Union Carbide Corporation

Lyondell Chemical Worldwide, Inc.

Robert W Beisner

Andrew M Thompson

Chiu Y Chan

Mark R Kinkelaar

Jack R Reese, Ii

Stephen C Winans

Thomas P Farrell

Donald F Rohr

Wolfgang Schmidt

Danny J Frich

George Ernest Keller, Ii

Wellington E Walker

Charles E Moyer, Jr

Copolymer DMC-catalyzed polyoxypropylene polyols which exhibit processing latitude similar to base-catalyzed copolymer analogs and base-catalyzed homopolyoxypropylene analogs may be prepared by oxyalkylation with a mixture of propylene oxide and ethylene oxide such that a finite ethylene oxide content is maintained in the oxyalkylation reactor for the most substantial part of the oxyalkylation, the polyoxypropylene polyol having randomly distributed oxyethylene moieties which constitute 1.5 weight percent or more of the polyol product.

Molded and slab polyurethane foam prepared from double metal cyanide

Copolymer DMC-catalyzed polyoxypropylene polyols which exhibit processing latitude similar to base-catalyzed copolymer analogs and homopolyoxypropylene analogs may be prepared by oxyalkylation with a mixture of propylene oxide and ethylene oxide such that a finite ethylene oxide content is maintained in the oxyalkylation reactor for the most substantial part of the oxyalkylation, the polyoxypropylene polyol having randomly distributed oxyethylene moieties which constitute 1.5 weight percent or more of the polyol product. Block copolymer polyols having external blocks containing lesser oxyethylene content than internal blocks and bicompositional compositions containing discrete multimodal and dissimilar and optionally multimodal polyols produced by a continuous addition of starter process are useful as polyols exhibiting greater processing latitude.

This invention relates to the continuous production of alkane polyols by the reaction of hydrogen and CO in a homogeneous liquid phase mixture containing a rhodium carbonyl complex catalyst, the mole ratio of H.sub.2 /CO in the reactant gas being above about 0.1, wherein the improvement comprises periodically lowering the H.sub.2 /CO mole ratio in the reactant gas to about 0.1 or less and thereafter increasing the H.sub.2 /CO mole ratio to about its former value.

Rhodium catalyst regeneration by carbon monoxide treatment

This invention relates to the continuous production of alkane polyols by the reaction of hydrogen and oxides of carbon in a homogeneous liquid phase mixture containing a rhodium carbonyl complex catalyst wherein the improvement comprises periodically lowering the temperature of the liquid phase mixture and thereafter raising it to about its former value.

Rhodium catalyst regeneration by thermal treatment

The process involves the separation of product from a liquid homogeneous mixture obtained from the reaction of oxides of carbon (e.g. CO) and H.sub.2 in a solvent solution containing a rhodium carbonyl complex catalyst. The solution stability of the catalyst is enhanced by volatilizing the product from the mixture while simultaneously maintaining the mixture in contact with CO gas.

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Charleston, WV, United States of America

Robert W Beisner