US3322492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Kraft black liquor recovery
Assignee: Arthur D Little Inc
•
Filing: 1964-07-31
•
Granted: 1967-05-30
•
Expires: 1984-07-31
Abstract
No abstract record available.
Inventors
- 👤 Flood Harold William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:46
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/12; Y; Y10; Y10S; Y10S159/00; Y10S159/03; Y10S423/00; Y10S423/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A PROCESS FOR THE TREATMENT OF KRAFT BLACK LIQUOR TO RECOVER VALUES THEREFROM, COMPRISING THE STEPS OF FEEDING SAID LIQUOR TO A DRYING AND REACTING ZONE, SUBJECTING SAID LIQUOR IN SAID ZONE TO THE ACTION OF FLUIDIZING DRYING GAS CONTAINING SULFUR DIOXIDE, UNDER THE CONDITIONS OF A FLUID BED, TO PROVDE A PARTICULATE DRY PRODUCT CONSISTING ESSENTIALLY OF SODIUM SULFATE, SODIUM CARBONATE AND ORGANIC MATERIAL, CONVEYING SAID DRY PRODUCT INTO A REDUCING ZONE, SUBJECTING SAID PRODUCT, WHILE IN SAID ZONE, TO FLUIDIZING CONDITIONS AND TO HEAT SUFFICIENT TO DECOMPOSE SAID ORGANIC MATERIAL AND REDUCE THE SODIUM SULFATE TO SODIUM SULFIDE, TOGETHER WITH THE PRODUCTION OF SOME HYDROGEN SULFIDE BUT WITHOUT SUBSTANTIAL EFFECT ON THE SODIUM CARBONATE, AND REMOVING SAID HYDROGEN SULFIDE FROM SAID SECOND ZONE AND OXIDIZING IT TO PRODUCE THE AFOREMENTIONED SULFUR DIOXIDE.
Claim 2
Dependent Claim
134 words
A PROCESS FOR THE TREATMENT OF KRAFT BLACK LIQUOR TO RECOVER VALUES THEREFROM, COMPRISING THE STEPS OF FEEDING SAID LIQUOR TO A DRYING AND REACTING ZONE, SUBJECTING SAID LIQUOR IN SAID ZONE TO THE ACTION OF FLUIDIZING DRYING GAS CONTAINING SULFUR DIOXIDE, UNDER THE CONDITIONS OF A FLUID BED, TO PROVDE A PARTICULATE DRY PRODUCT CONSISTING ESSENTIALLY OF SODIUM SULFATE, SODIUM CARBONATE AND ORGANIC MATERIAL, CONVEYING SAID DRY PRODUCT INTO A REDUCING ZONE, SUBJECTING SAID PRODUCT, WHILE IN SAID ZONE, TO FLUIDIZING CONDITIONS AND TO HEAT SUFFICIENT TO DECOMPOSE SAID ORGANIC MATERIAL AND REDUCE THE SODIUM SULFATE TO SODIUM SULFIDE, TOGETHER WITH THE PRODUCTION OF SOME HYDROGEN SULFIDE BUT WITHOUT SUBSTANTIAL EFFECT ON THE SODIUM CARBONATE, AND REMOVING SAID HYDROGEN SULFIDE FROM SAID SECOND ZONE AND OXIDIZING IT TO PRODUCE THE AFOREMENTIONED SULFUR DIOXIDE.
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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) | 1970-05-29 | 1970-11-28 | 1971-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-29 | 1974-11-28 | 1975-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-29 | 1978-11-28 | 1979-05-30 | $7700.00 | Window Closed / Lapsed |