There is information on the net that palladium catalysts are very sensitive to poisons in the feed, and that in the past, the more rugged solution was to use presulfided Ni catalyst - the lower selectivity of the Ni catalyst is perhaps much more tolerable compared to the shorter run times and higher sensitivity for Pd catalyst.
Alternatives suggested on the net article indicate that extractive distillation with DMF ( dimethly formamide or some other high dipole moment / polar organic solvent) to remove MA and PD are also possible, but in a running plant, the modifications required may be impractical.