The catalytic hydrocracking process facilitates virtually complete conversion of the feedstock. The objective is to break down the large molecules of the wax distillate into smaller molecules. To do this, gas oil is mixed with hydrogen, heated and conveyed through a reactor with a fixed bed catalyst. The hydrocarbons then pass into a separator, where excess hydrogen is separated and returned to the cycle. The gases are then separated. This process continues until the feedstock is completely converted, producing petrol, diesel and light heating oil.