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US 6,166,170 AGranted
Esterification catalysts and processes therefor and therewith
AssigneeE. I. Du Pont de Nemours and Company
InventorDonald Edward Putzig
Life of this patent
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AssigneeE. I. Du Pont de Nemours and Company
InventorDonald Edward Putzig
Estimating the term…
A catalyst composition is disclosed. The composition comprises a titanium compound, a complexing agent, hypophosphorous acid or its metal salt, water and optionally a solvent. The complexing agent can be hydroxycarboxylic acid, alkanolamines, aminocarboxylic acids, or combinations of two or more thereof. The solvent can be water, ethanol, propanol, isopropanol, butanol, ethylene glycol, propylene glycol, isopropylene glycol, butylene glycol, 1-methyl propylene glycol, pentylene glycol, or combinations of two or more thereof. The titanium compound can be combined with a zirconium compound. Also disclosed is a process for using the composition for producing an ester or a polyester. The process comprises contacting a carbonyl compound, in the presence of the composition, with an alcohol under a condition suitable for esterification, transesterification, polymerization, or combinations of two or more thereof.
A composition comprising a titanium compound, a complexing agent, and an aqueous solution of hypophosphorous acid or a salt thereof wherein said complexing agent is selected from the group consisting of hydroxycarboxylic acids, alkanolamines, aminocarboxylic acids, and combinations of two or more thereof.
A composition comprising a titanium compound, a complexing agent, and hypophosphorous acid or a salt thereof, and a solvent wherein
A composition comprising a titanium compound, a complexing agent, and hypophosphorous acid or a salt thereof, and a solvent wherein
A composition comprising a titanium complex and hypophosphorous acid or its salt wherein said titanium complex is a complex of a titanium compound and a complexing agent wherein said titanium compound has the formula Ti(OR).sub.4, each R is independently selected from the group consisting of an alkyl radical, a cycloalkyl radical, aralkyl radical, and combinations of two or more thereof and contains from 1 to about 30 carbon atoms per radical;
A process comprising contacting, in the presence of a catalyst composition, a carbonyl compound and an alcohol wherein said catalyst comprises a titanium compound, a complexing agent, and hypophosphorous acid or its salt wherein said complexing agent is selected from the group consisting of hydroxycarboxylic acids, alkanolamines, aminocarboxylic acids, and combinations of two or more thereof.
Dependencies are inferred from the claim text.