Hydrotreated gasoline octane numbers

Table IX. Catalytic Cracking of Hydrotreated Oils Gasoline Octane Numbers...

In conclusion, pillared clays catalysts are not as good as initially predicted for the cracking of heavy gas oils, mainly because of the iron contamination of natural clays. There is a probability that they could be applied for the conversion of hydrotreated gas oils, giving a slightly lower gasoline yield, but higher octane number than REY zeolites. 

Light straight-run gasoline Composed primarily of components >C5with a cut point typically between 180°F to 200°F (82.2°C to 93.3°C). It is separated from heavy straight-run gasoline and is caustic washed, hydrotreated, or sweetened the octane number is sometimes improved through isomerization. 

Naphtha to become a suitable component tor blending into finished gasoline pools must be further processed. The octane number will range from 40 to 50. Prior to introduction into a catalytic-reforming unit, most naphtha feedstocks are hydrotreated in the interest of prolonging the life of the reforming catalyst. 

Neither is suitable as a direct gasoline blending stock or as reformer feed. Additional hydrotreating is required to reduce the nitrogen content to levels acceptable to catalytic reforming, which is required to boost the octane number of this material. 

---