| abstract |
1440230 Lubricating oils SHELL INTERNATIONALE RESEARCH MAATSCHAPPIJ BV 2 Aug 1973 [4 Aug 1972] 36732/73 Heading C5E A feed composed of a vacuum distillate and/or deasphalted residual mineral oil is catalytically hydrocracked in the presence of hydrogen and a hydrocracking catalyst, the portion of the oil boiling above 350-400‹ C. is dewaxed to produce a high viscosity index lubricating oil and wax, the wax is subjected to catalytic hydroisomerization in the presence of hydrogen and a catalyst comprising (a) boron, (b) an oxidic carrier, (c) Fe, Co and/or Ni, and (d) Cr, Mo and/or W and lubricating oil of high viscosity index is obtained by dewaxing the hydroisomerization product. The hydrocracking can be carried out at 300-550‹ C. and 50-250 bar abs. using a catalyst such as nickel and molybdenum on alumina containing F and P. The hydroisomerization can be carried out at 310-150‹ C. and 50-200 bar; and the wax obtained by dewaxing this effluent can be recycled to the hydrocracking or hydroisomerization step. The wax obtained from the hydrocracked material can be recycled to the hydrocracking reactor together with the mineral oil feed and therein subjected to a combined hydrocracking-hydroisomerization process, or hydroisomerized in a separate reactor either by itself or together with a portion of the mineral oil feed. In examples a propane-deasphalted residual oil is hydrocracked, the effluent fraction boiling above 400‹ C. is dewaxed with a methyl ethyl ketone-toluene mixture to produce oil of V.I. 130 and slack wax which is hydroisomerized with a sulphided catalyst, and the isomerization effluent boiling above 400‹ C. is dewaxed to produce oil of V.I. 158. |