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Mass transfer performance and correlations for CO 2 absorption into aqueous blended PG/MEA in PTFE membrane contactor
Author(s) -
Gao Ge,
Gao Hongxia,
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.6191
Subject(s) - contactor , mass transfer , hollow fiber membrane , flue gas , absorption (acoustics) , aqueous solution , membrane , carbon dioxide , mass transfer coefficient , analytical chemistry (journal) , partial pressure , chemistry , mass flux , flux (metallurgy) , materials science , amine gas treating , chemical engineering , chromatography , thermodynamics , composite material , oxygen , organic chemistry , power (physics) , physics , biochemistry , engineering
BACKGROUND The method for capturing carbon dioxide (CO 2 ) with amine solution in a hollow fiber membrane contactor has been identified as a potential large‐scale application technology for capturing CO 2 from flue gas. The mass transfer performance of CO 2 relies in large extent on the operating conditions, the types of absorbents and the properties of membrane materials. Therefore selecting the appropriate absorbent and studying the effect of operating parameters on the mass transfer performance become of paramount importance. RESULTS The experimental results showed that the blended potassium glycinate/monoethanolamine solution has better CO 2 absorption performance and higher surface tension than the single monoethanolamine solution under the same conditions. Furthermore, the experimental results illustrated that the CO 2 absorption flux increases as the gas velocity, CO 2 partial pressure and liquid velocity increase, and decreases with the increase of CO 2 loading and membrane contactor length; and the CO 2 removal efficiency increases as the liquid velocity and membrane contactor length increase, and decreases with the increase of CO 2 loading, gas velocity and CO 2 partial pressure. Additionally, new correlations for the prediction of the CO 2 absorption flux J CO2 and the CO 2 removal efficiency η CO2 are proposed in this work. The calculated data of CO 2 absorption flux and CO 2 removal efficiency were found to be in satisfactory agreement with experimental results, with absolute average deviation (AAD) lower than 4.42%. CONCLUSION The correlations for the prediction of J CO2 and η CO2 based on the experimental results are of significance for predicting the operating parameters and design of a polytetrafluoroethylene (PTFE) hollow fiber membrane contactor. © 2019 Society of Chemical Industry