Method for removing dienes from a material stream containing C3 to C5 hydrocarbons by selective hydrogenation

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 by feeding the material stream via a reactor inlet into a reactor and contacting the material stream with the hydrogenation catalyst in the reactor to produce a product stream comprising a reduced amount of dienes, 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 a range from 2 to 20 moles per mole of diene present in the material stream comprising C3 to C5 hydrocarbons, wherein for regulating the pressure and the temperature at the reactor inlet, the process comprises:

• (a) obtaining a partially vaporized material stream comprising C3 to C5 hydrocarbons by one of:
• (i) vaporizing a part of a material stream comprising liquid C3 to C5 hydrocarbons,
• (ii) mixing a gaseous material stream comprising C3 to C5 hydrocarbons and a liquid material stream comprising C3 to C5 hydrocarbons, or
• (iii) condensing a part of a material stream comprising gaseous C3 to C5 hydrocarbons,
• wherein 2 to 50 mol % of the partially vaporized material stream comprising C3 to C5 hydrocarbons is present in the gas phase,
• (b) supplying the partially vaporized material stream comprising C3 to C5 hydrocarbons to the reactor comprising the hydrogenation catalyst and adding hydrogen in a proportion of 2 to 20 moles per mole of diene present in the material stream comprising C3 to C5 hydrocarbons to obtain a hydrogenated partially vaporized material stream comprising C3 to C5 hydrocarbons, wherein the hydrogenated partially vaporized material stream contains a reduced amount of dienes, relative to the partially vaporized material stream, wherein the hydrogen is added together with the partially vaporized material stream comprising C3 to C5 hydrocarbons or via a separate addition point,
• (c) separating the hydrogenated partially vaporized material stream into a gas phase stream and a liquid phase stream and withdrawing the liquid phase stream as a product stream.