Selective hydrogenation process

A process for hydrogenating a diolefin, the process comprising:

• contacting a liquid phase olefin stream containing from 200 ppm to 2 wt. % 1,3-butadiene, based on the total weight of the olefin stream, with a single catalyst and hydrogen in the substantial absence of carbon monoxide, wherein the contacting is conducted:
• (a) such that the hydrogen is fed into the process at least 2 different hydrogen feed points, and the amount of hydrogen fed to at least one feed point is a substoichiometric amount, relative to the amount of the butadiene, and (b) under hydrogenation conditions sufficient to reduce the concentration of 1,3-butadiene to less than 100 ppm in at least one effluent stream of the process.