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Patent US3115389A successfully refreshed from Google Patents.
US3115389A
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Treatment of brine
Assignee: Imperial Chemical Industries Ltd
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Filing: 1961-11-27
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Granted: 1963-12-24
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Expires: 1981-11-27
Abstract
No abstract record available.
Inventors
- 👤 Deriaz Marcel George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:34
CPC Classifications
C; C01; C01D; C01D3/00; C01D3/14; C01D3/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A PROCESS FOR THE SUBSTANTIAL REMOVAL OF MERCURY FROM THE BRINE EFFLUENT OF A MERCURY CATHODE ELECTROLYTIC CELL WHICH COMPRISES ADDING A SOLUBLE SULPHIDE WHICH SUPPLIES SULPHIDE IONS TO SAID BRINE EFFLUENT AT A PH LESS THAN 4 UNTIL THE REDOX POTENTIAL RELATIVE TO THE SATURATED KCLCALOMEL ELECTRODE IS IN THE RANGE +0.85 VOLT TO +0.93 VOLT, THEN RAISING THE PH BY THE ADDITION OF ALKALI TO A PH IN THE RANGE 7-9, THEREAFTER CONTINUING THE INTRODUCTION OF SULPHIDE IONS INTO SAID EFFLUENT AT SAID PH OF 7-9 UNTIL THE REDOX POTENTIAL IS IN THE RANGE 0 TO -0.2 VOLT, THE PRECIPITATE BEING THEN FLOCCULATED AND SETTLED AND THE SUBSTANTIALLY MERCURY-FREE BRINE SEPARATED.
Claim 2
Dependent Claim
113 words
A PROCESS FOR THE SUBSTANTIAL REMOVAL OF MERCURY FROM THE BRINE EFFLUENT OF A MERCURY CATHODE ELECTROLYTIC CELL WHICH COMPRISES ADDING A SOLUBLE SULPHIDE WHICH SUPPLIES SULPHIDE IONS TO SAID BRINE EFFLUENT AT A PH LESS THAN 4 UNTIL THE REDOX POTENTIAL RELATIVE TO THE SATURATED KCLCALOMEL ELECTRODE IS IN THE RANGE +0.85 VOLT TO +0.93 VOLT, THEN RAISING THE PH BY THE ADDITION OF ALKALI TO A PH IN THE RANGE 7-9, THEREAFTER CONTINUING THE INTRODUCTION OF SULPHIDE IONS INTO SAID EFFLUENT AT SAID PH OF 7-9 UNTIL THE REDOX POTENTIAL IS IN THE RANGE 0 TO -0.2 VOLT, THE PRECIPITATE BEING THEN FLOCCULATED AND SETTLED AND THE SUBSTANTIALLY MERCURY-FREE BRINE SEPARATED.
References Cited (Backward Citations)
GB506394A
Cited
US2860952A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-12-23 | 1967-06-24 | 1967-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-23 | 1971-06-24 | 1971-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-23 | 1975-06-24 | 1975-12-24 | $7700.00 | Window Closed / Lapsed |