ICCOM CNR via Madonna del Piano, 10-50019 Sesto Fiorentino, Firenze, Italy.
ChemSusChem. 2012 Sep;5(9):1724-31. doi: 10.1002/cssc.201200062. Epub 2012 Jul 9.
This experimental study describes efficient CO₂ capture by 2-amino-2-methyl-1-propanol (AMP)/piperazine (PZ) in ethylene glycol monoethyl ether (EGMEE, 2-ethoxyethanol) containing approximately 15 wt % of water. In these experiments, the solvent is continuously circulated between the absorber (packed-bed reactor at 30, 40, or 45 °C) and the desorber (at 80, 85, or 90 °C). The CO₂ -solvent reaction equilibria have been investigated by using ¹³C NMR spectroscopy, which provides confirmatory evidence that the formation of mono- and biscarbamate derivatives of PZ accounts for most of the CO₂ absorbed by the AMP/PZ/EGMEE/H₂O blend. The solid-state structures of AMP carbamate and of the carbonate salt of protonated AMP have been determined by using XRD. Both AMPCO₂(-) and CO(3)(2-) species completely convert to the monoalkyl carbonates on dissolving the respective salts in methanol, ethanol, or ethylene glycol.
本实验研究描述了 2-氨基-2-甲基-1-丙醇 (AMP)/哌嗪 (PZ) 在乙二醇单乙醚 (EGMEE，2-乙氧基乙醇) 中有效捕集 CO₂，其中含有约 15wt%的水。在这些实验中，溶剂在吸收器（30、40 或 45°C 的填充床反应器）和解吸器（80、85 或 90°C）之间连续循环。¹³C NMR 光谱用于研究 CO₂-溶剂反应平衡，提供了确凿的证据表明，PZ 的单和双氨基甲酸酯衍生物的形成占 AMP/PZ/EGMEE/H₂O 混合物吸收的大部分 CO₂。使用 XRD 确定了 AMP 氨基甲酸酯的固态结构和质子化 AMP 的碳酸盐盐的固态结构。在甲醇、乙醇或乙二醇中溶解相应的盐时，AMPCO₂(-)和 CO(3)(2-) 物种完全转化为单烷基碳酸盐。
