Gasoline upgrading process
AssigneeMobil Oil Corporation
InventorsTimothy T. Hilbert, Dominick N. Mazzone, Michael S. Sarli
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Abstract
A process for catalytically desulfurizing cracked fractions in the gasoline boiling range to acceptable sulfur levels uses an initial hydrotreating step to desulfurize the feed with some reduction in octane number, after which the desulfurized material is treated with a self-bound or binder-free zeolite to restore lost octane. The process may be utilized to desulfurize catalytically and thermally cracked naphthas such as FCC naphtha as well as pyrolysis gasoline and coker naphthas, while maintaining octane so as to reduce the requirement for reformate and alkylate in the gasoline blend. The self-bound catalyst offers advantages in activity and permits the process to be carried out at lower temperatures.
Claims20
In a process of upgrading a cracked, olefinic sulfur-containing feed fraction boiling in the gasoline boiling range by contacting the cracked, olefinic sulfur-containing feed fraction with a hydrodesulfurization catalyst in a first reaction zone, operating under a combination of elevated temperature, elevated pressure and an atmosphere comprising hydrogen, to produce an intermediate product comprising a normally liquid fraction which has a reduced sulfur content and a reduced octane number as compared to the feed;
- contacting at least the gasoline boiling range portion of the intermediate product in a second reaction zone with a catalyst comprising shaped particles of an acidic zeolite, to convert the gasoline boiling range portion of the intermediate product to a product comprising a fraction boiling in the gasoline boiling range having a higher octane number than the gasoline boiling range fraction of the intermediate product, the improvement comprising the use as the catalyst in the second reaction zone of a catalyst comrising shaped particles of a self-bound acidic zeolite.
Dependencies are inferred from the claim text.