Celanese Gmbh

Hoechst Celanese Corporation

Adin L Stautzenberger

James L Paul

Jerry D Unruh

William J Wells, Iii

Edward E Quick

Frank Stevens Wagner

Peter F Lobo

Polyarylates formed by reacting the diester of a dihydric phenol such as bisphenol-A and at least one aromatic dicarboxylic acid in the presence of an esterification catalyst is provided with improved color by the addition of cobalt during polymerization. The amount of cobalt can be reduced and an additional amount of an ultramarine blue pigment can be added to the reaction mixture to maintain the color improvement.

Process for preparing low color polyarylates

Color properties of crude phenolic esters of aromatic dicarboxylic acids are improved by comminuting the ester to a finely divided particle size in the presence of an aqueous or alcoholic alkali solution and thereafter distilling the esters to obtain phenolic esters of reduced color.

Purification of diphenyl phthalates

Olefins are converted to aldehydes and/or alcohols having one more carbon atom than the olefin by reacting the olefin with carbon monoxide and hydrogen in the presence of an in situ formed catalytic complex of a Group VIII metal, carbon monoxide and a trivalent ligand, the metal being introduced into the reaction zone in the form of a solution of a water-soluble inorganic salt dissolved in a solvent comprised of at least 40% by volume of a polyalkylene glycol, the polyalkylene glycol acting as a coupling agent preventing precipitation of the metal prior to formation of the catalyst complex.

Hydroformylation of olefins

In a process for the manufacture of trioxane by the distillation of aqueous formaldehyde solutions which are intimately mixed with an immiscible, non-volatile, oily liquid phase, the improvement comprising using a monoalkyl ether of a polyoxyalkylene glycol as the oily phase.

Trioxane production

Pest repellency afforded by the presence of an effective amount of 2,7-dioxo (or dithio) decahydropyrimido-[4,5-d]-pyrimidines; compositions and treatments therewith; and pest repellent structures.

Substituted pyrimido-[4,5-d]-pyrimidine compounds useful for repelling

The purity, and thus suitability of triorganophosphorus ligands of the same chemical composition obtained from different sources for use in forming catalytic complexes for catalyzing hydroformylation reactions is determined by heating an admixture of the organophosphorus ligand and an aldehyde, measuring the amount of resultant condensation products, and comparing said amount to a standard.

Method for determining suitability of triorganophosphorus ligands for

A process for the epoxidation of ethylenically unsaturated compounds with organic hydroperoxides using metal-free phthalocyanines or metal phthalocyanines as catalysts. Suitable metals include those of the metals Ni, Cu, Ag, Ti, V, Zr, Mo. Re, or U.

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Corpus Christi, TX, United States of America

Adin L Stautzenberger