Abstract: A process for reducing the pour point of sulfur containing gas oil fractions to produce fractions, including diesel oil of reduced pour point involving sequential hydrotreating and dewaxing of the gas oil feedstock. The hydrotreating step is carried out over a conventional hydrodesulfurization catalyst to remove sulfur. The dewaxing step is carried out over silicalite at mild dewaxing conditions under which the C.sub.3 and lower gas make is no greater than 2 wt. % based upon the gas oil feed.

Abstract: A process for the alkylation of aromatic hydrocarbons in a reaction zone containing a crystalline silica polymorph silicalite catalyst. The feed stock to the reaction zone comprises an alkylating agent and an aromatic substrate contains sulfur in an amount, greater than 2 ppm, which heretofore has considered to be unacceptable to zeolite catalysts. A steam cofeed may also be applied to the reaction zone in an amount sufficient to reduce the deposition of coke on the catalyst due to the presence of sulfur. Sulfur may be present as a contaminant in the aromatic substrate or the alkylating agent.