Details

Autor(en) / Beteiligte

• Xu, Yanjie
• Fang, Mengxiang
• Yang, Qi
• Xia, Zhixiang
• Yu, Hai
• Wang, Tao
• Chen, Kexian
• Puxty, Graeme

Titel

Diamine based water‐lean CO 2 solvent with extra high cyclic capacity and low viscosity

Ist Teil von

• Greenhouse gases: science and technology, 2021-10, Vol.11 (5), p.828-836

Erscheinungsjahr

2021

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• Abstract The industrial application of emerging water‐lean solvents to CO 2 capture from flue gas is challenged by their high viscosity. In this work, we report a novel water‐lean CO 2 solvent which possesses lower viscosity and higher CO 2 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, CO 2 cyclic capacity and regeneration energy of ENH and compared it with the reference monoethanolamine (MEA) based solvents. It was found that ENH containing 5% H 2 O (ENH‐5%H 2 O) with a CO 2 loading of 0.767 mol CO 2 ·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% H 2 O showing a 140% improvement compared to aqueous MEA. Regeneration energy of ENH‐5% H 2 O was estimated to be 2.418 GJ·tCO 2 –1 which is 36% lower than the 30 wt. % aqueous MEA solvent. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.