Process for the production of medicinal white oil
AssigneeExxon Research & Engineering Co.
InventorsSylvain Hantzer, Alberto Ravella, Ian A. Cody, Darryl P. Klein
Life of this patent
Estimating the term…
Abstract
A three stage process for producing high quality white oils, particularly food grade mineral oils from mineral oil distillates. The first reaction stage preferably employs a sulfur resistant hydrotreating catalyst and produces a product suitable for use as a high quality lubricating oil base stock. The second reaction stage preferably employs a hydrogenation/hydrodesulfurization catalyst combined with a sulfur sorbent and produces a product stream which is low in aromatics and which has substantially “nil” sulfur. The final reaction stage employs a selective hydrogenation catalyst that produces a product suitable as a food grade white oil.
Claims17
A process for the preparation of pharmaceutical grad white oils from a feedstock, by a three stage catalytic process, which process comprises:
- (a) hydrotreating said feedstock in a first reaction stage containing a hydrotreating catalyst and a hydrogen-containing treat gas, which first reaction stage is operated under hydrotreating conditions, thereby resulting in said feedstock being at least partially hydrogenated and desulfurized, wherein the feedstock is a raffinate derived from a solvent treatment of a light or medium neutral distillate oil of lubricating viscosity, the raffinate having a viscosity ranging from about 70 to about 500 SUS at 37.8° C.;
- (b) hydrotreating the reaction product of said first reaction stage in a second reaction stage in the presence of:
- (i) a hydrodesulfurization catalyst comprised of a Group VIII metal on an inorganic support, (ii) a hydrogen-containing treat gas, and (iii) a hydrogen sulfide sorbent material, wherein said second reaction stage is operated at temperatures from about 40° C. to 500° C. and pressures from about 100 to 3,000 psig;
- and (c) hydrogenating the reaction product from said second reaction stage in a third reaction stage in the presence of a nickel based catalyst, thereby producing a white oil.
Dependencies are inferred from the claim text.