Preparation of lower sulfur and higher sulfur cokes
First Claim
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1. A process for producing a lower sulfur coke and higher sulfur coke from a single feedstock which comprises:
- (1) catalytically hydrotreating a virgin heavy oil having an API gravity of from about -5 to about 25 and an initial boiling point of from about 550°
F. to about 1,000°
F. to reduce the sulfur content of the hydrotreated product to not more than about 0.75 weight percent.(2) separating the hydrotreated product into a heavy fraction and a light fraction,(3) separately subjecting each fraction to delayed coking,(4) calcining the resulting green coke products to obtain (a) from the coked light fraction a low sulfur calcined coke, and (b) from the coked heavy fraction a higher sulfur calcined coke.
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Abstract
A virgin heavy oil is hydrotreated, separated into a light fraction and a heavy fraction which are separately delay coked to obtain (a) a coke product of low sulfur content suitable for use as recarburizer coke or for use in the manufacture of graphite electrodes used in the manufacture of steel and (b) a coke product of higher sulfur content suitable for use in electrodes employed in the manufacture of aluminum.
32 Citations
8 Claims
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1. A process for producing a lower sulfur coke and higher sulfur coke from a single feedstock which comprises:
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(1) catalytically hydrotreating a virgin heavy oil having an API gravity of from about -5 to about 25 and an initial boiling point of from about 550°
F. to about 1,000°
F. to reduce the sulfur content of the hydrotreated product to not more than about 0.75 weight percent.(2) separating the hydrotreated product into a heavy fraction and a light fraction, (3) separately subjecting each fraction to delayed coking, (4) calcining the resulting green coke products to obtain (a) from the coked light fraction a low sulfur calcined coke, and (b) from the coked heavy fraction a higher sulfur calcined coke. - View Dependent Claims (2, 3, 4)
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5. A process for producing a lower sulfur and lower CTE coke and a higher sulfur and higher CTE coke from a single feedstock which comprises:
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(1) subjecting a virgin residual oil having an API gravity of from about -5 to about 25 and an initial boiling point of from about 550°
F. to about 1,000°
F. to catalytic hydrotreating under conditions to provide a hydrotreated product having a sulfur content of not more than about 0.75 weight percent sulfur.(2) separating the hydrotreated product into two fractions, a light fraction and a heavy fraction, the light fraction having a maximum boiling point between about 850°
F. and about 1150°
F., and the remaining higher boiling portion of the hydrotreated product comprising the heavy fraction.(3) separately subjecting each fraction to delayed coking, (4) calcining the resulting green coke products to obtain (a) from the coked light fraction a calcined coke containing less than 0.1 weight percent sulfur and having a CTE of between about 0 and about 3×
10-7 /°
C., and (b) from the coked heavy fraction a calcined coke containing more than 0.1 weight percent sulfur and having a CTE above about 3×
10-7 /°
C. - View Dependent Claims (6, 7, 8)
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Specification
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Current AssigneeConoco Incorporated (ConocoPhillips)
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Original AssigneeConoco Incorporated (ConocoPhillips)
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InventorsNewman, Bruce A., Chahar, Bharat S.
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Primary Examiner(s)Myers, Helane
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Application NumberUS07/275,295Time in Patent Office419 DaysField of Search208/50, 208/78, 208/80, 208/89, 208/131, 423/450, 423/461US Class Current208/131CPC Class CodesC10B 55/00 Coking mineral oils, bitume...C10G 69/00 Treatment of hydrocarbon oi...
