Yousefzadeh Hamed, Güler Cansu, Erkey Can, Uzunlar Erdal
Department of Chemical and Biological Engineering, Koç University, İstanbul, Turkey.
Department of Chemical Engineering, İzmir Institute of Technology, İzmir, Turkey.
Turk J Chem. 2022 Feb 23;46(4):999-1010. doi: 10.55730/1300-0527.3410. eCollection 2022.
Chemical absorption of CO into aqueous amine solutions using a nonstirred bubble column was experimentally investigated. The performance of CO absorption of four different primary and secondary amines including monoethanolamine (MEA), piperazine (PZ), 2-piperidineethanol (2PE), and homopiperazine (HPZ) were compared. The effects of initial concentration of amine, the inlet mole fraction of CO, and solution temperature on the rate of CO absorption and CO loading (mol CO/mol amine) were studied in the range of 0.02-1 M, 0.10-0.15, and 25-40 °C, respectively. The effect of the presence of copper ions in the amine solution on CO loading was also studied. By comparison of the breakthrough curves of the amines at different operational conditions, it was revealed that the shortest and longest time for the appearance of the breakthrough point was observed for MEA and HPZ solutions, respectively. CO loading of MEA, 2PE, PZ, and HPZ aqueous solutions at 25 °C, 0.2 M of initial concentration of amine, and 0.15 of inlet mole fraction of CO were 1.06, 1.14, 1.13, and 1.18 mol CO/mol amine, respectively. By decreasing the inlet mole fraction of CO from 0.15 to 0.10, CO loading slightly decreased. As the initial concentration of amine and temperature decreased, CO loading increased. Also, the presence of copper ions in the absorbent solution resulted in a decrease in the CO loading of MEA and HPZ aqueous solutions. In case of PZ and 2PE amines, adding copper ions led to precipitation even at low copper ion concentrations.
采用非搅拌鼓泡塔对CO在胺水溶液中的化学吸收进行了实验研究。比较了四种不同伯胺和仲胺（包括一乙醇胺（MEA）、哌嗪（PZ）、2-哌啶乙醇（2PE）和高哌嗪（HPZ））对CO的吸收性能。分别在0.02 - 1 M、0.10 - 0.15和25 - 40℃范围内研究了胺的初始浓度、CO入口摩尔分数和溶液温度对CO吸收速率和CO负载量（mol CO/mol胺）的影响。还研究了胺溶液中铜离子的存在对CO负载量的影响。通过比较不同操作条件下胺的穿透曲线发现，MEA和HPZ溶液分别观察到出现穿透点的最短和最长时间。在25℃、胺初始浓度为0.2 M、CO入口摩尔分数为0.15时，MEA、2PE、PZ和HPZ水溶液的CO负载量分别为1.06、1.14、1.13和1.18 mol CO/mol胺。将CO入口摩尔分数从0.15降至0.10时，CO负载量略有下降。随着胺初始浓度和温度降低，CO负载量增加。此外，吸收剂溶液中铜离子的存在导致MEA和HPZ水溶液的CO负载量降低。对于PZ和2PE胺，即使在低铜离子浓度下添加铜离子也会导致沉淀。
