实验研究了使用非搅拌泡罩塔将CO2化学吸收到胺水溶液中。包括单乙醇胺(MEA)在内的四种不同的伯胺和仲胺的CO2吸收性能,哌嗪(PZ),2-哌啶乙醇(2PE),和高哌嗪(HPZ)进行了比较。胺初始浓度的影响,在0.02-1M的范围内研究了CO2的入口摩尔分数和溶液温度对CO2吸收速率和CO2负载(molCO2/mol胺)的影响,0.10-0.15,和25-40°C,分别。还研究了胺溶液中铜离子的存在对CO2负载的影响。通过比较不同操作条件下胺的穿透曲线,结果表明,对于MEA和HPZ溶液,观察到的临界点出现的最短和最长时间,分别。MEA的CO2负荷,2PE,PZ,和HPZ水溶液在25°C,胺初始浓度的0.2M,CO2的入口摩尔分数为1.06、1.14、1.13和1.18molCO2/mol胺,分别。通过将CO2的入口摩尔分数从0.15降低到0.10,CO2负载略微降低。随着胺的初始浓度和温度的降低,CO2负荷增加。此外,吸收剂溶液中铜离子的存在导致MEA和HPZ水溶液的CO2负载量降低。在PZ和2PE胺的情况下,即使在低铜离子浓度下,添加铜离子也会导致沉淀。
Chemical absorption of CO2 into aqueous amine solutions using a nonstirred bubble column was experimentally investigated. The performance of CO2 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 CO2, and solution temperature on the rate of CO2 absorption and CO2 loading (mol CO2/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 CO2 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. CO2 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 CO2 were 1.06, 1.14, 1.13, and 1.18 mol CO2/mol amine, respectively. By decreasing the inlet mole fraction of CO2 from 0.15 to 0.10, CO2 loading slightly decreased. As the initial concentration of amine and temperature decreased, CO2 loading increased. Also, the presence of copper ions in the absorbent solution resulted in a decrease in the CO2 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.