Resid hydrotreating using solvent extraction and deep vacuum reduction
AssigneeAmoco Corporation
InventorsJames L. Taylor, William I. Beaton, Bernard Y. C. So, Jeffrey J. Kolstad
Life of this patent
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Abstract
A resid hydrotreating process hydrotreats a resid bottoms fraction from the reduction of crude oil. The hydrotreated bottoms fraction is then subjected to deep vacuum reduction and in some cases deasphalted by solvent extraction to produce an oil suitable for use as a catalytic cracking feedstock and a resins fraction suitable for solvating resid in a hydrotreating process.
Claims18
A hydrotreating process comprising the steps of:
- hydrotreating a resid feedstock at a temperature between about 700.degree. and 850.degree. F., at a total pressure of between about 2650 and 3050 psig, and at a hydrogen partial pressure of between 1800 and 2300 psig;
- thereafter the hydrotreating step fractionating the hydrotreated feedstock into a hydrotreated resid bottoms fraction and at least one relatively lower boiling fraction;
- thereafter the fractionating step deasphalting the bottoms fraction to remove an asphaltene fraction therefrom;
- and
- thereafter the deasphalting step deep-vacuum reducing the hydrotreated resid bottoms fraction to produce an oil fraction having an upper boiling point cut-off temperature of at least 1050.degree. F.
A process for fractionating a bottoms fraction from a resid hydrotreating unit, said bottoms fraction having been hydrotreated in the hydrotreating unit at a temperature between about 700.degree. and 805.degree. F., at a total pressure of between about 2650 and 3050 psig, and at a hydrogen partial pressure of between 1800 and 2300 psig, said process comprising the steps of:
- thereafter the hydrotreating step removing a substantial portion of material boiling below 850 degrees Fahrenheit from the hydrotreated resid bottoms fraction;
- thereafter deasphalting the bottoms fraction to produce an asphaltene fraction and a resin- and oil-rich fraction;
- and
- thereafter the deasphalting step deep-vacuum reducing the resin- and oil-rich fraction to produce an oil overhead fraction having an upper boiling point cut-off temperature of at least 1050.degree. F. and a resin bottoms fraction.
A process for hydrotreating a resid and producing an oil feedstock therefrom comprising the steps of:
- hydrotreating a virgin resid feedstream by reacting the resid in an ebullated bed reactor in the presence of a hydrocracking catalyst and a hydrogen-rich gas at a temperature between about 700.degree. and 850.degree. F., at a total pressure of between about 2650 and 3050 psig, and at a hydrogen partial pressure of between 1800 and 2300 psig to produce a hydrotreated effluent stream;
- thereafter the hydrotreating step removing a substantial portion of material boiling below 1000 degrees Fahrenheit from the hydrotreated effluent stream by distillation, thereby producing a hydrotreated resid bottoms fraction;
- thereafter the distilling step solvent extracting the bottoms fraction with an alkane solvent containing three to seven carbon atoms at a temperature above about 20 degrees below the critical temperature of the solvent to produce an asphaltene fraction and a resin- and oil-rich solvent fraction;
- thereafter the solvent extracting step separating the asphaltene fraction from the resin- and oil-rich solvent fraction;
- and
- increasing the temperature of the resin- and oil-rich solvent fraction to at least 50 degrees above the critical temperature of the solvent to produce a solvent fraction and a resin and oil fraction;
- and
- thereafter the separating step deep-vacuum reducing the resin- and oil-rich fraction to produce a resin bottoms fraction and an overhead oil fraction containing a substantial portion of material having an upper boiling point cut-off temperature below about 1200 degrees Fahrenheit at atmospheric pressure.
Dependencies are inferred from the claim text.