US4521301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of production of organic dithio-acids and their application
Assignee: Societe Nationale Elf Aquitaine Production SA
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Filing: 1984-03-05
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Granted: 1985-06-04
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Expires: 2004-03-05
Abstract
Abstract Process for the preparation of an organic dithio-acid by reaction of the corresponding dithio-ester and an alkali metal or alkaline earth metal hydrosulphide in a solvent in the presence of an excess of H2S and treatment with a mineral acid. The dithioic acids so obtained can be utilized as collectors for the flotation of minerals.
Inventors
- 👤 Jean-Louis Detienne
- 👤 Guy Levesque
- 👤 Pierre Tozzolino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:44
CPC Classifications
C; C07; C07C; C07C327/00; B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/012; B03D2201/00; B03D2201/02; B03D2203/00; B03D2203/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
In a process of using a sulphur-containing material as a collector in the flotation of a mineral selected from the group consisting of galena, chalcopyrite and blende, the improvement which comprises employing as the collector a dithioic acid of the formula RCS.sub.2 H in which R is alkyl or alkenyl, linear or branched, of 4 to 20 carbon atoms which does not contain sulphur, or the sodium, potassium or ammonium salts thereof.
Claim 2
Dependent Claim
72 words
In a process of using a sulphur-containing material as a collector in the flotation of a mineral selected from the group consisting of galena, chalcopyrite and blende, the improvement which comprises employing as the collector a dithioic acid of the formula RCS.sub.2 H in which R is alkyl or alkenyl, linear or branched, of 4 to 20 carbon atoms which does not contain sulphur, or the sodium, potassium or ammonium salts thereof.
Claim 3
Dependent Claim
14 words
The process of claim 1 in which R contains 6 to 18 carbon atoms.
Claim 4
Dependent Claim
29 words
The process of claim 1 in which the dithioic acid is selected from the group consisting of dithiomyristic, dithiopalmitic, dithiooleic acid and the sodium, potassium or ammonium salts thereof.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the dithioacid is dithiopentanoic acid or the sodium, potassium or ammonium salt thereof.
Claim 6
Dependent Claim
21 words
The process of claim 1 in which the dithioic acid is dithiocapoic acid or the sodium, potassium or ammonium salt thereof.
Claim 7
Dependent Claim
19 words
The process of claim 1 wherein the dithioacid is dithiolauric acid or the sodium, potassium or ammonium salt thereof.
References Cited (Backward Citations)
SU275915A1
Cited
US1788331A
Cited
US2844584A
Cited
FR2337199A1
Cited
US4235709A
Cited
US4274950A
Cited
US4324654A
Cited
FR2458319A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |