Process for the conversion of 2,3-dihydrofuran to cyclopropanecarboxaldehyde
AssigneeEastman Chemical Company
InventorsShaowo Liang, Timothy W. Price
Life of this patent
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Abstract
Disclosed is a process for the preparation of cyclopropanecarboxaldehyde by the isomerization of 2,3-dihydrofuran wherein 2,3-dihydrofuran is contacted with a catalyst selected from alumina, silica-alumina, silica, zirconia, titania and mixtures thereof having a nitrogen BET surface area of about 10 to 350 square meters per gram at elevated temperature.
Claims7
Process for the preparation of cyclopropanecarbox-aldehyde which comprises heating 2,3-dihydrofuran at a temperature of about 180.degree. C. to 430.degree. C. in the presence of a catalyst selected from alumina, silica-alumina, silica, zirconia, titania and mixtures thereof, wherein the nitrogen BET surface area of the catalyst is in the range of about 10 to 350 square meters per gram and from about 3 to 30 mole percent of the 2,3-DHF is converted to CPCA per pass over the catalyst.
Continuous process for the preparation of cyclo- propanecarboxaldehyde which comprises the steps of:
- (1) continuously feeding a gaseous mixture comprising 2,3-DHF and an inert diluent in a 2,3-DHF:inert diluent volume ratio of about 1:0.01 to 1:10 to a reaction zone maintained at a temperature of about 200.degree. C. to 300.degree. C. and a pressure of about 4.5 to 35.5 bars absolute which reaction zone contains a catalyst selected from alumina, silica-alumina, silica, zirconia, titania and mixtures thereof having a nitrogen BET surface area of about 30 to 300 square meters per gram;
- and
- (2) continuously removing a gaseous isomerization product comprising cyclopropanecarboxaldehyde from the reaction zone;
- whereby about 5 to 30 mole percent of the 2,3-DHF is converted to CPCA per pass over the catalyst.
Dependencies are inferred from the claim text.