in the invention comprise at least one metal on a porous inorganic oxide support preferred catalysts are ni u2014 mo co u2014 mo and ni u2014 w on alumina support the function of the posttreatment reactor is primarily to reduce the amount of hydrogen in the liquid product but also to lower the sulphur and nitrogen content the reduction of hydrogen in the liquid product will be balanced by an increase in the hydrogen purity of the effluent gas the effluent from the posttreatment reactor containing liquids and gases can be passsed through a cooler and introduced into a gas liquid separator where the hydrogen gas along with ammonia and hydrogen sulphide by products from the hydrotreating reactions may be separated from the liquid product the separated gases are usually recycled via a compressor back for reuse in the hydrogen stream the recycled gas can be passed through a scrubber to remove hydrogen sulphide and ammonia because of their inhibiting effects on the kinetics of hydrotreating and also to reduce corrosion in the recycle circuit as the present invention results in a higher content of purity in this recycle gas the amount of make up gas added to compensate for the hydrogen consumed in the hydrotreating process can be lowered alternatively the effluent gas can be utilized in other downstream processes the present invention is illustrated in the following examples of specific embodiments feedstocks a and b table 1 were hydrotreated in a pilot plant consisting of two isothermal reactors in series feedstock a is a straight.