Oil stabilization
AssigneeAmoco Corporation
InventorsJames L. Taylor, Albert L. Hensley, John M. Forgac, David F. Tatterson
Life of this patent
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Abstract
A method for stabilizing oil is provided. An oil fraction having hydrocarbons with an initial boiling point of about 200.degree. F. to about 1050.degree. F. is hydrotreated to reduce the nitrogen content of the oil fraction to be stabilized. Subsequently, condensed aromatic compounds are selectively extracted from the hydrotreated oil fraction to yield a stable oil fraction.
Claims41
A method for stabilizing an oil fraction comprising hydrocarbons having an initial boiling point of about 200.degree. F. to about 1050.degree. F., said method comprising the steps of:
- hydrotreating an oil feedstock comprising an aromatic-containing oil fraction to be stabilized containing at least about 1 weight percent of nitrogen, said oil fraction to be stabilized comprising hydrocarbons having an initial boiling point of about 200.degree. F. to about 1050.degree. F. and a hydrogen-to-carbon atomic ratio of at least about 1.4 in a hydrotreater to reduce the nitrogen content of said fraction to be stabilized to a range of about 200 ppm to about 10,000 ppm and to also reduce the aromatic content of said oil fraction to result in a hydrotreated material liquid yield of greater than 100 percent;
- and
- removing condensed aromatic compounds from at least said oil fraction to be stabilized of said hydrotreated feedstock to yield a stable oil fraction.
A method for preparing a stabilized middle distillate oil fraction from a syncrude oil feedstock, said method comprising the steps of:
- hydrotreating a syncrude oil feedstock containing at least about 1 weight percent of nitrogen and comprising an aromatic-containing middle distillate oil fraction having a hydrogen-to-carbon atomic ratio of at least about 1.4 in a hydrotreater to reduce the nitrogen content of said oil fraction being hydrotreated to a range of about 200 ppm to about 10,000 ppm and to also reduce the aromatic content of said oil fraction to result in a hydrotreated material liquid yield of greater than 100 percent;
- and
- selectively extracting said hydrotreated middle distillate fraction which contains condensed aromatic compounds by contacting said fraction with a solvent selective for removing condensed aromatic compounds to yield a stable middle distillate oil fraction.
A method for preparing a stabilized middle distillate oil fraction comprising hydrocarbons having an initial boiling point of about 350.degree. F. to 650.degree. F. comprising the steps of:
- fractionating an aromatic-containing crude shale oil feedstock containing at least about 1 weight percent of nitrogen and having a hydrogen-to-carbon atomic ratio in the range of at least about 1.4 to about 1.6 to yield at least a middle distillate oil fraction;
- hydrotreating said middle distillate oil fraction in a hydrotreater to reduce the nitrogen content of at least said oil fraction to a range of about 200 ppm to about 10,000 ppm and to also reduce the aromatic content of said oil fraction to result in a hydrotreated material liquid yield of greater than 100 percent;
- and
- selectively extracting said hydrotreated middle distillate fraction which contains condensed aromatic compounds by contacting said fraction with a solvent selective for condensed aromatic compounds, said solvent selected from the group consisting of aqueous solutions of N-methyl pyrrolidone, furfural, dimethyl formamide and phenol, to yield a stable middle distillate oil fraction having a nitrogen content of up to about 1,000 ppm.
Dependencies are inferred from the claim text.