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US 5,471,003 AGranted
Purification of cyclopropanecarboxaldehyde
AssigneeEastman Chemical Company
InventorShaowo Liang
Life of this patent
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Abstract
Disclosed is a process for the removal of crotonaldehyde impurity from cyclopropanecarboxaldehyde by the selective, catalytic hydrogenation of crotonaldehyde to butyraldehyde followed by distillation of the butyraldehyde from the cyclopropanecarboxaldehyde.
Claims4
Process for the purification of cyclopropanecarboxaldehyde contaminated with crotonaldehyde comprising the steps of:
- (1) contacting a mixture comprising cyclopropanecarboxaldehyde and crotonaldehyde with hydrogen in the presence of a palladium, platinum or rhodium catalyst under hydrogenation conditions of temperature and pressure;
- and
- (2) subjecting the hydrogenated mixture from step (1) to distillation to remove butyraldehyde therefrom to obtain cyclopropanecarboxaldehyde substantially free of crotonaldehyde.
Process for the purification of cyclopropanecarboxaldehyde contaminated with crotonaldehyde comprising the steps of:
- (1) contacting a mixture comprising cyclopropanecarboxaldehyde and crotonaldehyde in a crotonaldehyde:cyclopropanecarboxaldehyde weight ratio of about 1:99 to 10:90 with hydrogen in the presence of a palladium catalyst at a temperature of about 10.degree. to 40.degree. C. and a pressure of about 1.4 to 10 bar absolute;
- and
- (2) subjecting the hydrogenated mixture from step (1) to distillation to remove butyraldehyde therefrom to obtain cyclopropanecarboxaldehyde substantially free of crotonaldehyde.
Dependencies are inferred from the claim text.