CO2 absorption performance in advanced water-lean diamine solvents

二胺 水溶液 化学 解吸 吸水率 溶剂 粘度 吸收(声学) 溶解度 化学工程 有机化学 材料科学 吸附 工程类 复合材料
作者
Yanjie Xu,Tao Wang,Han‐Qing Yu,Hai Yu,Mengxiang Fang,Graeme Puxty
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:425: 131410-131410 被引量:11
标识
DOI:10.1016/j.cej.2021.131410
摘要

In an effort to reduce energy penalties, a range of advanced water-lean solutions blended from one of 8 diamines, an organic solvent diluent and water, were screened. The diamines N,N-dimethyl-1,3-propanediamine and N,N-dimethyl-1,2-ethanediamine with one primary and one tertiary amino group remain homogenous during CO2 uptake with the addition of cosolvents (1-methyl-2-pyrrolidinone or sulfolane) and are further investigated for absorption and desorption performance compared with their corresponding aqueous solutions. Water-lean solutions with different water concentrations are tested to explain the impact of water content on the solution performance. Physical properties such as density and viscosity are also measured for a versatile evaluation. The results show that diamine water-lean solutions obtain low viscosity, preferable cyclic capacities and rapid absorption and desorption rates. ENH-5% H2O (mass ratio DMEDA: NMP: H2O = 3:6.5:0.5) shows the most competitive advantages with comparable viscosity (1.49 mPa∙S at 313 K) to aqueous MEA-H2O and a 140% improvement in cyclic capacity. Four-fold higher desorption rate is gained ESH-5%H2O (mass ratio DMEDA: SFL: H2O = 3:6.5:0.5) compared with MEA-H2O. Considerable reduction in energy penalties is expected to be achieved in diamine water-lean solutions. In addition, the equilibrium solubility of diamine water-lean solutions also shows potential for industrial application due to their sensitivity to CO2 partial pressure in contrast with aqueous solutions.

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