화학공학소재연구정보센터
Industrial & Engineering Chemistry Research, Vol.59, No.14, 6565-6579, 2020
Amination Reaction of Cyclohexanol over a Commercial Ni-Based Catalyst, Part I: Influence of Operating Conditions
Selective production of amines using non-noble-based catalysts is of crucial industrial importance. The amination of cyclohexanol (CHOL) was performed in a fixed-bed reactor, using NH3 as an aminating agent in the presence of H-2, over a commercial Ni-based catalyst, yielding cyclohexylamine (CHA). Higher boiling-point byproducts or heavy ends (HEs) were also detected. Prior to reaction, the catalyst pretreatment temperature was optimized, because at high reduction temperatures, CHOL conversion and product yields decreased because of Ni sintering. A parametric study was then performed, ranging pressure from 1 to 4 barg, temperature from 100 to 200 degrees C, and the NH3/H-2/CHOL molar ratio from 1.2:1.2:1 to 3.2:3.2:1. Overall, the obtained results showed that the amination reaction of CHOL is highly temperature-dependent, while pressure slightly affects selectivity. High selectivity toward CHA accompanied by low HE selectivity was obtained, for smoother operating conditions than those previously reported, representing a highly interesting approach to apply at the industrial scale.