Bin Jiang,Shuai Hou,Luhong Zhang,Na Yang,Na Zhang,Xiaoming Xiao,Xiaodong Yang,Yongli Sun,Xiaowei Tantai
Ionic liquids (ILs) as promising absorbents for SO2 capture in flue gas desulfurization have been extensively studied. In this work, a multisite absorption strategy was used to synthesize ether-linked diamine protic ionic liquids (EDPILs) for efficient SO2 capture. The prepared EDPILs containing ether-linkage chain exhibited superior SO2 absorption relative to conventional protic ionic liquids (PILs). Density functional theory calculations demonstrated that the ether-linkage chain intensified the physical interaction between EDPILs and SO2. In a subsequent experiment, bis(2-dimethylaminoethyl) ether dilactate [BDMAEE][L]2, which possessed outstanding SO2 capture capacities, was used to prepare aqueous solutions (aq), which reduced viscosity of PILs and improved their applicability. An in-depth assessment of the desulfurization performance of [BDMAEE][L]2 aq revealed that effective SO2 absorption can be achieved even at relatively low concentrations. Specifically, 50 wt % [BDMAEE][L]2 aq exhibited a high absorption capacity (1.04 molSO2/molILs, 0.097 gSO2/gabsorbents) as well as a high SO2/CO2 selectivity at 0.2 vol % SO2 and 40 °C. Overall, ether-linked absorbents with improved desulfurization performance (high SO2 absorption capacity, satisfactory SO2 removal efficiency, and excellent reusability) possess good application prospects in flue gas desulfurization.
Xi Tang,Ge Gao,Wufeng Jiang,Bin Xu,Fan Wu,Cong Luo,Xiaoshan Li,Liqi Zhang
Chain diamines, exhibiting favorable CO 2 capture properties, including a large absorption capacity and a high absorption rate, have been extensively utilized in CO 2 capture technology. It has been demonstrated that the molecular structure of chain diamines has an impact on CO 2 absorption properties. The importance of absorption heat as a main component of regeneration energy consumption can not be ignored. However, the influence of the chain diamine molecular structure on CO 2 absorption heat remained unclear. In this study, twelve chain diamines were examined to investigate their structure–activity relationship with CO 2 absorption heat. The results indicated that chain diamines with a high percentage of secondary or tertiary amino groups had a low CO 2 absorption heat. Chain diamines with methyl groups on tertiary amino groups demonstrated a diminished CO 2 absorption heat than those with ethyl groups. Compared to amino types and methyl/ethyl groups, chain lengths had a slight effect on the CO 2 absorption heat of chain diamines. Chain diamines containing two carbon atoms exhibited a slightly low CO 2 absorption heat. Furthermore, it was observed that TMDEA, with two tertiary amino groups, exhibited a high CO 2 equilibrium solubility (0.98 mol CO 2 /mol amine) and a low CO 2 absorption heat (57.52 kJ/mol). The findings of this work are of significant relevance for the screening and development of low energy-consuming chain diamines suitable for CO 2 capture industrial applications.
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