CO2 absorption into primary and secondary amine aqueous solutions with and without copper ions in a bubble column

Chemical absorption of CO2 into aqueous amine solutions using a nonstirred bubble column was experimentally investigated. The performance four different primary and secondary amines including monoethanolamine (MEA), piperazine (PZ), 2-piperidineethanol (2PE), homopiperazine (HPZ) were compared. effects initial concentration amine, the inlet mole fraction CO2, solution temperature on rate loading (mol CO2/mol amine) studied in range 0.02-1 M, 0.10-0.15, 25-40 °C, respectively. effect presence copper ions also studied. By comparison breakthrough curves at operational conditions, it revealed that shortest longest time for appearance point observed MEA HPZ solutions, MEA, 2PE, PZ, 25 0.2 M 0.15 1.06, 1.14, 1.13, 1.18 mol decreasing from to 0.10, slightly decreased. As decreased, increased. Also, absorbent resulted decrease solutions. In case PZ 2PE amines, adding led precipitation even low ion concentrations.