fraction may be further upgraded in accordance with well known procedures to yield a high quality gasoline the material withdrawn through line 219 boils generally within the known fuel oil ranges and may be used as such or further upgraded and used either as a diesel fuel or as a fuel oil the material withdrawn through line 217 boils generally within the vacuum gas oil range and may be used as such or further upgraded or converted to different boiling range materials the bottoms product withdrawn through line 218 may be at least partially recycled to the conversion reactor burned for fuel value or discarded having thus broadly described the present invention and a preferred embodiment thereof it is believed that the same will become more apparent by reference to the following examples it will be appreciated however that the examples are presented solely for purposes of illustration and should not be construed as limiting the invention in this example four runs were completed in an autoclave using a vacuum resid from a heavy arab crude oil having an initial boiling point of 1000 u00b0 f to determine the effect of hydrogen partial pressure on conversion in each run a raw creosote oil was used the solvent was used at a ratio of 1 5 1 based on petroleum residual in the initial blend the solvent was then capable of donating 2 4 weight percent hydrogen based on petroleum resid in the initial mixture the solvent.