Patent ID: 8692028
Filing Date: 2014-04-08
Classification: C07C

Abstract:
1. A method of hydrogenating a carbon-carbon double bond conjugated with a carbonyl carbon in an 1,2-unsaturated carbonylic compound in gas phase, comprising the step of: passing a gaseous stream comprising said 1,2-unsaturated carbonylic compound to be hydrogenated and hydrogen over a palladium catalyst comprising a carrier and palladium, wherein said catalyst has a heterogeneous distribution of palladium, palladium being concentrated to the outermost surface of the catalyst, which outermost surface is being exposed to the surrounding; wherein the temperature over said catalyst is 120 to 200° C. and the pressure over said catalyst is at least 0.1 MPa; and said 1,2-unsaturated carbonylic compound is an aldehyde according to structural formula (II), wherein R