Patent US3933596A successfully refreshed from Google Patents.
US3933596A
Expired / Lapsed
US
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Desulfurization of coke
Assignee: Lummus Technology LLC
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Filing: 1974-04-01
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Granted: 1976-01-20
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Expires: 1994-04-01
Abstract
Abstract Coke is desulfurized by calcining coke at a temperature of 1600° - 2200° F. in admixture with sodium carbonate, followed by direct contact with phosgene or a mixture of carbon monoxide and chlorine at a temperature of 1200° - 1800° F. to produce coke having sulfur contents of less than 0.5 percent.
Inventors
- 👤 Raymond H. Long
- 👤 Morgan C. Sze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 11:23
CPC Classifications
C; C10; C10L; C10L9/00; C10L9/02; C10B; C10B57/00; C10B57/005; C10L9/10
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
100 words
A process for desulfurizing coke, comprising: a. heating coke in admixture with a desulfurizing amount of sodium carbonate at a coke temperature of from about 1600°F. to about 2400°F. for a period of at least 0.5 hour to calcine the coke, and b. thereafter contacting the coke from step (a) with a desulfurizing gas comprising a member selected from the group consisting of phosgene and a mixture of carbon monoxide and chlorine, said contacting being effected at a coke temperature from about 1200°F. to about 1800°F. to produce a coke with a sulfur content of no greater than 0.85 percent.
Claim 2
Dependent Claim
100 words
A process for desulfurizing coke, comprising: a. heating coke in admixture with a desulfurizing amount of sodium carbonate at a coke temperature of from about 1600°F. to about 2400°F. for a period of at least 0.5 hour to calcine the coke, and b. thereafter contacting the coke from step (a) with a desulfurizing gas comprising a member selected from the group consisting of phosgene and a mixture of carbon monoxide and chlorine, said contacting being effected at a coke temperature from about 1200°F. to about 1800°F. to produce a coke with a sulfur content of no greater than 0.85 percent.
Claim 3
Dependent Claim
23 words
The process of claim 15 wherein said sodium carbonate is present in an amount from about 0.5 to about 5 percent, by weight.
Claim 4
Dependent Claim
18 words
The process of claim 2 wherein the contacting of step (b) is effected for at least 0.5 hours.
Claim 5
Dependent Claim
53 words
The process of claim 3 wherein the coke is a fluid coke, said fluid coke being mixed with the sodium carbonate prior to said heating, said fluid coke which is mixed with the sodium carbonate having a particle size of 100 percent minus 100 mesh and at least 50 percent minus 325 mesh.
Claim 6
Dependent Claim
20 words
The process of claim 4 wherein the mixture of fluid coke and sodium carbonate is pelletized prior to said heating.
Claim 7
Dependent Claim
17 words
The process of claim 5 wherein the desulfurizing gas comprises a mixture of carbon monoxide and chlorine.
Claim 8
Dependent Claim
23 words
The process of claim 6 wherein the heating of step (a) is effected at a coke temperature from about 2000°F. to about 2300°F.
Claim 9
Dependent Claim
21 words
The process of claim 7 wherein the contacting step (b) is effected at a temperature from about 1400°F. to about 1800°F.
Claim 10
Dependent Claim
53 words
The process of claim 3 wherein the coke is a delayed coke, said delayed coke being mixed with the sodium carbonate prior to said heating, said delayed coke which is mixed with the sodium carbonate, having a particle size of 100 percent minus 16 mesh and at least 30 percent minus 200 mesh.
Claim 11
Dependent Claim
20 words
The process of claim 9 wherein the mixture of delayed coke and sodium carbonate is pelletized prior to said heating.
Claim 12
Dependent Claim
17 words
The process of claim 10 wherein the desulfurizing gas comprises a mixture of carbon monoxide and chlorine.
Claim 13
Dependent Claim
23 words
The process of claim 11 wherein the heating of step (a) is effected at a coke temperature from about 2000°F. to about 2300°F.
Claim 14
Dependent Claim
22 words
The process of claim 12 wherein the contacting of step (b) is effected at a temperature from about 1400°F. to about 1800°F.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |