HIGH SEVERITY REFORMING PROCESS WITH A PLATINUM/IRIDIUM CATALYST

摘要

1461947 Reforming naphtha EXXON REEARCH & ENG CO 29 March 1974 [12 April 1973] 13975/74 Heading C5E Naphtha having a Watson characterisation factor of 11À4 to 12À2 is reformed by contacting with hydrogen and a catalyst comprising alumina, 0À15-0À75 wt./% Pt, 0À15-0À45% Ir and 0À3-2À0% halogen, e.g. chlorine, containing less than 2 atoms sulphur per atom of Pt and Ir and being substantially free of alkali and alkaline earth metal constituents and in which the surface area of the Pt and Ir is at least 200 m2/g, the contacting being carried out at below 1050‹ F, 150-600 p.s.i.g. a hydrogen to naphtha molar ratio (H/O) of 2À5:1 to 8:1 and a space velocity (W/H/W) of 0À5 to 6À0 to produce a C 5+ reformate having a Research Octane Number Clear (RON) of 94 to 102 without incurring a C 5+ liquid yield decline greater than 3À0 volume % relative to the yield obtained 200 hours after initial contact of the feed with fresh or regenerated catalyst for an on-stream period within the limits of band A of the Figure wherein the severity factor is determined by the equation: severity factor = -43À78 + 0À44 (RON) - 0À70 In (H/O) + 2À0 ln (W/H/W).