US3821110A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sour water purification process
Assignee: Marathon Oil Co
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Filing: 1971-08-11
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Granted: 1974-06-28
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Expires: 1991-08-11
Abstract
Abstract Sulfidic water containing H2S and NH3, or alkali metal or other cations forming water soluble sulfides, is mixed with water containing salts of such cations and possibly excess SO2, then sent to an H2S stripper for treatment with air to produce a sulfide-depleted liquid effluent. H2S evolved from the stripper is burned to form SO2 which is absorbed in an SO2 absorber. A portion of the liquid effluent from the H2S stripper is used as solvent in the SO2 absorber which forms additional water containing ammonium and possibly excess SO2 salts for mixing with additional sour water.
Inventors
- 👤 W Luetzelschwab
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:20
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/58; C02F1/586; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/507; C02F1/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
22 words
A process according to claim 1 wherein said sulfidic water contains from about 100 to about 100,000 parts per million of sulfides.
Claim 2
Dependent Claim
39 words
A process according to claim 1 wherein the sulfidic water contains from 5 to about 200,000 parts per million of ions selected from the group consisting of ammonia, alkali metal ions, or other ions which form water soluble sulfides.
Claim 3
Dependent Claim
25 words
A process according to claim 3 wherein said ions are selected from the group consisting of ammonia, alkali metals, tungsten, thallium, rubidium, strontium, and cesium.
Claim 4
Dependent Claim
26 words
A process according to claim 1 wherein said aqueous solutions containing salts comprising sulfites, bisulfites, sulfates, or bisulfates of said ions, also contain free sulfur dioxide.
Claim 5
Dependent Claim
149 words
A process for the purification of sour water polluted with hydrogen sulfide and ammonia in the form of sulfides of ammonia comprising; a. mixing said sour water with an aqueous solution comprising bisulfites to form a mixed stream, b. contacting the mixed stream with air in an H2S stripping zone to evolve a gaseous stream comprising H2S and oxygen and a stripped liquid effluent depleted in sulfides, c. burning at least a portion of the H2S evolved from the stripping zone to form SO2, d. contacting at least a portion of the SO2 formed by burning of the H2S with diluent selected from the group consisting of additional water and the stripped effluent from the H2S stripping zone in an SO2 adsorption zone to form aqueous solutions comprising ammonia bisulfite, e. recycling at least a portion of said aqueous solution containing ammonium bisulfite for contacting with said sour water.
Claim 6
Dependent Claim
144 words
A process for the purification of sulfidic water polluted with hydrogen sulfide and sodium in the form of sulfides of sodium comprising; a. mixing said sulfidic water with an aqueous solution comprising bisulfites to form a mixed stream, b. contacting the mixed stream with air in an H2S stripping zone to evolve a gaseous stream comprising H2S and oxygen and a stripped liquid effluent depleted in sulfides, c. burning at least a portion of the H2S evolved from the stripping zone to form SO2, d. contacting at least a portion of the SO2 formed by burning of the H2S with at least a portion of the stripped effluent from the H2S stripping zone in an SO2 adsorption zone to form aqueous solutions comprising sodium bisulfite, e. recycling at least a portion of said aqueous solution containing sodium bisulfite for contacting with said sulfidic water.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |