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Process for the generation of .alpha., .beta.-unsaturated carboxylic acids and esters using niobium catalyst

Patent ·
OSTI ID:872735
 [1];  [2];  [3]
  1. Durham, NC
  2. Cary, NC
  3. Kingsport, TN
+ Show Author Affiliations
A process using a niobium catalyst includes the step of reacting an ester or carboxylic acid with oxygen and an alcohol in the presence a niobium catalyst to respectively produce an .alpha.,.beta.-unsaturated ester or carboxylic acid. Methanol may be used as the alcohol, and the ester or carboxylic acid may be passed over the niobium catalyst in a vapor stream containing oxygen and methanol. Alternatively, the process using a niobium catalyst may involve the step of reacting an ester and oxygen in the presence the niobium catalyst to produce an .alpha.,.beta.-unsaturated carboxylic acid. In this case the ester may be a methyl ester. In either case, niobium oxide may be used as the niobium catalyst with the niobium oxide being present on a support. The support may be an oxide selected from the group consisting of silicon oxide, aluminum oxide, titanium oxide and mixtures thereof. The catalyst may be formed by reacting niobium fluoride with the oxide serving as the support. The niobium catalyst may contain elemental niobium within the range of 1 wt % to 70 wt %, and more preferably within the range of 10 wt % to 30 wt %. The process may be operated at a temperature from 150 to 450.degree. C. and preferably from 250 to 350.degree. C. The process may be operated at a pressure from 0.1 to 15 atm. absolute and preferably from 0.5-5 atm. absolute. The flow rate of reactants may be from 10 to 10,000 L/kg.sub.(cat) /h, and preferably from 100 to 1,000 L/kg.sub.(cat) /h.
Research Organization:
RESEARCH TRIANGLE INSTITUTE
DOE Contract Number:
AC22-94PC94065
Assignee:
Eastman Chemical Company (Kingsport, TN)
Patent Number(s):
US 5998657
OSTI ID:
872735
Country of Publication:
United States
Language:
English

References (11)

Reaction of acetic acid with methanol over vanadium-titanium binary phosphate catalysts in the presence of oxygen journal March 1990
Vapor-phase aldol condensation of formaldehyde with acetic acid on V2O5$z.sbnd;P2O5 catalysts journal September 1987
The Effects of the Reaction Variables on the Yields of Acrylic Acid and Methyl Acrylate in the Reaction of Acetic Acid with Methanol in the Presence of Oxygen journal January 1990
Vapor-Phase Aldol Condensation of Formaldehyde with Propionic Acid on Vanadium Pentoxide—Phosphorus Pentoxide journal January 1988
Coupling Reaction Between Methylpropionate and Methanol to form Methylmethacrylate over Metal Ion-Contained Magnesium Oxide Catalysts journal June 1985
Reaction of propionic acid with methylal over vanadium-silicon-phosphorus oxide journal January 1990
The production of methacrylic acid by the vapor-phase aldol condensation of propionic acid with formaldehyde journal July 1990
The Production of Methacrylic Acid by the Vapor-Phase Aldol Condensation over V–Si–P Ternary Oxide Catalyst journal April 1990
Reaction of Methyl Propionate with Methylal over V–Si–P Ternary Oxide Catalysts journal December 1990
Preparation of high-surface-area titanium-vanadium binary pyrophosphate catalysts journal March 1989
Effect of the composition of vanadium-titanium binary phosphate on catalytic performance in vapor-phase aldol condensation journal September 1989

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