Patent ID: 6365790
Filing Date: 2002-04-02
Classification: B01J,C07C

Abstract:
A process for the preparation of alkenes by partial hydrogenation of alkynes in the liquid phase at from 20 to 250Â° C. and hydrogen partial pressures of from 0.3 to 200 bar over fixed-bed supported palladium catalysts which are obtainable by heating the support material in the air, cooling, applying a palladium compound and, optionally, other metal ions for doping purposes, molding and processing to give monolithic catalyst elements, whereinA) alkynes of 10 to 30 carbon atoms are used as starting compounds, B) the palladium compound and, optionally, the other metal ions are applied to the support material by impregnation of the heated and cooled support material with a solution containing palladium salts and, if required, other metal ions and subsequent drying, and C) from 10 to 2000 ppm of carbon monoxide (CO) are added to the hydrogenation gas or a corresponding amount of CO is allowed to form in the liquid phase by slight decomposition of a compound which is added to the reaction mixture and eliminates CO under the reaction conditions.