The industrial application of emerging water-lean solvents to CO₂ capture from flue gas is challenged by their high viscosity. In this work, we report a novel water-lean CO₂ solvent which possesses lower viscosity and higher CO₂ cyclic capacity than other water-lean solvents reported in the literature. The new solvent consists of N, N-dimethyl-1, 2-ethanediamine (DMEDA), physical cosolvent N-methyl-2-pyrrolidone (NMP) and up to 15% water (named ENH). We evaluated the effect of the solvent composition on the viscosity, CO₂ cyclic capacity and regeneration energy of ENH and compared it with the reference monoethanolamine (MEA) based solvents. It was found that ENH containing 5% H₂O (ENH-5%H₂O) with a CO₂ loading of 0.767 mol CO₂·mol amine^–1 had a viscosity of 7.603 mPa·S at 40 ˚C, which was comparable with that of traditional blended amines. Excellent cyclic capacity performance was also observed, with ENH-5% H₂O showing a 140% improvement compared to aqueous MEA. Regeneration energy of ENH-5% H₂O was estimated to be 2.418 GJ·tCO₂^–1 which is 36% lower than the 30 wt. % aqueous MEA solvent. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.

中文翻译：

---

具有超高循环容量和低粘度的二胺基贫水CO2溶剂

新兴的贫水溶剂从烟道气中捕获CO ₂的工业应用受到其高粘度的挑战。在这项工作中，我们报告了一种新型的贫水 CO ₂溶剂，与文献中报道的其他贫水溶剂相比，它具有更低的粘度和更高的 CO ₂循环容量。新溶剂由N, N-二甲基-1, 2-乙二胺 (DMEDA)、物理助溶剂N-甲基-2-吡咯烷酮 (NMP) 和最多 15% 的水（命名为 ENH）组成。我们评估了溶剂组成对ENH的粘度、CO ₂循环容量和再生能量的影响，并将其与基于单乙醇胺 (MEA) 的参考溶剂进行了比较。发现含有 5% H 的 ENH具有0.767 mol CO ₂ ·mol 胺^–1的 CO ₂负载量的₂ O (ENH-5%H ₂ O)在 40 ˚C 下的粘度为 7.603 mPa·S，与传统混合胺的粘度相当。还观察到优异的循环容量性能，与水性 MEA 相比，ENH-5% H ₂ O 显示出 140% 的改进。ENH-5% H ₂ O 的再生能量估计为 2.418 GJ·tCO ₂ ^–1，比 30 wt% 低 36%。% 水性 MEA 溶剂。© 2021 化学工业协会和 John Wiley & Sons, Ltd.