Title: Manufacture of low sulfur fuel oils from oil shale
Abstract: Raw shale oil produced by a TOSCO retorting process has a low sulfur content, which allows manufacture of fuel oil with minimum processing. No. 6 fuel oil containing 0.75% by wt sulfur can be produced from shale oil without hydrodesulfurization. The raw oil is topped to a 270$F initial boiling point to meet flash specifications. If minimum viscosity is specified, a 420$F initial boiling point would be required. Where legal restrictions require low sulfur content, hydrotreating of the distillate and gas oil fractions of the fuel oil will reduce the sulfur content below 0.3%. A combination of No. 2 and No. 6 fuel oils can be made by fractionating the raw shale oil. The No. 2 fuel oil fraction (240$ and 580$F) is hydrotreated for stability improvement and sulfur reduction. Unhydrotreated No. 6 fuel from this type of process would have 0.7% sulfur. Hydrotreating the gas oil fraction allows production of No. 6 fuel oil with 0.3% sulfur. The following conclusions were reached in this investigation: (1) low sulfur No. 6 fuel oil can be made from raw shale oil without hydrotreating; (2) the low sulfur level in the shale oil bottoms allows production of No. 6 fuel oil with more » 0.3% sulfur with only mild hydrotreating; and (3) the combination of No. 2 and No. 6 fuel oils can be made by moderate hydrotreating of raw shale oil. « less
Publication Year: 1972
Publication Date: 1972-01-01
Language: en
Type: article
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