Experimental study on the absorption enhancement of CO 2 by MDEA‐MEA based nanofluids

作者：Jiaxin Liang, Huiyu Han, Wenbo Li, Xiaoxun Ma, Long Xu · 发表于：The Canadian Journal of Chemical Engineering · 年份：2021 · DOI：10.1002/cjce.24322 · 被引用次数：23 · 研究领域：Carbon Dioxide Capture Technologies、Phase Equilibria and Thermodynamics、Adsorption and Cooling Systems

Abstract Nanofluids promote the application of nanotechnology in the mass transfer process, which can effectively reduce mass transfer resistance and increase the gas–liquid mass transfer rate. A bubbling absorption system was used to explore the CO 2 absorption performance of methyldiethanolamine (MDEA) and monoethanolamine (MEA) blended nanofluids. TiO 2 nanoparticles and sodium polyacrylate (ASAP) surfactant were added to MDEA‐MEA aqueous solutions to prepare nanofluids. The effects of MDEA concentration, MEA concentration, blended amine ratio, and nanoparticle solid content on CO 2 capture performance were investigated, respectively. The study found that, compared with single‐component MEA/MDEA solutions, nanofluids have a more significant enhancement in CO 2 absorption of blended amines. The increase of MEA concentration in blended amine has a negative effect on the enhanced CO 2 absorption of TiO 2 nanoparticles. The enhancement factor of MDEA‐MEA nanofluids at each solid content is higher than that of two single‐component nanofluids. The best solid content of TiO 2 nanoparticles in the MDEA‐MEA system is 0.6 g/L, while the enhancement factor E in 25% MDEA + 5% MEA nanofluids can reach up to 1.36. Finally, a new empirical formula was proposed to predict the enhancement factor and optimum solid content of TiO 2 ‐MEA/MDEA nanofluids.