bottom fraction withdrawing from the fractionation section the heavy bottom fraction splitting the heavy bottom fraction in a stream for stripping and a heavy bottom fraction recycle stream stripping the stream for stripping with a stripping medium in a counter current stripping column to form an overhead vapor and a stripped liquid feeding the overhead vapor to the fractionation section to a recycle stream or to a position upstream the fractionation section application_number US 201113880356 A description reference is made to fig1 which illustrates schematically the process flows and equipment configuration as embodied in this invention fresh feedstock consisting of a hydrocarbonaceous feed such as petroleum or synthetic heavy gas oils of mineral or biological origin 1 is combined with hydrogen rich gas 2 and an optional recycle stream of unconverted product 16 and fed to a hydrocracking zone 3 consisting of one or more catalysts contained in one or more reaction vessels the catalysts promote the hydroconversion of the hydrocarbonaceous feedstock which may include hydrogenation to a lighter hydrocracked effluent the hydrocracking effluent comprising hydrocarbon products together with excess hydrogen not consumed by the reaction exits the hydrocracking zone 4 and enters a separation zone 5 consisting of one or more vessels that perform separation into a first vapour portion and a first liquid portion the first vapour portion 6 from the separation zone may be combined with makeup hydrogen 7 to replenish the hydrogen consumed by reaction the hydrogen rich stream may then be compressed in compressor 8 for recycle back to the hydrocracking zone the first liquid portion 9 from the separation step passes to a process heater 10 supplying energy for substantially vapourising the fluid 11 before feeding the product fractionation section 12.