Method for processing heavy crude oils
First Claim
1. A method for processing heavy crude oils, which comprisesdistilling a 100% heavy crude oil feedstock containing at least 7 weight percent n-pentane insolubles under atmospheric pressure to obtain an atmospheric distillation residue,contacting said atmospheric distillation residue with a selective solvent comprising C4 to C7 aliphatic hydrocarbon or mixtures thereof in an extraction column to extract asphaltenes, carbon, sulfur and metals from said atmospheric distillation residue, said extraction column having a top temperature of 50°
- -250°
C., and a bottom temperature of 40°
-230°
C. while being operated under a pressure 3-40 kg/cm2 with a solvent-hydrocarbon volume ratio of 2;
1 to 10;
1,withdrawing an extract fraction and a raffinate fraction rich in asphaltenes from said extraction column, said extract fraction having an API gravity of 10-18, an SSF viscosity at 50°
C. of 100 to 3,500, 1.0-75 weight percent insolubles in n-pentane and 0.20-5.0 weight percent insolubles in n-heptane, a Ramsbottom carbon of 4.0-12.0 weight percent, 2.0 to 5.0 weight percent sulfur and 75 to 250 ppm metals comprising nickel and vanadium,subjecting said extract fraction to vacuum distillation in a vacuum distillation column at a temperature of 300°
C. to 540°
C. to recover a gas oil stream and a residue stream,catalytically cracking said gas oil stream and feeding said residue to a viscosity breaking unit and viscosity breaking the residue stream, andadmixing said asphaltene-rich raffinate fraction with coking coal and coke fines and subjecting the resulting mixture to coking under conditions to produce metallurgical coke.
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Accused Products
Abstract
A method for processing heavy crude oils comprising a) atmospheric distillation of a heavy crude oil having a high content of metals, asphaltenes and sulfur; b) solvent extraction of the atmospheric distillation residue to obtain an extract with characteristics equivalent to those which an atmospheric residue derived from light crude oil and a raffinate fraction, solid at ambient conditions, in which are concentrated the asphaltenes, metals and sulfur present in the original crude oil; c) vacuum distillation of the deasphalted extract, obtaining a light fraction or gas oils with characteristics adequate to be subjected to a secondary conversion process, plus a bottoms fraction or vacuum residue; d) treatment of the vacuum gas oils in a conversion stage and e) subjecting the bottoms of raffinate from the extraction stage to a metallurgical process, in admixture with cokeable coal and coke fines to production of metallurgical coke.
38 Citations
10 Claims
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1. A method for processing heavy crude oils, which comprises
distilling a 100% heavy crude oil feedstock containing at least 7 weight percent n-pentane insolubles under atmospheric pressure to obtain an atmospheric distillation residue, contacting said atmospheric distillation residue with a selective solvent comprising C4 to C7 aliphatic hydrocarbon or mixtures thereof in an extraction column to extract asphaltenes, carbon, sulfur and metals from said atmospheric distillation residue, said extraction column having a top temperature of 50° - -250°
C., and a bottom temperature of 40°
-230°
C. while being operated under a pressure 3-40 kg/cm2 with a solvent-hydrocarbon volume ratio of 2;
1 to 10;
1,withdrawing an extract fraction and a raffinate fraction rich in asphaltenes from said extraction column, said extract fraction having an API gravity of 10-18, an SSF viscosity at 50°
C. of 100 to 3,500, 1.0-75 weight percent insolubles in n-pentane and 0.20-5.0 weight percent insolubles in n-heptane, a Ramsbottom carbon of 4.0-12.0 weight percent, 2.0 to 5.0 weight percent sulfur and 75 to 250 ppm metals comprising nickel and vanadium,subjecting said extract fraction to vacuum distillation in a vacuum distillation column at a temperature of 300°
C. to 540°
C. to recover a gas oil stream and a residue stream,catalytically cracking said gas oil stream and feeding said residue to a viscosity breaking unit and viscosity breaking the residue stream, and admixing said asphaltene-rich raffinate fraction with coking coal and coke fines and subjecting the resulting mixture to coking under conditions to produce metallurgical coke. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- -250°
Specification