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Fast screening of amine/physical solvent systems and mass transfer studies on efficient aqueous hybrid MEA/Sulfolane solution for postcombustion CO 2 capture
Author(s) -
Zou Liangyu,
Gao Hongxia,
Wu Zeyang,
Liang Zhiwu
Publication year - 2020
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.6246
Subject(s) - sulfolane , mass transfer , mass transfer coefficient , chemistry , solvent , amine gas treating , structured packing , absorption (acoustics) , desorption , aqueous solution , inert , inert gas , analytical chemistry (journal) , chromatography , materials science , organic chemistry , adsorption , composite material
BACKGROUND The addition of a physical solvent to a traditional chemical absorbent has been shown to improve the absorption and desorption performance of the absorbent system. This type of novel absorbent system combining a single physical solvent with an amine solvent is a promising development in the industrial application of CO 2 capture. RESULTS Hybrid solutions composed of Monoethanolamine (MEA), a physical solvent, and H 2 O were comprehensively investigated using the rapid solvent screening apparatus and a VLE apparatus. The results show that 30 wt% MEA with 20 wt% Sulfolane and 50 wt% H 2 O achieved higher rich loading, strong cyclic CO 2 capacity and the highest desorption rate over a wide range of CO 2 loadings. Also, the mass transfer performance of CO 2 absorption into the 30 wt% MEA and 20 wt% Sulfolane solution was investigated in a lab‐scale random packing column. The effects of liquid flow rate, liquid feed temperature, lean CO 2 loading, inert gas flow rate and CO 2 partial pressure on the mass transfer performance were evaluated in terms of volumetric overall mass transfer coefficient ( K G a v ). Furthermore, a correlation was developed for CO 2 absorption into MEA/Sulfolane solution in a random packing column using semi‐empirical models as functions. CONCLUSION Unlike for amine solution alone, inert gas flow rate is an indispensable operating parameter in the MEA/Sulfolane system. A mass transfer correlation model was established and holds significance in studying the kinetics of CO 2 absorption by a mixture of physical and chemical solvents and for the optimal design of Dixon‐ring random packing columns. © 2019 Society of Chemical Industry