US2706736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production and separation of sulphonated organic compounds
Assignee: BP PLC
•
Filing: 1950-01-26
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Granted: 1955-04-19
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Expires: 1970-01-26
Abstract
No abstract record available.
Inventors
- 👤 Birch Stanley Francis
- 👤 Nathan Wilfred Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:42
CPC Classifications
C; C07; C07C; C07C303/00; C07C303/02; C07C303/04; C07C303/06; C07C303/42; C07C303/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A PROCESS FOR THE SEPARATION OF SULPHUR DIOXIDE FROM A SULPHONIC ACID OBTAINED BY REACTING AN AROMATIC COMPOUND WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF OLEUM AND SULFUR TRIOXIDE, IN THE PRESENCE OF LIQUID SULPHUR DIOXIDE AS SOLVENT, WHICH COMPRISES ADDING TO THE SULPHONIC ACID SOLUTION, A VOLATILE SATURATED ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF PARAFFIN HYDROCARBONS HAVING FROM 3 TO 8 CARBON ATOMS PER MOLECULE, NAPHTHENES HAVING FROM 5 TO 8 CARBON ATOMS PER MOLECULE, ALIPHATIC ETHERS HAVING FROM 2 TO 4 CARBON ATOMS PER MOLECULE, CYCLIC ETHERS, CHLOROFORM, ETHYLENE DICHLORIDE, CARBON TETRACHLORIDE AND METHYLENE DICHLORIDE, CHEMICALLY INERT UNDER THE DISTILLATION CONDITIONS, AND WHICH IS A MOBILE LIQUID AT -10* C., AND DISTILLING THE MIXTURE AT SUB-ATMOSPHERIC PRESSURE TO TAKE OVERHEAD SUBSTANTIALLY ALL OF THE LIQUID SULPHUR DIOXIDE AND AT LEAST SOME OF THE ADDED ORGANIC COMPOUND.
Claim 2
Dependent Claim
142 words
A PROCESS FOR THE SEPARATION OF SULPHUR DIOXIDE FROM A SULPHONIC ACID OBTAINED BY REACTING AN AROMATIC COMPOUND WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF OLEUM AND SULFUR TRIOXIDE, IN THE PRESENCE OF LIQUID SULPHUR DIOXIDE AS SOLVENT, WHICH COMPRISES ADDING TO THE SULPHONIC ACID SOLUTION, A VOLATILE SATURATED ORGANIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF PARAFFIN HYDROCARBONS HAVING FROM 3 TO 8 CARBON ATOMS PER MOLECULE, NAPHTHENES HAVING FROM 5 TO 8 CARBON ATOMS PER MOLECULE, ALIPHATIC ETHERS HAVING FROM 2 TO 4 CARBON ATOMS PER MOLECULE, CYCLIC ETHERS, CHLOROFORM, ETHYLENE DICHLORIDE, CARBON TETRACHLORIDE AND METHYLENE DICHLORIDE, CHEMICALLY INERT UNDER THE DISTILLATION CONDITIONS, AND WHICH IS A MOBILE LIQUID AT -10* C., AND DISTILLING THE MIXTURE AT SUB-ATMOSPHERIC PRESSURE TO TAKE OVERHEAD SUBSTANTIALLY ALL OF THE LIQUID SULPHUR DIOXIDE AND AT LEAST SOME OF THE ADDED ORGANIC COMPOUND.
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) | 1958-04-18 | 1958-10-18 | 1959-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-18 | 1962-10-18 | 1963-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-18 | 1966-10-18 | 1967-04-19 | $7700.00 | Window Closed / Lapsed |