US3895938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of mercury
Assignee: Bayer AG
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Filing: 1974-01-14
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Granted: 1975-07-22
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Expires: 1994-01-14
Abstract
Abstract In the electrolysis of an alkali metal chloride in a cell containing mercury there is produced an alkali metal amalgam which is withdrawn and decomposed to regenerate mercury containing impurities introduced from the alkali metal chloride. The impure mercury is mixed turbulently with an aqueous solution of sulfuric acid having mercury (I) sulfate dissolved or suspended therein whereupon the impurities are extracted into the solution and the purified mercury is recycled.
Inventors
- 👤 Helmut Klotz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:09
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/36; C22; C22B; C22B43/00; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
42 words
IN THE PURIFICATION OF MERCURY BY CONTACTING IT WITH AN AQUEOUS MEDIUM TO EXTRACT THE IMPURITIES INTO THE AQUEOUS MEDIUM THE IMPROVEMENT WHICH COMPRISES EMPLOYING AS SAID AQUEOUS MEDIUM A SOLUTION OF SULFURIC ACID HAVING MERCURY (I) SULFATE DISSOLVED OR SUSPENDED THEREIN.
Claim 2
Dependent Claim
42 words
IN THE PURIFICATION OF MERCURY BY CONTACTING IT WITH AN AQUEOUS MEDIUM TO EXTRACT THE IMPURITIES INTO THE AQUEOUS MEDIUM THE IMPROVEMENT WHICH COMPRISES EMPLOYING AS SAID AQUEOUS MEDIUM A SOLUTION OF SULFURIC ACID HAVING MERCURY (I) SULFATE DISSOLVED OR SUSPENDED THEREIN.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the temperature is about 10* to 120*C.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the sulfuric acid solution is about 0.05 to 5 molar.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the mercury is turbulently mixed with the sulfuric acid solution.
Claim 6
Dependent Claim
24 words
The process of claim 4 wherein the temperature is about 20* to 100*C and the sulfuric acid solution is about 0.1 to 1 molar.
Claim 7
Dependent Claim
39 words
The process of claim 5 wherein the impure mercury is obtained by decomposition of an amalgam formed during electrolysis of an alkali metal chloride in a cell containing mercury, and the purified mercury is thereafter returned to said cell.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |