Abstract: A process for simultaneously desulfurizing and dewaxing raw, untreated, high sulfur-containing wide-cut petroleum oil fractions to produce desulfurized middle distillate oils of low pour point with a minimum cracking of the raw fraction to gases which comprises contacting the raw fraction with hydrogen and a catalyst comprising a hydrogenating component and faujasite on an amorphous support. A particularly preferred catalyst consists of 95 wt.% based on total catalyst of NiO/MoO.sub.3 on an amorphous silica/alumina support and 5 wt.% of nickel-exchanged faujasite.

Abstract: An asphalt-containing mineral oil is deasphalted by contacting the oil with a liquid hydrogen sulfide deasphalting solvent for a time sufficient to remove a substantial portion of the asphalt from the oil. Utilization of liquid hydrogen sulfide as the deasphalting solvent is capable of giving high yields of deasphalted oil. In contrast to the use of aliphatic solvents for deasphalting, the hydrogen sulfide readily mixes with the heavy feed even at relatively low temperatures.

Abstract: A process for hydrotreating middle distillate fraction petroleum feed stocks wherein hydrogen requirements for the hydrotreater are reduced by first passing the feed stock and steam to a steam hydroconversion zone over a dual function catalyst comprising molybdenum on a chromium supported on ferric oxide support or on a high surface area alumina support. In the steam hydroconversion zone a portion of the feed reacts with the steam to produce hydrogen via a steam reforming reaction. This hydrogen is used in situ to saturate a substantial portion of the olefins and remove some of the sulfur compounds present in the feed stock, thereby partially refining same. The partially refined feed is then passed to a hydrotreating zone for further treatment with greatly reduced hydrogen requirements in said hydrotreating zone.