Experimental study on CO 2 absorption by aqueous ammonia solution at elevated pressure to enhance CO 2 absorption and suppress ammonia vaporization

Mengxiang Fang, Qunyang Xiang, Chunjiang Yu, Zhixiang Xia, Xuping Zhou, Danyun Cai, Zhen Wang and Hai Yu

Greenhouse Gases: Science and Technology, 2015, vol. 5, issue 2, 210-221

Abstract: The low CO 2 absorption rate and high ammonia volatile loss rate are two major issues for the ammonia‐based CO 2 capture technology. In this work, we investigated the effect of total pressure on CO 2 absorption and ammonia vaporization in ammonia solutions on a wetted‑wall column. We found that the elevated pressure absorption process was an effective way to increase CO 2 absorption rate and suppress ammonia vaporization at the same time. We also studied the mass transfer mechanism at elevated pressure and found the overall mass transfer coefficients of CO 2 absorption in both ammonia and MEA solutions at elevated pressures were lower than that under atmospheric pressure. The overall mass transfer coefficients of CO 2 absorption in 3 M NH 3 (298 K) at 1, 1.5, 2, 2.5 bar were 0.723 × 10-super-−6, 0.652 × 10-super-−6, 0.591 × 10-super-−6, 0.555 × 10-super-−6 mol/(s m-super-2 Pa) and the corresponding gas side mass transfer coefficients were 13.8 × 10-super-−6, 4.52 × 10-super-−6, 2.61 × 10-super-−6, 2.03 × 10-super-−6 mol/(s m-super-2 Pa), respectively. We also found the gas side mass transfer coefficient in the wetted‐wall column was not only dependent on the hydrodynamic conditions of the column but also influenced by the total pressure. © 2014 Society of Chemical Industry and John Wiley & Sons, Ltd

Date: 2015
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Persistent link: https://EconPapers.repec.org/RePEc:wly:greenh:v:5:y:2015:i:2:p:210-221

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