Patent US3873667A successfully refreshed from Google Patents.
Patent US2943910A successfully refreshed from Google Patents.
US2943910A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing hydrogen sulfide from gaseous mixtures
Assignee: Vetrocoke SpA
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Filing: 1956-06-29
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Granted: 1960-07-05
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Expires: 1976-06-29
Abstract
No abstract record available.
Inventors
- 👤 Giammarco Giuseppe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:01
CPC Classifications
C; C10; C10K; C10K1/00; C10K1/08; C10K1/10; C10K1/12; C10K1/124; C10K1/126; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/52; B01D53/526; C01; C01B; C01B17/00; C01B17/02; C01B17/04; C01B17/05; C01B17/06; C01B32/00; C01B32/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
A METHOD OF REMOVING HYDROGEN SULPHIDE FROM A GASEOUS MIXTURE BY THE USE OF A SCRUBBING LIQUID COMPRISING THE STEPS OF INTRODUCING THE GASEOUS MIXTURE INTO AN ABSORPTION AND DIGESTION ZONE, CONTACTING SAID GASEOUS MIXTURE IN THE SAID ZONE SITH SAID SCRUBBING LIQUID COMPRISING AN AQUEOUS SOLUTION CONTAINING AN ALKALINE ARSENITE CAPABLE OF REACTING WITH THE HYDROGEN SULPHIDE TO FORM A THIOARSENITE, AND CONTAINING AN ALKALINE ARSENATE IN THE PROPORTION OF AT LEAST THREE MOLES OF ARSENATE PER MOLE OF THIOARSENITE, WHEREBY THE THIOARSENITE IS CONVERTED TO ARSENITE, AND ARSENATE IS CONVERTED TO MONTHIOARSENATE, TRANSFERRING THE MONOTHIOARSENATE-CONTAINING SOLUTION FROM SAID ABSORPTION AND DIGESTION ZONE TO AN ACIDIFICATION ZONE AND REDUCING ITS ALKALINITY IN SAID LASTNAMED ZONE, WHEREBY MONOTHIAORSENATE IS CONVERTED TO ARSENTE AND SULPHUR IN ELEMENTAL STATE IS PRECIPATED, SEPARATING AND RECOVERING THE ELEMENTAL SULPHUR, CONVEYING THE SOLUTION FROM THE ACIDIFICATION ZONE TO AN OXIDATION ZONE IN WHICH PART OF ITS ARSENITE CONTENT IS OXIDIZED TO REFORM THE ARSENATE CONSUMED IN THE ABSORPTION AND DIGESTION ZONE, AND RETURNING THE SOLUTION FROM THE OXIDATION ZONE TO THE ABSORPTION AND DIGESTION ZONE.
Claim 2
Independent Claim
180 words
A METHOD OF REMOVING HYDROGEN SULPHIDE FROM A GASEOUS MIXTURE BY THE USE OF A SCRUBBING LIQUID COMPRISING THE STEPS OF INTRODUCING THE GASEOUS MIXTURE INTO AN ABSORPTION AND DIGESTION ZONE, CONTACTING SAID GASEOUS MIXTURE IN THE SAID ZONE SITH SAID SCRUBBING LIQUID COMPRISING AN AQUEOUS SOLUTION CONTAINING AN ALKALINE ARSENITE CAPABLE OF REACTING WITH THE HYDROGEN SULPHIDE TO FORM A THIOARSENITE, AND CONTAINING AN ALKALINE ARSENATE IN THE PROPORTION OF AT LEAST THREE MOLES OF ARSENATE PER MOLE OF THIOARSENITE, WHEREBY THE THIOARSENITE IS CONVERTED TO ARSENITE, AND ARSENATE IS CONVERTED TO MONTHIOARSENATE, TRANSFERRING THE MONOTHIOARSENATE-CONTAINING SOLUTION FROM SAID ABSORPTION AND DIGESTION ZONE TO AN ACIDIFICATION ZONE AND REDUCING ITS ALKALINITY IN SAID LASTNAMED ZONE, WHEREBY MONOTHIAORSENATE IS CONVERTED TO ARSENTE AND SULPHUR IN ELEMENTAL STATE IS PRECIPATED, SEPARATING AND RECOVERING THE ELEMENTAL SULPHUR, CONVEYING THE SOLUTION FROM THE ACIDIFICATION ZONE TO AN OXIDATION ZONE IN WHICH PART OF ITS ARSENITE CONTENT IS OXIDIZED TO REFORM THE ARSENATE CONSUMED IN THE ABSORPTION AND DIGESTION ZONE, AND RETURNING THE SOLUTION FROM THE OXIDATION ZONE TO THE ABSORPTION AND DIGESTION ZONE.
References Cited (Backward Citations)
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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) | 1963-07-05 | 1964-01-04 | 1964-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-05 | 1968-01-04 | 1968-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-05 | 1972-01-04 | 1972-07-05 | $7700.00 | Window Closed / Lapsed |