Claims
- 1. A process for the preparation of a tertiary diamine of the formula ##STR5## in which A denotes a C.sub.1 -C.sub.20 alkylene chain optionally mono- to penta-substituted by C.sub.1 -C.sub.4 -alkyl, and R.sup.1 and R.sup.2 each denote C.sub.1 -C.sub.20 -alkyl, C.sub.1 -C.sub.20 -hydroxyalkyl, C.sub.3 -C.sub.8 -cycloalkyl, C.sub.4 -C.sub.20 -alkylcycloalkyl, C.sub.4 -C.sub.20 -cycloalkylalkyl, phenyl, C.sub.7 -C.sub.20 -phenylalkyl, C.sub.1 -C.sub.20 -alkoxyalkyl, C.sub.7 -C.sub.20 -phenoxyalkyl, or when taken together, R.sup.1 and R.sup.2 denote a saturated or unsaturated C.sub.2 -C.sub.6 -alkylene chain optionally substituted by C.sub.1 -C.sub.4 -alkyl and optionally interrupted by oxygen or nitrogen, said process comprising:
- reacting a dinitrile of the formula
- NC--A--CN II,
- in which A has the aforementioned meaning, and a secondary amine of the formula ##STR6## in which R.sup.1 and R.sup.2 have the aforementioned meanings, with hydrogen at temperatures ranging from 50.degree. to 200.degree. C. and pressures ranging from 5 to 300 bar in the presence of palladium supported on an oxide selected from the group consisting of .gamma.-AlO.sub.2 O.sub.3, SiO.sub.2, TiO.sub.2 or ZrO.sub.2 or on said oxide doped with an alkali metal oxide or alkaline-earth metal oxide, as a hydrogenation catalyst.
- 2. A process as claimed in claim 1 wherein the reaction is carried out at a temperature of from 90.degree. to 170.degree. C. and a pressure of from 50 to 200 bar.
- 3. A process as claimed in claim 1 wherein the reaction is carried out at a temperature of from 120.degree. to 160.degree. C. and a pressure of from 70 to 150 bar.
- 4. A process as claimed in claim 1 wherein the reaction is carried out with a molar ratio of the secondary amine III to the dinitrile II of 2:1 to 30:1.
- 5. A process as claimed in claim 1 wherein the reaction is carried out with a molar ratio of the secondary amine III to the dinitrile II of 3:1 to 10:1.
- 6. A process as claimed in claim 1 wherein the reaction is carried out with a molar ratio of the secondary amine III to the dinitrile II of 4:1 to 8:1.
- 7. A process as claimed in claim 1 wherein the reaction is carried out at a temperature of from 90.degree. to 170.degree. C., a pressure of from 50 to 200 bar and with a molar ratio of the secondary amine III to the dinitrile II of 3:1 to 10:1.
- 8. A process as claimed in claim 1 wherein the support is .gamma.-Al.sub.2 O.sub.3 containing 0.1 to 10% palladium, based on the total weight of the catalyst.
- 9. A process as claimed in claim 1 wherein the support is .gamma.-Al.sub.2 O.sub.3 containing 0.3 to 5% palladium, based on the total weight of the catalyst.
- 10. A process as claimed in claim 1 wherein the dinitrile is adiponitrile and the secondary diamine III is dimethylamine.
Priority Claims (1)
Number |
Date |
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42 39 782.0 |
Nov 1992 |
DEX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/150,364, filed Nov. 9, 1993 (abandoned).
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DEX |
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Continuations (1)
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Number |
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Parent |
150364 |
Nov 1993 |
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