Process and facility for making coke suitable for metallurgical purposes
First Claim
Patent Images
1. A process for the production of metallurgical coke from a heavy crude oil feedstock comprising:
- (a) providing a crude oil feedstock inlet;
(b) feeding a crude oil feedstock to said crude oil inlet, said crude oil feedstock being characterized by the following composition and properties;
space="preserve" listing-type="tabular">______________________________________ Gravity, °
API 6-12 Viscosities;
KV at 180°
F., cst 400-2500 KV at 140°
F., cst 2000-20000 KV at 122°
F., cst 5000-40000 Metals Content;
Iron, wt ppm 15-25 Vanadium, wt ppm 300-500 Nickel, wt ppm 60-120 Asphaltenes, % wt 6-12 Salt Content as NaCl, Lbs/1000 BBls. 35-1000 Pour Point, °
F. 50-90 Sulfur, % wt 3.5-4.5 Water and Sediments, % Vol 0.2-10 ______________________________________ (c) mixing said crude oil feedstock with a diluent in an amount equal to about 10 to 50% by volume, said diluent being characterized by a gravity of between 20 to 65 API and a boiling point range of between 150°
F. and 800°
F.;
(d) feeding the crude oil and diluent mixture to an atmospheric distillation unit wherein said crude oil and diluent mixture is subjected to distillation whereby gas products, a 500°
F. minus liquid overheat hydrocarbon product and 500°
F. plus residuum are produced;
(e) feeding the atmospheric distillation residuum to a combination tower comprising a heat transfer portion and a fractionator portion wherein said distillation residuum is subjected to fractionation so as to produce a reduced coker feed;
(f) withdrawing said reduced coker feed from the fractionator portion of said combination tower and passing said reduced coker feed to a delayed coking drum wherein the coker feed decomposes leaving a mass of metallurgical coke;
(g) recycling the coker effluent from said delayed coking drum directly to the fractionator portion of said combination tower;
(h) contacting said atmospheric distillation residuum with said coker effluent in the fractionator portion of said combination tower so as to produce a reduced coker feed mixed with recycle;
(i) withdrawing said coker feed mixed with recycle from the fractionator portion of said combination tower and passing said coker feed mixed with recycle to a delayed coking drum wherein the coker feed mixed with recycle decomposes leaving a mass of metallurgical coke; and
(j) recycling the coker effluent from said delayed coking drum directly to the fractionator portion of said combination tower wherein said incoming atmospheric distillation residuum is contacted with the coker effluent.
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Abstract
Process and facility for upgrading heavy hydrocarbonaceous materials for making coke suitable for metallurgical purposes comprises mixing the heavy hydrocarbonaceous materials with a diluent having a closely controlled boiling range and subjecting the oil diluent mixture to distillation and careful fractionation so as to maximize liquid yields in the coking step.
32 Citations
13 Claims
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1. A process for the production of metallurgical coke from a heavy crude oil feedstock comprising:
-
(a) providing a crude oil feedstock inlet; (b) feeding a crude oil feedstock to said crude oil inlet, said crude oil feedstock being characterized by the following composition and properties;
space="preserve" listing-type="tabular">______________________________________ Gravity, °
API 6-12 Viscosities;
KV at 180°
F., cst 400-2500 KV at 140°
F., cst 2000-20000 KV at 122°
F., cst 5000-40000 Metals Content;
Iron, wt ppm 15-25 Vanadium, wt ppm 300-500 Nickel, wt ppm 60-120 Asphaltenes, % wt 6-12 Salt Content as NaCl, Lbs/1000 BBls. 35-1000 Pour Point, °
F. 50-90 Sulfur, % wt 3.5-4.5 Water and Sediments, % Vol 0.2-10 ______________________________________(c) mixing said crude oil feedstock with a diluent in an amount equal to about 10 to 50% by volume, said diluent being characterized by a gravity of between 20 to 65 API and a boiling point range of between 150°
F. and 800°
F.;(d) feeding the crude oil and diluent mixture to an atmospheric distillation unit wherein said crude oil and diluent mixture is subjected to distillation whereby gas products, a 500°
F. minus liquid overheat hydrocarbon product and 500°
F. plus residuum are produced;(e) feeding the atmospheric distillation residuum to a combination tower comprising a heat transfer portion and a fractionator portion wherein said distillation residuum is subjected to fractionation so as to produce a reduced coker feed; (f) withdrawing said reduced coker feed from the fractionator portion of said combination tower and passing said reduced coker feed to a delayed coking drum wherein the coker feed decomposes leaving a mass of metallurgical coke; (g) recycling the coker effluent from said delayed coking drum directly to the fractionator portion of said combination tower; (h) contacting said atmospheric distillation residuum with said coker effluent in the fractionator portion of said combination tower so as to produce a reduced coker feed mixed with recycle; (i) withdrawing said coker feed mixed with recycle from the fractionator portion of said combination tower and passing said coker feed mixed with recycle to a delayed coking drum wherein the coker feed mixed with recycle decomposes leaving a mass of metallurgical coke; and (j) recycling the coker effluent from said delayed coking drum directly to the fractionator portion of said combination tower wherein said incoming atmospheric distillation residuum is contacted with the coker effluent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9)
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8. A process for the production of metallurgical coke from a heavy crude oil feedstock comprising:
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(a) providing a crude oil feedstock inlet; (b) feeding a crude oil feedstock to said crude oil inlet, said crude oil feedstock being characterized by the following composition and properties;
space="preserve" listing-type="tabular">______________________________________ Gravity, °
API 6-12 Viscosities;
KV at 180°
F., cst 400-2500 KV at 140°
F., cst 2000-20000 KV at 122°
F., cst 5000-40000 Metals Content;
Iron, wt ppm 15-25 Vanadium, wt ppm 300-500 Nickel, wt ppm 60-120 Asphaltenes, % wt 6-12 Salt Content as NaCl, Lbs/1000 BBls. 35-1000 Pour Point, °
F. 50-90 Sulfur, % wt 3.5-4.5 Water and Sediments, % Vol 0.2-10 ______________________________________(c) mixing said crude oil feedstock with diluent in an amount equal to about 10 to 50% by volume, said diluent being characterized by a gravity of between 20 to 65 API and a boiling point range of between 150°
F. and 800°
F.;(d) feeding the crude oil and diluent mixture to an atmospheric distillation unit wherein said crude oil and diluent mixture is subjected to distillation whereby gas products, a 500°
F. minus liquid overhead hydrocarbon product and a 700°
F. plus residuum are produced;(e) feeding the atmospheric distillation residuum to a vacuum distillation unit wherein said atmospheric distillation residuum is subjected to vacuum distillation whereby gas and liquid hydrocarbon distillate products and a 900°
F. plus vacuum residuum are produced;(f) feeding said vacuum residuum to a combination tower comprising a heat transfer portion and a fractionator portion wherein said vacuum residuum is subjected to fractionation so as to produce a reduced coker feed; (g) withdrawing said reduced coker feed from the fractionator portion of said combination tower and passing said reduced coker feed to a delayed coking drum wherein the coker feed decomposes leaving a mass of metallurgical coke; (h) recycling the coker effluent from said delayed coking drum directly to the fractionator portion of said combination tower; (i) contacting said vacuum residuum with said coker effluent in the fractionator portion of said combination tower so as to produce a reduced coker feed mixed with recycle; (j) withdrawing said coker feed mixed with recycle from the fractionator portion of said combination tower and passing said coker feed mixed with recycle to a delayed coking drum wherein the coker feed mixed with recycle decomposes leaving a mass of metallurgical coke; and (k) recycling the overhead products from said delayed coking drum directly to the fractionator portion of said combination tower wherein said incoming vacuum residuum is contacted with the coker effluent. - View Dependent Claims (10, 11, 12, 13)
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Specification