Shell operates at its refinery in Cologne three reactors for the selective hydrogenation and desulfurization of a Pyrolysis gasoline stream (Pygas/C5 to C11). using a Ni-based catalyst. The hydrogenation reaction to saturate di-olefins and olefins taking place in these trickle flow reactor-beds is highly exothermic. Part of the hydrogenated liquid stream and unused hydrogen is recycle... https://poolsproductscanadas.shop/product-category/pentair-e-z-vac-parts/