US4025545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogen halide removal in halogenated aliphatic nitrile production
Assignee: Uniroyal Chemical Co Inc
•
Filing: 1976-02-25
•
Granted: 1977-05-24
•
Expires: 1996-02-25
Abstract
Abstract Hydrogen halide levels of halogenated aliphatic nitriles are unexpectedly reduced by condensing a vapor comprising hydrogen halide and halogenated aliphatic nitrile at selected elevated temperatures, thus producing a product having reduced hydrogen halide levels and improved storage stability.
Inventors
- 👤 Sudhir K. Mendiratta
- 👤 Ronald L. Dotson
- 👤 George M. Shipley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:25
CPC Classifications
C; C07; C07C; C07C255/00; C07C255/01; C07C255/10; C01; C01B; C01B7/00; C01B7/01; C01B7/07; C01B7/0706
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
162 words
A method for removing hydrogen halide from a mixture of said hydrogen halide and a halogenated saturated aliphatic nitrile, said halide and halogen substituents being selected from the group consisting of chlorine, bromine, or both, and said hydrogen halide and said nitrile having a relationship such that below a first predetermined temperature said nitrile and at least a portion of said hydrogen halide are associated in combined form in said mixture and such that at or above a second predetermined temperature above said first temperature said association is substantially destroyed, which comprises: (1) Heating said mixture at a temperature equal or greater than said second predetermined temperature to provide a vapor comprising said hydrogen halide and at least a portion of said halogenated aliphatic nitrile in substantially unassociated form. (2) Condensing said vapor at a condensation temperature above said first temperature but below the boiling point of said nitrile, recovering said nitrile as a condensate having reduced levels of said hydrogen halide.
Claim 2
Independent Claim
162 words
A method for removing hydrogen halide from a mixture of said hydrogen halide and a halogenated saturated aliphatic nitrile, said halide and halogen substituents being selected from the group consisting of chlorine, bromine, or both, and said hydrogen halide and said nitrile having a relationship such that below a first predetermined temperature said nitrile and at least a portion of said hydrogen halide are associated in combined form in said mixture and such that at or above a second predetermined temperature above said first temperature said association is substantially destroyed, which comprises: (1) Heating said mixture at a temperature equal or greater than said second predetermined temperature to provide a vapor comprising said hydrogen halide and at least a portion of said halogenated aliphatic nitrile in substantially unassociated form. (2) Condensing said vapor at a condensation temperature above said first temperature but below the boiling point of said nitrile, recovering said nitrile as a condensate having reduced levels of said hydrogen halide.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein said nitrile is trichloroacetonitrile and said hydrogen halide is hydrogen chloride.
Claim 4
Dependent Claim
30 words
The process of claim 2 wherein said first temperature is in the range of 43° C.-48 ° C. and said second temperature is in the range of 58° C.-63° C.
Claim 5
Dependent Claim
17 words
The process of claim 3 wherein said vapor is condensed at a temperature between 58° C.-85° C.
Claim 6
Dependent Claim
13 words
The process of claim 4 wherein said vapor is condensed at atmospheric pressure.
Claim 7
Dependent Claim
20 words
The process of claim 4 wherein said vapor is condensed at a temperature in the range of 58° C.-63° C.
Claim 8
Dependent Claim
13 words
The process of claim 6 wherein said vapor is condensed at atmospheric pressure.
Claim 9
Dependent Claim
20 words
The process of claim 1 wherein said saturated aliphatic nitrile is a saturated lower aliphatic nitrile having 2-4 carbon atoms.
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) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |