in refining, the chemical
addition of hydrogen to a hydrocarbon in the
presence of a catalyst; a severe form of
hydrogen treating. Hydrogenation may be
either destructive or non-destructive. In the former case, hydrocarbon
chains are ruptured (cracked) and hydrogen is added where the breaks have
occurred. In the latter, hydrogen is added to a molecule that is unsaturated
(see unsaturated hydrocarbon)
with respect to hydrogen. In either case, the resulting molecules are highly
stable. Temperatures and pressures in the hydrogenation process are usually
greater than in Hydrofining.
Also see distillation,
Hydrofined.