The impact of intraparticle diffusion limitations on the selectivity of an industrial reactor for selective hydrogenation of 1-butyne and 1,3-butadiene contained in 1-butene rich cuts was evaluated. To this end, a simple model of a trickle-bed reactor was employed and actual process operating conditions were chosen. A kinetic model was chosen whose parameters correspond to a commercial catalyst. These parameters were calculated from experiments conducted under industrial operating conditions. The complex diffusion and reaction phenomena occurring inside catalyst pellets placed at different depths of the reactor are comprehensively described. 1-Butene losses in the range 20-30 %, which are usual in commercial plants, were predicted. It was concluded that the operating pressure is crucial for enhancing process selectivity.