The catalytic hydrogenolysis of glycerol, a by-product of the biodiesel manufacturing process was studied on copper chromite
catalysts with different chemical composition. The obtaining of propylene glycol was studied under mild reaction conditions (180-
240oC temperature range, 8 hours reaction time and moderate pressures). These important parameters have significant effects on
the glycerol conversion and that is way the actual study was concerned to the obtaining of a superior selectivity to propylene glycol
by optimizing the reaction conditions. The water content in the raw material seems to damage the process development, coming
out the requirement to use small amounts of water in order to achieve an increased reactor productivity.