US3071615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for partially dehalogenating di-and trihaloacetic acid
Assignee: Knapsack AG
•
Filing: 1959-07-17
•
Granted: 1963-01-01
•
Expires: 1979-07-17
Abstract
No abstract record available.
Inventors
- 👤 Opitz Wolfgang
- 👤 Sennewald Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:52
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/347; C07C51/373
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
186 words
A PROCESS FOR PARTIALLY DEHALOGENATING HALOGENOACETIC ACIDS SELECTED FROM THE GROUP CONSISTING OF CHLOROACETIC ACIDS AND BROMOACETIC ACIDS CONTAINING MORE THAN ONE HALOGEN ATOM PER MOLECULE OF ACETIC ACID BY HYDROGENATION, WHICH COMPRISES PASSING A SOLUTION CONSISTING OF ACETIC ACID AND ONE SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF DICHLOROACETIC ACID, TRICHLOROACETIC ACID, A MIXTURE OF MONO-, DI AND TRICHLOROACETIC ACID, DIBROMOACETIC ACID AND A MIXTURE OF MONO- AND DIBROMOACETIC ACID INTO CONTACT WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND A MIXTURE OF HYDROGEN AND A CARRIER GAS HEATED TO A TEMPERATURE WITHIN THE RANGE OF 120* TO 140*C., INTRODUCING THE VAPORS AND GASES FORMED FROM THIS CONTACT INTO CONTACT WITH A CATALYST SELECTED FROM THE GROUP CONSISTING OF THE METALS OF THE PLATINUM GROUP AT A TEMPERATURE OF ABOUT 60* TO ABOUT 150*C. WHEREBY THE VAPOROUS HALOGENO-ACETIC ACIDS ARE PARTIALLY DEHALOGENATED TO FORM THE DEHALOGENATED HALOGENOACETIC ACID AND HYDROGEN CHLORIDE, CONDENSING THE HALOGENOACETIC ACID, ABSORBING THE HYDROGEN CHLORIDE WITH WATER, COMBINING THE RESIDUAL UNREACTED HYDROGEN WITH FRESH HYDROGEN, AND RECYCLING THE COMBINED HYDROGEN TO THE HYDROGEN CONTACT POINT WITH SAID SOLUTION.
Claim 2
Dependent Claim
186 words
A PROCESS FOR PARTIALLY DEHALOGENATING HALOGENOACETIC ACIDS SELECTED FROM THE GROUP CONSISTING OF CHLOROACETIC ACIDS AND BROMOACETIC ACIDS CONTAINING MORE THAN ONE HALOGEN ATOM PER MOLECULE OF ACETIC ACID BY HYDROGENATION, WHICH COMPRISES PASSING A SOLUTION CONSISTING OF ACETIC ACID AND ONE SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF DICHLOROACETIC ACID, TRICHLOROACETIC ACID, A MIXTURE OF MONO-, DI AND TRICHLOROACETIC ACID, DIBROMOACETIC ACID AND A MIXTURE OF MONO- AND DIBROMOACETIC ACID INTO CONTACT WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND A MIXTURE OF HYDROGEN AND A CARRIER GAS HEATED TO A TEMPERATURE WITHIN THE RANGE OF 120* TO 140*C., INTRODUCING THE VAPORS AND GASES FORMED FROM THIS CONTACT INTO CONTACT WITH A CATALYST SELECTED FROM THE GROUP CONSISTING OF THE METALS OF THE PLATINUM GROUP AT A TEMPERATURE OF ABOUT 60* TO ABOUT 150*C. WHEREBY THE VAPOROUS HALOGENO-ACETIC ACIDS ARE PARTIALLY DEHALOGENATED TO FORM THE DEHALOGENATED HALOGENOACETIC ACID AND HYDROGEN CHLORIDE, CONDENSING THE HALOGENOACETIC ACID, ABSORBING THE HYDROGEN CHLORIDE WITH WATER, COMBINING THE RESIDUAL UNREACTED HYDROGEN WITH FRESH HYDROGEN, AND RECYCLING THE COMBINED HYDROGEN TO THE HYDROGEN CONTACT POINT WITH SAID SOLUTION.
References Cited (Backward Citations)
US2671803A
Cited
US2863917A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-31 | 1966-07-02 | 1967-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-31 | 1970-07-02 | 1971-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-31 | 1974-07-02 | 1975-01-01 | $7700.00 | Window Closed / Lapsed |