Claims
- 1. A process for separating an aliphatic aminonitrile or diamine having 4 to 12 carbon atoms from a mixture consisting essentially of a cyclic, aliphatic, mono-unsaturated amine having a corresponding number of carbon atoms, said aliphatic aminonitrile being selected from the group consisting of 4-aminobutyronitrile, 5-aminovaleronitrile, 2-methyl-5-aminovaleronitrile, 6-aminocapronitrile, 12-aminododecanenitrile, said diamine being selected from the group consisting of 1,4-tetramethylenediamine, 1,5-pentamethylenediamine, 2-methyl-1,5-pentamethylenediamine, 1,6-hexamethylenediamine, 1,12-dodecanediamine, and said cyclic, aliphatic mono-unsaturated amine being selected from the group consisting of dihydropyrrole, tetrahydropyridine, 2-methyltetrahydropyridine, tetrahydroazepine, and mono-unsaturated cyclododecylamine, which consists essentially of adding a caustic compound to the mixture in the amount in the range of about 0.025% by weight to an amount about 5% in excess of the stoichiometric amount of the cyclic, aliphatic, mono-unsaturated amine in the mixture, and then distilling the aliphatic aminonitrile or diamine from the mixture at a temperature less than about 170 degrees C. and at a pressure less than atmospheric.
- 2. The process of claim 1 in which the caustic compound is selected from the group consisting of alkali metal hydroxides, tetraalkylammonium hydroxides, alkaline earth hydroxides, alkali metal alkoxides and alkaline earth metal alkoxides.
- 3. The process of claim 1 in which the pressure used in the distillation is less than about 100 mm of mercury.
REFERENCE TO PRIOR APPLICATION
This application is a continuation-in-part of U.S. patent application Ser. No. 07/648,002 filed Jan. 30, 1991, abandoned.
US Referenced Citations (13)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0223419 |
Jun 1958 |
AUX |
0562335 |
Aug 1958 |
CAX |
1912720 |
Oct 1969 |
DEX |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
648002 |
Jan 1991 |
|