US4242286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing benzotrifluoride and its derivatives
Assignee: Daikin Industries Ltd
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Filing: 1979-03-22
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Granted: 1980-12-30
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Expires: 1999-03-22
Abstract
Abstract A process for preparing bentotrifluoride or its derivatives by contacting benzotrichloride or its derivatives corresponding thereto with hydrogen fluoride in a gaseous phase, characterized in that the contact is carried out in the presence of aluminum fluoride and, if desired, of chlorine.
Inventors
- 👤 Yohnosuke Ohsaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:32
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/202; C07C17/206
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
37 words
A process for preparing benzotrifluoride or its derivative by contacting benzotrichloride or its derivative corresponding thereto with hydrogen fluoride in a gaseous phase, characterized in that the contact is carried out in the presence of aluminum fluoride.
Claim 2
Dependent Claim
37 words
A process for preparing benzotrifluoride or its derivative by contacting benzotrichloride or its derivative corresponding thereto with hydrogen fluoride in a gaseous phase, characterized in that the contact is carried out in the presence of aluminum fluoride.
Claim 3
Dependent Claim
32 words
The process according to claim 1, wherein hydrogen fluoride is used in an amount of about 1 to 2 moles to each chlorine atom to be substituted in benzotrichloride or its derivative.
Claim 4
Dependent Claim
19 words
The process according to claim 1, wherein the aluminum chloride is of β- or γ-type or a mixture thereof.
Claim 5
Dependent Claim
19 words
The process according to claim 1, wherein the contacting is effected at a temperature of 200° to 450° C.
Claim 6
Dependent Claim
21 words
The process according to any of claims 1 to 4, wherein the contacting is effected in the presence of elementary chlorine.
Claim 7
Dependent Claim
27 words
The process according to claim 5, wherein the elementary chlorine is used in an amount of about 0.5 to 10% by moles to benzotrichloride or its derivative.
Claim 8
Dependent Claim
61 words
In the preparation of benzotrifluoride by a process which comprises catalytically reacting benzotrichloride with hydrogen fluoride, the improvement which comprises reacting in the gaseous phase benzotrichloride and hydrogen fluoride in the presence of an aluminum fluoride catalyst thereby producing benzotrifluoride at an accelerated rate and avoiding vigorous agitation of a liquid medium containing hydrogen fluoride at high pressures and high temperatures.
Claim 9
Dependent Claim
61 words
In the preparation of benzotrifluoride by a process which comprises catalytically reacting benzotrichloride with hydrogen fluoride, the improvement which comprises reacting in the gaseous phase benzotrichloride and hydrogen fluoride in the presence of an aluminum fluoride catalyst thereby producing benzotrifluoride at an accelerated rate and avoiding vigorous agitation of a liquid medium containing hydrogen fluoride at high pressures and high temperatures.
References Cited (Backward Citations)
US2062743A
Cited
US2121330A
Cited
US3755477A
Cited
US3950445A
Cited
US4079090A
Cited
US4012453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |