Combination of mild hydrotreating and hydrocracking for making low sulfur diesel and high octane naphtha
AssigneeUop LLC
InventorsBart Dziabala, Vasant P. Thakkar, Suheil F. Abdo
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Abstract
Methods are disclosed for the hydrotreating and hydrocracking of highly aromatic distillate feeds such as light cycle oil (LCO) to produce ultra low sulfur gasoline and diesel fuel. Optimization of hydrotreater severity improves the octane quality of the gasoline or naphtha fraction. In particular, the operation of the hydrotreater at reduced severity to allow at least about 20 ppm by weight of organic nitrogen into the hydrocracker feed is shown to lead to these important benefits. Post-treating of the hydrocracker effluent over an additional hydrotreating catalyst bed may be desired to meet specifications for ultra low sulfur fuel components.
Claims11
A method for making ultra low sulfur diesel and ultra low sulfur gasoline, the method comprising
- (a) hydrotreating a Light Cycle Oil (LCO) feedstock under mild hydrotreating conditions to provide a hydrotreated LCO containing from about 20 to about 100 parts per million by weight (wt-ppm) of organic nitrogen, and
- (b) hydrocracking the hydrotreated LCO in the presence of a hydrocracking catalyst comprising a metal selected from the group consisting of nickel, cobalt, tungsten, molybdenum, and mixtures thereof, deposited on a zeolite selected from the group consisting of a Y zeolite, a beta zeolite, and an MFI zeolite, to obtain a hydrocracked product,
- (c) hydrotreating the hydrocracked product to provide an upgraded hydrocarbon product having a reduced sulfur content, and
- (d) fractionating the upgraded hydrocarbon product into (i) naphtha having a distillation end point temperature from about 149° C. (300° F.) to about 204° C. (400° F.), a Research Octane Number (RON) of at least about 85, and sulfur content of less than about 10 wt-ppm, and (ii) diesel fuel having a sulfur content of less than about 10 wt-ppm.
Dependencies are inferred from the claim text.