Abstract: The invention relates to a process for removing dienes from a material stream comprising C3 to C5 hydrocarbons by selective hydrogenation at a specified reaction pressure and a specified reaction temperature in the presence of a hydrogenation catalyst, wherein the reaction pressure and the reaction temperature at the reactor inlet are regulated such that the reaction pressure at the reactor inlet does not deviate by more than 0.01 bar from the specified reaction pressure and the reaction temperature at the reactor inlet does not deviate by more than 0.1° C. from the specified reaction temperature and the proportion of hydrogen supplied to the selective hydrogenation is in the range from 2 to 20 moles per mole of diene present in the material stream comprising C3 to C5 hydrocarbons.

Abstract: The invention relates to a process for removing dienes from a material stream comprising C3 to C5 hydrocarbons by selective hydrogenation at a specified reaction pressure and a specified reaction temperature in the presence of a hydrogenation catalyst, wherein the reaction pressure and the reaction temperature at the reactor inlet are regulated such that the reaction pressure at the reactor inlet does not deviate by more than 0.01 bar from the specified reaction pressure and the reaction temperature at the reactor inlet does not deviate by more than 0.1° C. from the specified reaction temperature and the proportion of hydrogen supplied to the selective hydrogenation is in the range from 2 to 20 moles per mole of diene present in the material stream comprising C3 to C5 hydrocarbons.

Abstract: Process for the preparation of alpha, beta unsaturated aldehydes by oxidation of alcohols in the presence of a liquid phase wherein the liquid phase contains 0.1 to less than 25 weight-% water and wherein the liquid phase contains at least 25 weight-% of alcohol(s) of general formula (II) and alpha, beta unsaturated aldehyde(s) of general formula (I) and wherein the oxidant is oxygen and/or hydrogen peroxide.

Abstract: The present invention provides a catalyst comprising alumina as carrier material and palladium or platinum as active component, obtainable by a) impregnating an alumina carrier with a solution comprising at least one salt of the active component palladium or platinum, b) drying the catalyst thus obtained, c) treating the catalyst thus obtained with hydrogen, or a mixture of hydrogen and at least one inert gas, for a period of 1 to 24 hours at a temperature of 30 to 200° C., and d) thereafter keeping the catalyst thus reduced in the presence of hydrogen, or a mixture of hydrogen and at least one inert gas, for a period of 1 hour to 10 days at a temperature of 10 to 100° C. The catalyst provided by the invention is useful in processes for isomerization of olefins from olefin-containing hydrocarbonaceous mixtures having 4 to 20 carbon atoms at temperatures of 10 to 150° C. and pressures of 1 to 35 bar.