The volumic solid-liquid mass transfer coefficients in downward and upward two-phase flow through packed beds were determined by dissolution of benzoic acid cylinders; several liquid phases were tested. The coefficients were compared with those obtained by other authors and correlations were proposed. In addition, the solid-liquid mass transfer area was determined by a chemical method (dissolution of phthalic anhydride cylinders In buffer solutions); the area increased on increasing both the gas and the liquid flow rate and total wetting of the particles was reached for some operative conditions. The ratio between the solid-liquid area and the particle geometrical area was found to be a function of the actual average liquid velocity, i.e., taking into account the liquid holdup.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.