Demetalation of heavy hydrocarbon oils
AssigneeMobil Oil Corporation
InventorTsoung Y. Yan
Life of this patent
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Abstract
This invention provides a method for coprocessing of heavy hydrocarbon oil and coal to achieve demetalation of the oil and liquefaction of the coal. An essential aspect of the process is a two-stage visbreaking system in which the oil and coal are heat-treated respectively at the optimum severity for each, with little formation of coke byproduct.
Claims17
A process for heavy hydrocarbon oil demetalation which comprises (1) heating a heavy hydrocarbon oil in a first stage visbreaking zone at a temperature between about 800.degree.-1000.degree. F. for a residence time between about 0.1-2 hours;
- (2) admixing the first stage visbroken effluent with particulate coal and heating the admixture in a second stage visbreaking zone at a temperature between about 700.degree.-850.degree. F. for a residence time between about 0.1-2 hours;
- and (3) recovering the second stage visbroken effluent and fractionating it to provide liquid and solid products.
A process for heavy hydrocarbon oil demetalation and coal liquefaction which comprises (1) heating a heavy hydrocarbon oil in a first stage visbreaking zone at a temperature between about 800.degree.-1000.degree. F. for a residence time between about 0.1-2 hours;
- (2) admixing the first stage visbroken effluent with particulate coal and heating the admixture in a second stage visbreaking zone at a temperature between about 700.degree.-850.degree. F. for a residence time between about 0.1-2 hours;
- (3) subjecting the visbroken admixture to solvent deasphalting to provide an oil fraction and a precipitated asphaltic solids fraction;
- and (4) distilling the said oil fraction to remove the deasphalting solvent and yield a demetalized liquid hydrocarbon product.
A process for heavy hydrocarbon oil demetalation and coal liquefaction which comprises (1) heating a heavy hydrocarbon oil in a first stage visbreaking zone at a temperature between about 800.degree.-1000.degree. F. for a residence time between about 0.1-2 hours;
- (2) admixing the first stage visbroken effluent with particulate coal and heating the admixture in a second stage visbreaking zone at a temperature between about 700.degree.-850.degree. F. for a residence time between about 0.1-2 hours;
- (3) removing a light end fraction and then subjecting the second stage visbroken effluent to solvent deasphalting to provide an oil fraction and a precipitated asphaltic solids fraction;
- (4) distilling the said oil fraction to remove the deasphalting solvent and yield a demetalized liquid hydrocarbon product, and (5) treating the said asphaltic solids fraction under flotation conditions in an aqueous medium to separate a float phase of organic solids product from a sink phase of inorganic ash.
A process for heavy hydrocarbon oil demetalation and coal liquefaction which comprises (1) heat-treating a heavy hydrocarbon oil in a first stage visbreaking zone at the highest Severity that yields not more than about 1.0 weight percent coke formation;
- (2) admixing the first stage visbroken effluent with particulate coal and heat-treating the admixture in a second stage visbreaking zone at the highest Severity that yields not more than about 10.0 weight percent coke formation;
- and (3) recovering the second stage visbroken effluent and fractionating it to provide liquid and solid products.
A process for heavy hydrocarbon oil demetalation and coal liquefaction which comprises (1) heating a heavy hydrocarbon oil in a first stage visbreaking zone at a temperature between about 800.degree.-1000.degree. F. and a residence time between about 0.1-2 hours;
- (2) admixing the first stage visbroken effluent with particulate coal and a quantity of anti-solvent, and heating the admixture in a second stage visbreaking zone at a temperature between about 700.degree.-850.degree. F. for a residence time between about 0.1-2 hours to provide a visbroken admixture consisting of an oil fraction and a precipitated ash solids fraction;
- and (3) recovering and distilling the said oil fraction to remove the deashing anti-solvent and yield a demetalized liquid hydrocarbon product.
Dependencies are inferred from the claim text.