Process for preparing modified V-Ti-P catalysts for synthesis of 2,3-unsaturated carboxylic acids
AssigneeEastman Chemical Company
InventorsDavid William Norman, Greg Alan King
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Abstract
The invention relates to a catalyst composition comprising a mixed oxide of vanadium, titanium, and phosphorus modified with alkali metal. The titanium component is derived from a water-soluble, redox-active organo-titanium compound. The catalyst composition is highly effective at facilitating the vapor-phase condensation of formaldehyde with acetic acid to generate acrylic acid, particularly using an industrially relevant aqueous liquid feed.
Claims27
A catalyst composition comprising an amorphous mixed oxide of vanadium (V), titanium (Ti), phosphorus (P), and alkali metal (M), having the general formula VTiaPbMcOd,wherein a is a number from 0.3 to 6.0 , b is a number from 2.0 to 13.0, c is a number from 0.01 to 1.25, and d is the number of atoms required to satisfy the valences of V, Ti, P, and M, wherein the titanium component is the residue of a water-soluble, redox-active organo-titanium compound, wherein the organic titanium compound is titanium (IV) bis(ammonium lactate) dihydroxide.
A method for preparing an amorphous catalyst composition comprising a mixed oxide of vanadium (V), titanium (Ti), phosphorus (P), and alkali metal (M) having the general formula VTiaPbMcOd, wherein a is a number from 0.3 to 6.0, b is a number from 2.0 to 13.0, c is a number from 0.01 to 1.25, and d is the number of atoms required to satisfy the valences of V, Ti, P, and M, the titanium component is a residue of a water-soluble, redox-active organo-titanium compound of titanium (IV) bis(ammonium lactate) dihydroxide;
- wherein the method comprises:
- (a) providing an aqueous solution comprising a water-soluble, redox-active organo-titanium compound of titanium (IV) bis(ammonium lactate) dihydroxide;
- (b) adding a vanadium compound, a phosphorus compound, and an alkali metal compound to the aqueous titanium solution to form a mixture of catalyst components;
- (c) heat-treating the mixture;
- (d) removing water from the heat-treated mixture to obtain a solid residue comprising the catalyst components;
- and
- (e) calcining the solid residue at an elevated temperature in the presence of air to obtain the catalyst composition.
A process for preparing 2,3-unsaturated carboxylic acid, comprising:
- contacting a formaldehyde source with a carboxylic acid in the presence of a condensation catalyst under vapor-phase condensation conditions to obtain the 2,3-unsaturated carboxylic acid,
- wherein the condensation catalyst comprises an amorphous mixed oxide of vanadium (V), titanium (Ti), phosphorus (P), and alkali metal (M), having the general formula VTiaPbMcOd, wherein a is a number from 0.3 to 6.0, b is a number from 2.0 to 13.0, c is a number from 0.01 to 1.25, and d is the number of atoms required to satisfy the valences of V, Ti, P, and M, and
- wherein the titanium component is the residue of a water-soluble, redox-active organo-titanium compound of titanium (IV) bis(ammonium lactate) dihydroxide.
Dependencies are inferred from the claim text.