US2611682A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods of recovering hydrogen sulfide from sulfide containing soda liquors obtainedin cellulose production
Assignee: Individual
•
Filing: 1950-12-04
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Granted: 1952-09-23
•
Expires: 1970-12-04
Abstract
No abstract record available.
Inventors
- 👤 Mannbro Nils Viktor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:20
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/16; C01B17/165
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A METHOD OF RECOVERING HYDROGEN SULFIDE FROM A SODIUM SULFIDE AND SODIUM CARBONATE CONTAINING SOLUTION OF SODA SMELT RESULTING FROM THE REGENERATION OF SODIUM CONTAINING CELLULOSE WASTE LIQUORS, WHICH COMPRISES PASSING THE SOLUTION AND A CARBON DIOXIDE CONTAINING GAS IN COUNTERFLOW THROUGH AN ABSORPTION TOWER AND ADJUSTING THE RATIO OF THE AMOUNT OF CARBON DIOXIDE CONTAINING GAS INTRODUCED TO THE AMOUNT OF SOLUTION INTRODUCED IN SUCH MANNER THAT HYDROGEN SULFIDE LIBERATED IN THE LOWER PART OF THE TOWER IS REABSORBED IN THE TOP PART OF THE TOWER BY THE SODIUM CARBONATE OF THE FRESHLY INTRODUCED SOLUTION, WITHDRAWING A GAS MIXTURE SUBSTANTIALLY FREE FROM BOTH CARBON DIOXIDE AND HYDROGEN SULFIDE AT THE TOP OF THE TOWER, WITHDRAWING AT THE BOTTOM OF THE TOWER AN ACIDIFIED LIQUOR CONTAINING SUBSTANTIALLY THE TOTAL AMOUNT OF SULFUR OF THE SOLUTION INTRODUCED, AND RECOVERING HYDROGEN SULFIDE FROM SAID ACIDIFIED LIQUOR IN A SUBSEQUENT STEP.
Claim 2
Independent Claim
148 words
A METHOD OF RECOVERING HYDROGEN SULFIDE FROM A SODIUM SULFIDE AND SODIUM CARBONATE CONTAINING SOLUTION OF SODA SMELT RESULTING FROM THE REGENERATION OF SODIUM CONTAINING CELLULOSE WASTE LIQUORS, WHICH COMPRISES PASSING THE SOLUTION AND A CARBON DIOXIDE CONTAINING GAS IN COUNTERFLOW THROUGH AN ABSORPTION TOWER AND ADJUSTING THE RATIO OF THE AMOUNT OF CARBON DIOXIDE CONTAINING GAS INTRODUCED TO THE AMOUNT OF SOLUTION INTRODUCED IN SUCH MANNER THAT HYDROGEN SULFIDE LIBERATED IN THE LOWER PART OF THE TOWER IS REABSORBED IN THE TOP PART OF THE TOWER BY THE SODIUM CARBONATE OF THE FRESHLY INTRODUCED SOLUTION, WITHDRAWING A GAS MIXTURE SUBSTANTIALLY FREE FROM BOTH CARBON DIOXIDE AND HYDROGEN SULFIDE AT THE TOP OF THE TOWER, WITHDRAWING AT THE BOTTOM OF THE TOWER AN ACIDIFIED LIQUOR CONTAINING SUBSTANTIALLY THE TOTAL AMOUNT OF SULFUR OF THE SOLUTION INTRODUCED, AND RECOVERING HYDROGEN SULFIDE FROM SAID ACIDIFIED LIQUOR IN A SUBSEQUENT STEP.
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) | 1955-09-23 | 1956-03-24 | 1956-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-09-23 | 1960-03-24 | 1960-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-09-23 | 1964-03-24 | 1964-09-23 | $7700.00 | Window Closed / Lapsed |