US3723291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for desulfurizing coke
Assignee: ConocoPhillips Co
•
Filing: 1971-04-16
•
Granted: 1973-03-27
•
Expires: 1991-04-16
Abstract
Abstract Petroleum coke of reduced sulfur content is produced by adding an alkali metal carbonate (preferably sodium carbonate) to the coker feedstock prior to coking and then, after coking, treating the coke with hydrogen at an elevated temperature.
Inventors
- 👤 M Thakker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:06
CPC Classifications
C; C10; C10B; C10B57/00; C10B57/04; C10B57/06; C10L; C10L9/00; C10L9/02; C10L9/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
20 words
The process of claim 1 wherein the coke is subjected to grinding to produce a suitable particle size for hydrogenation.
Claim 2
Dependent Claim
20 words
The process of claim 2 wherein the coke is reduced to particle size of less than 12 U.S. Standard mesh.
Claim 3
Dependent Claim
22 words
The process of claim 3 wherein the coke is heated at a temperature in the range of about 1,100* to about 1,600*F.
Claim 4
Dependent Claim
18 words
The process of claim 4 wherein the coke is washed with water after it is treated with hydrogen.
Claim 5
Dependent Claim
13 words
The process of claim 5 wherein the alkali metal carbonate is sodium carbonate.
Claim 6
Dependent Claim
22 words
The process of claim 6 wherein the temperature of treating with Hydrogen is in the range of about 1,100*F to about 1,400*F.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |