US3899570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extraction of mercuric chloride from dilute solution and recovery
Assignee: Wisconsin Alumni Research Foundation
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Filing: 1973-02-09
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Granted: 1975-08-12
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Expires: 1993-02-09
Abstract
Abstract The removal and recovery of mercuric materials from dilute solutions by treating mercuric halide in aqueous solution with a solvent solution of a primary, secondary and preferably tertiary alkyl amine having from 6-18 carbon atoms in the alkyl groups, at a pH within the range of 0.5-3 to extract the mercury from the aqueous phase into the organic phase and then extracting the mercuric complex from the organic phase to an aqueous phase by treatment with an aqueous phase at a pH within the range of 913.
Inventors
- 👤 Thomas W Chapman
- 👤 Reinaldo Caban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:38
CPC Classifications
C; C22; C22B; C22B43/00; C01; C01G; C01G13/00; C01G13/04; C02; C02F; C02F1/00; C02F1/26
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
129 words
A method for removal and recovery of mercury from dilute solution in aqueous phase in the form of a halide comprising the steps of contacting the aqueous phase with an organic phase formed of a solvent solution of an alkyl amine selected from the group consisting of a primary, secondary and tertiary amine in which alkyl groups are C8 to C18 in the primary and secondary amines and C6 to C18 in the tertiary amine at a pH within the range of 0.5 to 3.0, separating the aqueous phase and the organic phase containing the mercuric moieties extracted from the aqueous phase, and contacting the separated organic phase with another aqueous phase at a pH above 9 to extract mercuric moieties from the organic phase into the aqueous phase.
Claim 2
Independent Claim
129 words
A method for removal and recovery of mercury from dilute solution in aqueous phase in the form of a halide comprising the steps of contacting the aqueous phase with an organic phase formed of a solvent solution of an alkyl amine selected from the group consisting of a primary, secondary and tertiary amine in which alkyl groups are C8 to C18 in the primary and secondary amines and C6 to C18 in the tertiary amine at a pH within the range of 0.5 to 3.0, separating the aqueous phase and the organic phase containing the mercuric moieties extracted from the aqueous phase, and contacting the separated organic phase with another aqueous phase at a pH above 9 to extract mercuric moieties from the organic phase into the aqueous phase.
Claim 3
Dependent Claim
50 words
A method as claimed in claim 1 in which in the first extraction of the aqueous phase with the organic phase, the ratio of organic phase to aqueous phase is less than 1, and in the second extraction, the ratio of aqueous phase to organic phase is greater than 10.
Claim 4
Dependent Claim
48 words
A method as claimed in claim 1 in which in the first extraction of the aqueous phase with the organic phase, the ratio of organic phase to aqueous phase is about 0.01, and in the second extraction, the ratio of aqueous phase to organic phase is about 100.
Claim 5
Dependent Claim
28 words
A method as claimed in claim 1 in which the alkyl amine is a tertiary amine in which the alkyl groups have from 6 to 18 carbon atoms.
Claim 6
Dependent Claim
28 words
A method as claimed in claim 1 in which the alkyl amine is a tertiary amine in which the alkyl groups have from 10 to 12 carbon atoms.
Claim 7
Dependent Claim
14 words
A method as claimed in claim 1 in which the alkyl amine is trioctylamine.
Claim 8
Dependent Claim
28 words
A method as claimed in claim 1 in which the alkyl amine is a secondary amine, the alkyl groups of which have from 8 to 18 carbon atoms.
Claim 9
Dependent Claim
25 words
A method as claimed in claim 1 in which the alkyl amine is present in the organic solvent phase in a concentration up to 0.1M.
Claim 10
Dependent Claim
42 words
A method as claimed in claim 1 in which the first extraction is carried out at a pH within the range of 1 to 2 and the second extraction is carried out at a pH within the range of 10 to 13.
Claim 11
Dependent Claim
16 words
A method as claimed in claim 1 in which the solvent is an aromatic organic solvent.
Claim 12
Dependent Claim
24 words
A method as claimed in claim 1 in which the solvent is selected from the group consisting of kerosene, benzene, xylene, toluene and naphthalene.
Claim 13
Independent Claim
138 words
A METHOD FOR THE EXTRACTION AND RECOVERY OF MERCURY FROM ITS ORES THE STEPS OF TREATING THE ORE WITH AN AQUEOUS OXIDIZING HALIDE SOLUTION FOR REMOVAL OF THE MERCURY AS THE SOLUBILIZED HALIDE, ACIDIFYING THE SOLUTION TO A PH WITHIN THE RANGE OF 0.5-3.0, CONTACTING THE ACIDIFIED AQUEOUS SOLUTION WITH AN ORGANIC PHASE FORMED OF AN ORGANIC SOLVENT SOLUTION OF AN ALKYL AMINE SELECTED FROM THE GROUP CONSISTING OF PRIMARY, SECONDARY AND TERTIARY AMINES IN WHICH ALKYL GROUPS ARE C8 TO C18 IN THE PRIMARY AND SECONDARY AMINES AND C6 TO C18 IN THE TERTIARY AMINE, SEPARATING THE ORGANIC PHASE FROM THE AQUEOUS PHASE, CONTACTING THE ORGANIC PHASE WITH AN AQUEOUS PHASE AT A PH ABOVE 9 TO EXTRACT THE SOLUBLE MERCURIC SALTS FROM THE ORGANIC PHASE AT SUFFICIENTLY HIGH CONCENTRATION FOR ECONOMIC REDUCTION TO THE METAL MERCURY.
Claim 14
Independent Claim
138 words
A METHOD FOR THE EXTRACTION AND RECOVERY OF MERCURY FROM ITS ORES THE STEPS OF TREATING THE ORE WITH AN AQUEOUS OXIDIZING HALIDE SOLUTION FOR REMOVAL OF THE MERCURY AS THE SOLUBILIZED HALIDE, ACIDIFYING THE SOLUTION TO A PH WITHIN THE RANGE OF 0.5-3.0, CONTACTING THE ACIDIFIED AQUEOUS SOLUTION WITH AN ORGANIC PHASE FORMED OF AN ORGANIC SOLVENT SOLUTION OF AN ALKYL AMINE SELECTED FROM THE GROUP CONSISTING OF PRIMARY, SECONDARY AND TERTIARY AMINES IN WHICH ALKYL GROUPS ARE C8 TO C18 IN THE PRIMARY AND SECONDARY AMINES AND C6 TO C18 IN THE TERTIARY AMINE, SEPARATING THE ORGANIC PHASE FROM THE AQUEOUS PHASE, CONTACTING THE ORGANIC PHASE WITH AN AQUEOUS PHASE AT A PH ABOVE 9 TO EXTRACT THE SOLUBLE MERCURIC SALTS FROM THE ORGANIC PHASE AT SUFFICIENTLY HIGH CONCENTRATION FOR ECONOMIC REDUCTION TO THE METAL MERCURY.
Claim 15
Dependent Claim
16 words
The method as claimed in claim 12 in which the oxidizing halide solution is sodium hypochlorite.
Claim 16
Dependent Claim
18 words
The method as claimed in claim 12 in which the oxidizing halide solution is an oxidizing chloride solution.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |