Premium
Dynamic measurement of liquid‐phase mass transfer coefficient and significance on the SO 2 absorption rate
Author(s) -
Liu Dunyu,
Jin Jing,
Xiong Zhibo,
Stanger Rohan,
Wall Terry
Publication year - 2018
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.2242
Subject(s) - mass transfer coefficient , mass transfer , absorption (acoustics) , analytical chemistry (journal) , chemistry , phase (matter) , attenuation coefficient , flux (metallurgy) , thermodynamics , materials science , chromatography , optics , physics , organic chemistry , composite material
Liquid‐phase mass transfer coefficient is important for characterization of gas–liquid reactors and relevant to the modelling of gas absorption rate. Both direct and indirect methods have been used to obtain this coefficient. However, these methods have not been compared on the same basis. Liquid‐phase mass transfer coefficients were measured in three ways—(a) CO 2 absorption into water, (b) SO 2 absorption into 1 kmol m −3 of HCl, and (c) O 2 absorption into Na 2 SO 3 —and then normalized to the coefficient for SO 2 . Based on transient experiments, the normalized values for liquid‐phase mass transfer coefficient obtained from three methods are in turn of k L , O 2> k L , SO 2> k L , CO 2. The fluxes of SO 2 predicted from three methods were further compared with the experimental values measured in SO 2 ‐NaOH system. The fluxes predicted from k L , SO 2agreed well with the experimental values, whereas those from k L , CO 2and k L , O 2were significantly lower or higher. Therefore, the liquid‐phase mass transfer coefficient is preferably obtained from the targeted gas. Modelling on the flux of SO 2 demonstrates the transition of controlling regions against pH. At pH above 4, the gas side resistance is larger than the liquid side, whereas at pH below 4, the gas side resistance is smaller than the liquid side.