Patent US3954674A successfully refreshed from Google Patents.
US3954674A
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Process and device for calcinating desulfurization of green cokes with high sulfur content by the preparation of high quality and density desulfurized cokes
Assignee: Individual
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Filing: 1973-12-26
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Granted: 1976-05-04
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Expires: 1993-12-26
Abstract
Abstract This invention relates to a process for the simultaneous desulfurization and calcination of "green coke."
Inventors
- 👤 Thomas Reis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:02
CPC Classifications
G; G07; G07C; G07C3/00; G07C3/005; C; C10; C10B; C10B7/00; C10B7/02; C10L; C10L9/00; C10L9/08; Y; Y10; Y10T; Y10T436/00; Y10T436/18; Y10T436/188
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
124 words
A process of producing electrode-grade carbon from green coke having a sulfur content higher than 3% by weight, said process comprising subjecting said coke to a desulfurizing calcination treatment under a reducing atmosphere at a temperature of 1,400° - 1,700° C. and within the temperature range at which the density of the coke decreases as the temperature increases, said treatment being conducted at least until the content of sulfur in the coke is reduced to 1.2% by weight, but at a sufficiently slow rate of coke crystallization to form open pores in the coke, thereby permitting sulfurized compounds to escape from the coke, controlling said process during said treatment by continuously sampling and measuring the following parameters: a. coke sulfur content b. coke graphitization
Claim 2
Dependent Claim
124 words
A process of producing electrode-grade carbon from green coke having a sulfur content higher than 3% by weight, said process comprising subjecting said coke to a desulfurizing calcination treatment under a reducing atmosphere at a temperature of 1,400° - 1,700° C. and within the temperature range at which the density of the coke decreases as the temperature increases, said treatment being conducted at least until the content of sulfur in the coke is reduced to 1.2% by weight, but at a sufficiently slow rate of coke crystallization to form open pores in the coke, thereby permitting sulfurized compounds to escape from the coke, controlling said process during said treatment by continuously sampling and measuring the following parameters: a. coke sulfur content b. coke graphitization
Claim 3
Dependent Claim
4 words
c. coke pore structure
Claim 4
Dependent Claim
4 words
c. coke pore structure
Claim 5
Dependent Claim
21 words
d. coke density, and adjusting operation conditions in response to said parameters to yield the desired properties of the resultant coke.
Claim 6
Dependent Claim
21 words
d. coke density, and adjusting operation conditions in response to said parameters to yield the desired properties of the resultant coke.
Claim 7
Dependent Claim
30 words
A process according to claim 1, wherein the sulfur content of the coke is determined by continuous measurement of flue gas output and of the composition of gaseous sulfurized products.
Claim 8
Dependent Claim
25 words
A process according to claim 1, wherein the measurement of the sulfur content of coke is determined by gamma or X-ray radiation on said samples.
Claim 9
Dependent Claim
46 words
A process according to claim 3, wherein the sulfur content of the coke is measured by activating coke powder with gamma rays from Americum 241 and detecting and measuring resultant fluorescence by amplified scintillation, the measuring accuracy being within 100 ppm of sulfur in the coke.
Claim 10
Dependent Claim
40 words
A process according to claim 1, wherein the coke structure is controlled continuously and in place by means of a couple of electric electrodes immersed in the bed of coke being treated and measuring the electric resistivity of said bed.
Claim 11
Dependent Claim
29 words
A process according to claim 1, wherein the coke structure is contolled by measurement by means of gamma or X-ray radiation passed through the bed of coke being formed.
Claim 12
Dependent Claim
38 words
A process according to claim 1, wherein the green coke is subjected before treatment to at least partial impregnation by a pitch rich in carbon and poor in sulfur, to create a reducing atmosphere during the desulfurizing calcination.
Claim 13
Dependent Claim
19 words
A process according to claim 7, wherein the pitch contains 8 - 24% by weight of carboid and asphaltene.
Claim 14
Dependent Claim
17 words
A process according to claim 1, wherein there is added to the green coke a graphitization accelerator.
Claim 15
Dependent Claim
18 words
A process according to claim 9, wherein said graphitization accelerator is C, Si, Al, Ni, Ca, or Ti.
Claim 16
Dependent Claim
20 words
A process according to claim 1, wherein the desulfurizing calcination is effected under a pressure of 1 to 7 atmospheres.
Claim 17
Dependent Claim
18 words
A process according to claim 1, wherein there is added to the green coke a graphitization slowing-down agent.
Claim 18
Dependent Claim
16 words
A process according to claims 12, wherein the slowing-down agent is S, Cr, Se, or Mo.
Claim 19
Dependent Claim
16 words
A process according to claim 1, wherein the treatment time is at least about 3 hours.
Claim 20
Dependent Claim
48 words
A process according to claim 1, said green coke prior to said desulfurizing calcination treatment having been impregnated at least partially with a pitch rich in carbon and poor in sulfur to create a reducing atmosphere during the desulfurizing calcination, said green coke further containing a graphitization accelerator.
References Cited (Backward Citations)
US3369871A
Cited
US3684446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |