US4045502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing high purity para-chlorobenzotrifluoride
Assignee: Olin Corp
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Filing: 1976-09-29
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Granted: 1977-08-30
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Expires: 1996-09-29
Abstract
Abstract An improvement in the process for making para-chlorobenzotrifluoride by the fluorination of a mixture of the para- and meta- isomers of chlorobenzotrichloride wherein the fluorination reaction is stopped before the complete conversion of the para- and meta- isomers occurs so that the relative amount of meta- isomer of chlorobenzotrifluoride produced will be reduced.
Inventors
- 👤 Sudhir K. Bhutani
- 👤 Willard A. Nichols
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:42
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/20; C07C17/202; C07C17/206
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
56 words
In a process for making para-chlorobenzotrifluoride wherein a mixture comprising meta- and para-chlorobenzotrichloride is reacted with hydrogen fluoride, the improvement which comprises terminating the fluorination reaction when no more than 99% by weight of said para-chlorobenzotrichloride has been converted to para-chlorobenzotrifluoride and no more than 50% by weight of said meta-chlorobenzotrichloride has been converted into meta-chlorobenzotrifluoride.
Claim 2
Dependent Claim
56 words
In a process for making para-chlorobenzotrifluoride wherein a mixture comprising meta- and para-chlorobenzotrichloride is reacted with hydrogen fluoride, the improvement which comprises terminating the fluorination reaction when no more than 99% by weight of said para-chlorobenzotrichloride has been converted to para-chlorobenzotrifluoride and no more than 50% by weight of said meta-chlorobenzotrichloride has been converted into meta-chlorobenzotrifluoride.
Claim 3
Dependent Claim
45 words
The process of claim 1 wherein said para-chlorobenzotrifluoride is recovered by separating excess hydrogen fluoride from an organic phase containing said para-chlorobenzotrifluoride, neutralizing hydrogen fluoride entrapped within said organic phase, distilling said organic phase to separate out said para-chlorobenzotrifluoride and meta-chlorobenzotrifluoride from high-boiling organic residues.
Claim 4
Dependent Claim
41 words
The process of claim 1 wherein said fluorination reaction is terminated when no more than 99.6% by weight of said para-chlorobenzotrichloride has been converted to para-chlorobenzotrifluoride and no more than 25% by weight of said meta-chlorobenzotrichloride has been converted into meta-chlorobenzotrifluoride.
References Cited (Backward Citations)
US3859372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |