Low-sulfur fuel
AssigneeExxonMobil Research and Engineering Company
InventorsGordon F. Stuntz, Robert C. W. Welch, Thomas R. Halbert
Life of this patent
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Abstract
The invention relates to a process for forming a low-sulfur motor gasoline and the product made therefrom. In one embodiment, process involves separating a catalytically cracked naphtha into at least a light fraction boiling below about 165° F. and a heavy fraction boiling above about 165° F. The light fraction is treated to remove sulfur by a non-hydrotreating method, and the heavy fraction is hydrotreated to remove sulfur to a level of less than about 100 ppm.
Claims26
A method for forming a low-sulfur, high-octane naphtha suitable for gasoline blending, the process comprising
- (a) separating a catalytically cracked naphtha into at least a light fraction and a heavy fraction, the heavy fraction having an olefin portion containing C5 olefins, C6 olefins, and olefins having a molecular weight greater than C6;
- (b) treating the light fraction to remove sulfur at a hydrogen partial pressure of less than about 50 psig H2 to form a treated light fraction having a sulfur content less than about 150 ppm;
- and then
- (c) treating the heavy fraction in the presence of a hydrogen-containing gas and a catalytically effective amount of a hydroprocessing catalyst under catalytic conversion conditions in order to form a treated heavy fraction having a sulfur content less than about 150 ppm and wherein the hydrotreated heavy fraction contains at least 10% of the C6+ olefins in the heavy fraction.
The method of claim 8 wherein the hydroprocessing catalyst contains about 0.5 wt. % to about 20 wt. % of at least one Group VIII metal and about 1 wt. % to about 50 wt. % of a Group IV metal on an inorganic support.
The method of claim 9 wherein the catalyst contains about 1 wt. % to about 10 wt. % M0O3 and about 0.1 wt. % to about 5 wt. % CoO, wherein the support contains at least one of silica and alumina, wherein the catalyst has a metals dispersion by the Oxygen Chemisorption Test ranging from about 800 μmol oxygen/gram of MoO3, and wherein the catalytic conversion conditions are selective hydroprocessing conditions.
The method of claim 10 wherein the catalyst further comprises about 0 to about 0.5 wt. % of at least one Group IA element, based on the weight of the support.
A light and heavy hydroprocessed product formed by a process comprising
- (a) separating a catalytically cracked naphtha into at least a light fraction and a heavy fraction, the heavy fraction having an olefin portion containing C5 olefins, C6 olefins, and olefins having a molecular weight greater than C6;
- (b) treating the light fraction to remove sulfur at a hydrogen partial pressure of less than about 50 psig H2 to form a treated light fraction having a sulfur content less than about 150 ppm;
- and then
- (c) treating the heavy fraction in the presence of a hydrogen-containing gas and a catalytically effective amount of a hydroprocessing catalyst under catalytic conversion conditions in order to for a treated heavy fraction having a sulfur content less than about 150 ppm and wherein the hydrotreated heavy fraction contains at least 10% of the C6+olefin in the heavy fraction.
A hydrocarbon boiling in the naphtha boiling range comprising C5 olefins, C6 olefins, and olefins having more than 6 carbon atoms, wherein
- (i) the hydrocarbon contains more than about 12 wt. % olefins, based on the weight of the hydrocarbon;
- (ii) the hydrocarbon contains an amount of olefins having five or more carbon atoms that are C5 and C6 olefins ranging from about 37% to about 84%;
- and
- (iii) the hydrocarbon contains less than about 60 ppm sulfur, based on the weight of the hydrocarbon.
Dependencies are inferred from the claim text.