or airflow of flexible polyurethane foam is increased by including certain tackifiers in the foam formulation. The tackifiers are characterized in being incompatible with polyol or polyol mixture used to make the foam, having a viscosity of at least 5,000 centipoise at 25 #C and having a glass transition temperature of at most 20 #C. The tackifier is pre-blended with certain monols to form a lower-viscosity blend that is combined with one or more other polyols and a polyisocyanate to form a reaction mixture for producing a polyurethane foam.

Flexible polyurethane foam having prolonged recovery time

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

Process for conducting liquid/liquid multiphase reactions in a tubular reactor having static mixing elements separated by coalescing zones

Process for ring nitrating aromatic compounds in a tubular reactor having static mixing elements separated by coalescing zones

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Helge Braun