US4222956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of cyanocarboxylic acids
Assignee: Evonik Operations GmbH
•
Filing: 1979-02-14
•
Granted: 1980-09-16
•
Expires: 1999-02-14
Abstract
Abstract Cyanocarboxylic acids are prepared by reacting halocarboxylic acids with cyanohydrins, preferably at a pH of 9 to 11.
Inventors
- 👤 Axel Kleemann
- 👤 Peter Schalke
- 👤 Detlef Arnoldi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:04
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
58 words
A process for the production of a cyanoalkanoic acid comprising reacting a haloalkanoic acid in the presence of an alkaline acting material with a cyanohydrin of the formula ##STR2## where R 1 is hydrogen or alkyl of 1 to 8 carbon atoms and R 2 is alkyl of 1 to 8 carbon atoms in the presence of water.
Claim 2
Dependent Claim
58 words
A process for the production of a cyanoalkanoic acid comprising reacting a haloalkanoic acid in the presence of an alkaline acting material with a cyanohydrin of the formula ##STR2## where R 1 is hydrogen or alkyl of 1 to 8 carbon atoms and R 2 is alkyl of 1 to 8 carbon atoms in the presence of water.
Claim 3
Dependent Claim
27 words
A process according to claim 1 wherein R 1 is alkyl of 1 to 4 carbon atoms and R 2 is alkyl of 1 to 4 carbon.
Claim 4
Dependent Claim
26 words
A process according to claim 2 wherein the haloalkanoic acid has 2 to 6 carbon atoms and the cyanoalkanoic acid has 2 to 6 carbon atoms.
Claim 5
Dependent Claim
17 words
A process according to claim 3 wherein the halogen of the haloalkanoic is chlorine, bromine, or iodine.
Claim 6
Dependent Claim
18 words
A process according to claim 4 wherein the haloalkanoic acid is haloacetic acid and the cyanohydrin is acetone.
Claim 7
Dependent Claim
13 words
A process according to claim 5 wherein the haloacetic acid is chloroacetic acid.
Claim 8
Dependent Claim
17 words
A process according to claim 1 wherein the pH of the reaction mixture is 9 to 11.
Claim 9
Dependent Claim
20 words
A process according to claim 1 wherein the reaction is carried out at a temperature between 40° and 130° C.
Claim 10
Dependent Claim
22 words
A process according to claim 8 wherein there is employed at least about 1 mole of cyanohydrin per mole of haloalkanoic acid.
Claim 11
Dependent Claim
21 words
A process according to claim 9 wherein there is employed 1.01 to 1.30 moles of cyanohydrin per mole of haloalkanoic acid.
Claim 12
Dependent Claim
21 words
A process according to claim 10 wherein there is employed 1.05 to 1.15 moles of cyanohydrin per mole of haloalkanoic acid.
Claim 13
Dependent Claim
15 words
A process according to claim 11 wherein the temperature is between 70° and 90° C.
Claim 14
Dependent Claim
24 words
A process according to claim 1 wherein there is employed at least about 1 mole of cyanohydrin per mole of salt of haloalkanoic acid.
Claim 15
Dependent Claim
21 words
A process according to claim 13 wherein there is employed 1.01 to 1.30 moles of cyanohydrin per mole of haloalkanoic acid.
Claim 16
Dependent Claim
21 words
A process according to claim 1 wherein there is employed a salt of the alkanoic acid at a weakly alkaline pH.
Claim 17
Dependent Claim
13 words
A process according to claim 15 wherein the pH is 8 to 12.
Claim 18
Dependent Claim
31 words
A process according to claim 16 wherein the temperature is 40° to 130° C. and there are employed 1.01 to 1.30 moles of cyanohydrin per mole of salt of haloalkanoic acid.
Claim 19
Dependent Claim
13 words
A process according to claim 1 wherein water is the sole solvent added.
References Cited (Backward Citations)
US2338834A
Cited
US2480380A
Cited
GB824640A
Cited
US2985682A
Cited
US3360540A
Cited
US3384654A
Cited
US3375268A
Cited
DE1938080U
Cited
US3773808A
Cited
US3655723A
Cited
US3798256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |