Olefin hydrogenation method

This invention relates to a method of further treatment of a process stream obtained by hydrotreating a feedstream containing at least one C5 plus paraffinic hydrocarbon and at least one olefinic hydrocarbon having the same number of carbon atoms. The stream from the hydrotreating zone is passed to a stripping column 6 to remove light ends 7. A liquid retention volume is provided at the base of column 6 and substantially all the liquid from a level 8, just above the liquid retention volume is passed to reactor 19 where it is subjected to further catalytic hydrogenation. The effluent from reactor 19 is recycled to the liquid retention volume. from which a bottoms stream is removed through line 10. The bottoms stream, having a greatly reduced content of olefinic hydrocarbon, is suitable for separaton into its components in absorptive separation zone 13 containing a shape-specific olefin-sensitive absorbent. The method is particularly suitable for separating n-paraffins from i-paraffins in hydrocarbons boiling in the naphtha and kerosene ranges.