US3275693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing organic sulfides
Assignee: Societe Nationale des Petroles dAquitaine SA
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Filing: 1963-01-25
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Granted: 1966-09-27
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Expires: 1983-01-25
Abstract
No abstract record available.
Inventors
- 👤 Pierre A Bapseres
- 👤 Biensan Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:39
CPC Classifications
C; C07; C07C; C07C319/00; C07C319/22; C07C319/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
75 words
A PROCESS FOR THE PREPARATION OF AN ORGANIC DISULFIDE SELECTED FROM THE GROUP CONSISTING OF DIMETHYL-, DIETHYL-, DIPROPYL-, DIBUTYL-, DI-ISOBUTYL-, DIPHENYL-, AND DICYCLOHEXYL-DISULFIDE, WHICH COMPRISES REACTING SULFUR, A MERCAPTAN SELECTED FROM THE GROUP CONSISTING OF METHYL-, ETHYL-, PROPYL-, BUTYL-, ISOBUTYL-, PHENYL- AND CYCLOHEXYLMERCAPTAN AND AN ALKALI METAL HYDROXIDE IN AN AQUEOUS SOLUTION, IN THE PROPORTION OF 0.5 GRAM EQIVALENT OF SAID ALKALI METAL HYDROXIDE AND 0.5 GRAM ATOM OF SULFUR PER MOLE OF SAID MERCAPTAN.
Claim 2
Dependent Claim
75 words
A PROCESS FOR THE PREPARATION OF AN ORGANIC DISULFIDE SELECTED FROM THE GROUP CONSISTING OF DIMETHYL-, DIETHYL-, DIPROPYL-, DIBUTYL-, DI-ISOBUTYL-, DIPHENYL-, AND DICYCLOHEXYL-DISULFIDE, WHICH COMPRISES REACTING SULFUR, A MERCAPTAN SELECTED FROM THE GROUP CONSISTING OF METHYL-, ETHYL-, PROPYL-, BUTYL-, ISOBUTYL-, PHENYL- AND CYCLOHEXYLMERCAPTAN AND AN ALKALI METAL HYDROXIDE IN AN AQUEOUS SOLUTION, IN THE PROPORTION OF 0.5 GRAM EQIVALENT OF SAID ALKALI METAL HYDROXIDE AND 0.5 GRAM ATOM OF SULFUR PER MOLE OF SAID MERCAPTAN.
Claim 3
Dependent Claim
127 words
A CYLIC PROCESS FOR THE PRODUCTION OF DIMETHYLDISULFIDE, WHICH COMPRISES: (A) REACTING SULFUR METHYLMERCAPTAN AND SODIUM HYDROXIDE IN AN AQUEOUS SOLUTION, IN THE PROPORTIN OF 0.5 GRAM ATOMS OF SULFUR AND 0.5 GRAM EQUIVALENT OF SODIUM HYDROXIDE PER MOLE OF METHYLMERCAPTAN, AT TEMPERATURES WITHIN THE RANGE OF FROM 5* TO 30*C. AND UNDER PRESSURES OF FROM 1 TO 10 ATMOSPHERES; (B) SEPARATING THE RESULTING ORGANIC LIQUID LAYER CONTAINING DIMETHYL-DISULFIDE FROM SAID AQUEOUS SOLUTION; (C) ADDING SODIUM HYDROXIDE TO THE RESIDUAL AQUEOUS SOLUTION CONTAINING SODIUM HYDROSULFIDE TO CONVERT THE SAME TO SODIUM SULFIDE; (D) CRYSTALLIZING SODIUM SULFIDE FROM SAID AQUEOUS SOLUTION AND SEPARATING THE RESIDUAL MOTHER LIQUOR THEREFROM; (E) DISSOLVING SULFUR IN SAID MOTHER LIQUOR AND RECYCLING THE RESULTING SULFUR-CONTAINING AQUEOUS SOLUTION TO STEP (A) FOR FURTHER REACTION.
Claim 4
Dependent Claim
127 words
A CYLIC PROCESS FOR THE PRODUCTION OF DIMETHYLDISULFIDE, WHICH COMPRISES: (A) REACTING SULFUR METHYLMERCAPTAN AND SODIUM HYDROXIDE IN AN AQUEOUS SOLUTION, IN THE PROPORTIN OF 0.5 GRAM ATOMS OF SULFUR AND 0.5 GRAM EQUIVALENT OF SODIUM HYDROXIDE PER MOLE OF METHYLMERCAPTAN, AT TEMPERATURES WITHIN THE RANGE OF FROM 5* TO 30*C. AND UNDER PRESSURES OF FROM 1 TO 10 ATMOSPHERES; (B) SEPARATING THE RESULTING ORGANIC LIQUID LAYER CONTAINING DIMETHYL-DISULFIDE FROM SAID AQUEOUS SOLUTION; (C) ADDING SODIUM HYDROXIDE TO THE RESIDUAL AQUEOUS SOLUTION CONTAINING SODIUM HYDROSULFIDE TO CONVERT THE SAME TO SODIUM SULFIDE; (D) CRYSTALLIZING SODIUM SULFIDE FROM SAID AQUEOUS SOLUTION AND SEPARATING THE RESIDUAL MOTHER LIQUOR THEREFROM; (E) DISSOLVING SULFUR IN SAID MOTHER LIQUOR AND RECYCLING THE RESULTING SULFUR-CONTAINING AQUEOUS SOLUTION TO STEP (A) FOR FURTHER REACTION.
References Cited (Backward Citations)
US2237625A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |