| 摘要 |
Crude trans-1,2-cyclohexanediamine (DACH) contained in a mixture of amines derived as a by-product from the manufacture of 1,6-hexanediamine (HDA) or any other synthesis process crude by-product stream may be directly resolved into its optical isomers by using a mixture of tartaric acid and a second acid selected from the group consisting of C1 to C8 carboxylic acids and HCl, without first separating the DACH in high purity from the mixed amine component by-product stream. Alternatively, racemic DACH may be separated from a crude mixed amine component by-product stream by use of oxalic, sulfuric and/or nitric acids. This racemic product may then be optically resolved by techniques known in the art.
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