Method for upgrading a Fischer-Tropsch light oil
AssigneeMobil Oil Corporation
InventorsHenry R. Ireland, Alan W. Peters, Thomas R. Stein
Life of this patent
Estimating the term…
Abstract
The product of Fischer-Tropsch Synthesis is separated to recover a C.sub.5 -400.degree. F liquid fraction which is thereafter hydrogenated in order to saturate diolefins and contacted with a ZSM-5 type zeolite under conditions of elevated temperature and pressure so as to obtain gasoline of a higher octane rating. The contact with the ZSM-5 zeolite is preferably in the presence of added hydrogen.
Claims12
A method for upgrading the C.sub.5 + liquid product of a Fischer-Tropsch synthesis having an end point from about 340.degree.-400.degree. F which comprises hydrogenating said liquid in the presence of a hydrogenation catalyst component at conditions of temperature and pressure so as the selectively hydrogenate substantially only the diolefins contained therein and thereafter contacting said liquid at a temperature within the range of about 575.degree. to about 850.degree. F and at a pressure within the range of from about atmospheric to 700 psig with a crystalline aluminosilicate catalyst component characterized by a pore dimension greater than about 5 Angstroms, a silica to alumina ratio of at least 12, and a constraint index within the range of 1:12 said catalyst being presulfided prior to use, and recovering a gasoline boiling range product having an enhanced octane number.
A method for upgrading the C.sub.5 + liquid fraction of a Fischer-Tropsch synthesis comprising sulfur having an end point of from about 340.degree.-400.degree. F, which comprises hydrogenating said C.sub.5 + liquid by contact with a presulfided hydrogenation catalyst comprising platinum or palladium at a temperature of 100.degree. to 400.degree. F and a pressure of 50 to 800 psig so as to selectively hydrogenate only the diolefins contained therein and thereafter contacting said selectively hydrogenated liquid at a temperature of 575.degree.-850.degree. F and a pressure of from about atmospheric to 700 psig with a crystalline aluminosilicate zeolite selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-21, ZSM-35, and ZSM-38 and recovering a gasoline boiling range product having an enhanced octane number.
Dependencies are inferred from the claim text.