Analysis of equilibrium CO2 solubility and thermodynamic models for aqueous 1-(2-hydoxyethyl)-piperidine solution
Analysis of equilibrium CO2 solubility and thermodynamic models for aqueous 1-(2-hydoxyethyl)-piperidine solution
复制标题
1-(2-羟乙基)-哌啶水溶液的平衡 CO2 溶解度和热力学模型分析
DOI：
10.1002/aic.16605
复制
发表时间：
2019-06-01
期刊：
影响因子：
3.7
通讯作者：
Liang, Zhiwu
中科院分区：
文献类型：
--
作者：
Xiao, Min;Zheng, Wenchao;Liang, Zhiwu
1-(2-羟乙基)-哌啶 (1-(2HE)-PP) 是一种具有理想性能的新型叔胺，可用于配制优异的 CO2 捕获吸收剂。测量了 1-(2HE)-PP 溶液的平衡 CO2 溶解度，温度范围为 298 至 333 K，CO2 分压为 8.1 至 101.3 kPa，初始胺浓度为 1 至 5 M。为该系统开发了两个热力学模型，即半经验模型和活度系数模型。活度系数模型显示出更好的估计溶解度，绝对平均相对偏差 (AARD) 为 7.6%。在对两种模型的比较中，进行了综合分析。为类似模型的开发提供了一些建议。此外，还根据活度系数模型预测了 CO2 负载 1-(2HE)-PP 溶液的形态图。预测 pH 值与 AARD 为 1.0% 的实验数据非常吻合。最后，评估了 1-(2-HE)PP 作为 CO2 捕集替代胺的潜力。
1-(2-Hydoxyethyl)-piperidine (1-(2HE)-PP) is a new tertiary amine with desirable properties and can be potentially used to formulate superior absorbents for CO2 capture. The equilibrium CO2 solubility of 1-(2HE)-PP solution is measured over temperatures from 298 to 333 K, CO2 partial pressures from 8.1 to 101.3 kPa and initial amine concentrations from 1 to 5 M. Two thermodynamic models, namely semiempirical model and activity coefficient model are developed for the system. The activity coefficient model shows better estimation solubility with an absolute average relative deviation (AARD) of 7.6%. In the comparison between the two models, a comprehensive analysis is presented. Some suggestions are provided for the similar model development. In addition, the speciation plot of CO2 loaded 1-(2HE)-PP solution is predicted based on the activity coefficient model. The predictive pH values agree well with experimental data with AARD of 1.0%. Finally, the potential of 1-(2-HE)PP to be an alternative amine in CO2 capture is evaluated.