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US4478759A
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Preparation of aminoitriles
Assignee: BASF SE
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Filing: 1981-07-15
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Granted: 1984-10-23
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Expires: 2001-07-15
Abstract
Abstract Aminonitriles are prepared by reacting a nitrogen compound with formaldehyde and hydrogen cyanide in the presence of an additional acid at a pH below 2 and at from 10° to 70° C., the concentration of the hydrogen cyanide during the reaction being not more than 3 per cent by weight, based on the reaction mixture. The aminoacetonitriles obtained by the novel process are valuable starting materials for the preparation of dyes, fungicides, bactericides, textile assistants, rubber additives, and auxiliaries used in water softening, cosmetics, the photographic industry, the paper industry and the electroplating industry.
Inventors
- 👤 Harry Distler
- 👤 Karl-Ludwig Hock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:45
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
215 words
A process for the preparation of an aminoacetonitrile of the formula ##STR10## where R 1 and R 2 may be identical or different and each is --CH 2 --CN or ##STR11## R 1 can also be an alkyl of 1 to 8 carbon atoms and the symbols X and Y can be identical or different and x is 1, 2 or 3 and y is 0, 1, 2 or 3, which process comprises: reacting ammonia or an amine with formaldehyde and hydrogen cyanide in the presence of an additional acid, wherein the nitrogen compound used has the formula ##STR12## where R 3 and R 4 are each hydrogen, or R 3 or R 4 or both are ##STR13## if R 1 or R 2 or both are ##STR14## and R 3 can also have the same meaning as R 1 if R 1 is an alkyl of 1 to 8 carbon atoms and x and y have the above meanings, wherein the reaction is conducted at a pH of below 2, and at from 10° to 70° C., and wherein hydrogen cyanide is added to the reaction mixture at a rate such that the concentration of hydrogen cyanide during the reaction is not more than 3 percent by weight, based on the total reaction mixture.
Claim 2
Dependent Claim
215 words
A process for the preparation of an aminoacetonitrile of the formula ##STR10## where R 1 and R 2 may be identical or different and each is --CH 2 --CN or ##STR11## R 1 can also be an alkyl of 1 to 8 carbon atoms and the symbols X and Y can be identical or different and x is 1, 2 or 3 and y is 0, 1, 2 or 3, which process comprises: reacting ammonia or an amine with formaldehyde and hydrogen cyanide in the presence of an additional acid, wherein the nitrogen compound used has the formula ##STR12## where R 3 and R 4 are each hydrogen, or R 3 or R 4 or both are ##STR13## if R 1 or R 2 or both are ##STR14## and R 3 can also have the same meaning as R 1 if R 1 is an alkyl of 1 to 8 carbon atoms and x and y have the above meanings, wherein the reaction is conducted at a pH of below 2, and at from 10° to 70° C., and wherein hydrogen cyanide is added to the reaction mixture at a rate such that the concentration of hydrogen cyanide during the reaction is not more than 3 percent by weight, based on the total reaction mixture.
Claim 3
Dependent Claim
37 words
A process as set forth in claim 1, wherein the reaction is carried out with from 1 to 1.1 moles of starting material II and/or from 1 to 1.1 moles of hydrogen cyanide per mole of formaldehyde.
Claim 4
Dependent Claim
20 words
A process as set forth in claim 1, wherein the reaction is carried out at from 10° to 60° C.
Claim 5
Dependent Claim
20 words
A process as set forth in claim 1, wherein the reaction is carried out at from 15° to 55° C.
Claim 6
Dependent Claim
20 words
A process as set forth in claim 1, wherein the reaction is carried out at from 20° to 49° C.
Claim 7
Dependent Claim
30 words
A process as set forth in claim 1, wherein the reaction is carried out with a total of from 40 to 80 percent by weight, based on formaldehyde, of water.
Claim 8
Dependent Claim
29 words
A process as set forth in claim 1, wherein, during the reaction, the concentration of hydrogen cyanide in the reaction mixture is from 0.01 to 3 percent by weight.
Claim 9
Dependent Claim
29 words
A process as set forth in claim 1, wherein, during the reaction, the concentration of hydrogen cyanide in the reaction mixture is from 0.01 to 2 percent by weight.
Claim 10
Dependent Claim
29 words
A process as set forth in claim 1, wherein, during the reaction, the concentration of hydrogen cyanide in the reaction mixture is from 0.01 to 1 percent by weight.
References Cited (Backward Citations)
US2855428A
Cited
US3061628A
Cited
US3337607A
Cited
DE1493910A1
Cited
US3984453A
Cited
DE1768257A1
Cited
US3504011A
Cited
US3959342A
Cited
US3925448A
Cited
DE2503582A1
Cited
US4022815A
Cited
US4113764A
Cited
US4134889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |