Process for optical resolution of crude trans-1,2-cyclohexanediamine (US Patent 4085138)

Patent number: 4085138 Granted: 1978-04-18 Filed: 1976-08-03 Inventors: Thomas A. Whitney (Roselle, NJ, US) Assignees: Exxon Research & Engineering Co. (Linden, NJ, US)

Abstract

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