A process for separating one or more aliphatic diamines from reductive amination reaction solvents and impurities comprising the steps of: feeding one or more cycloaliphatic cyanoaldehydes, hydrogen, ammonia, optionally water, and optionally one or more solvents into a reductive amination reactor system; wherein said one or more cycloaliphatic cyanoaldehydes are selected from the group consisting of 1,3-cyanocyclohexane carboxaldehyde, 1,4-cyanocyclohexane carboxaldehyde, mixtures thereof, and combinations thereof; contacting said one or more cycloaliphatic cyanoaldehydes, hydrogen, and ammonia with each other in the presence of one or more heterogeneous metal based catalyst systems at a temperature in the range of from 80° C to 160° C and a pressure in the range of from 4.9 to 24.5 MPa gauge (700 to 3500 psig); wherein said one or more heterogeneous metal based catalyst systems comprises a metal selected from the group consisting of Co, Ni, oxides thereof, mixtures thereof, and combinations thereof; thereby forming a product mixture comprising one or more cycloaliphatic diamines, optionally one or more bicyclic by-products, optionally one or more cycloaliphatic aminonitriles, optionally one or more cycloaliphatic aminoalcohols, optionally one or more oligomeric by-products, ammonia, water, hydrogen, and optionally one or more solvents; removing said product mixture from the reactor system; removing at least a portion of said ammonia, said hydrogen, or mixture thereof from said product mixture via distillation; removing at least a portion of said water and said one or more optional solvents via distillation; removing at least a portion of one or more optional bicyclic by-products via distillation; removing one or more optional cycloaliphatic aminonitriles, one or more optional cycloaliphatic aminoalcohols, and one or more optional oligomeric by-products via distillation; thereby separating said one or more cycloaliphatic diamines from said product mixture. feeding one or more cycloaliphatic cyanoaldehydes, hydrogen, ammonia, optionally water, and optionally one or more solvents into a reductive amination reactor system; wherein said one or more cycloaliphatic cyanoaldehydes are selected from the group consisting of 1,3-cyanocyclohexane carboxaldehyde, 1,4-cyanocyclohexane carboxaldehyde, mixtures thereof, and combinations thereof; contacting said one or more cycloaliphatic cyanoaldehydes, hydrogen, and ammonia with each other in the presence of one or more heterogeneous metal based catalyst systems at a temperature in the range of from 80° C to 160° C and a pressure in the range of from 4.9 to 24.5 MPa gauge (700 to 3500 psig); wherein said one or more heterogeneous metal based catalyst systems comprises a metal selected from the group consisting of Co, Ni, oxides thereof, mixtures thereof, and combinations thereof; thereby forming a product mixture comprising one or more cycloaliphatic diamines, optionally one or more bicyclic by-products, optionally one or more cycloaliphatic aminonitriles, optionally one or more cycloaliphatic aminoalcohols, optionally one or more oligomeric by-products, ammonia, water, hydrogen, and optionally one or more solvents; removing said product mixture from the reactor system; removing at least a portion of said ammonia, said hydrogen, or mixture thereof from said product mixture via distillation; removing at least a portion of said water and said one or more optional solvents via distillation; removing at least a portion of one or more optional bicyclic by-products via distillation; removing one or more optional cycloaliphatic aminonitriles, one or more optional cycloaliphatic aminoalcohols, and one or more optional oligomeric by-products via distillation; thereby separating said one or more cycloaliphatic diamines from said product mixture.