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Mass transfer limitations in binderless ZSM ‐5 zeolite granules during adsorption of flavour compounds from aqueous streams
Author(s) -
Gernat Deborah C,
Rozenbroek Renzo,
Brouwer Eric R,
Wielen Luuk AM,
Ottens Marcel
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.6491
Subject(s) - chemistry , zeolite , adsorption , flavour , mass transfer , aqueous solution , molecule , chemical engineering , diffusion , mass transfer coefficient , furfural , chromatography , organic chemistry , thermodynamics , food science , physics , engineering , catalysis
BACKGROUND Recently, a new process concept has been proposed to selectively adsorb wort off‐flavours, i.e. aldehydes, from alcohol‐free beers with hydrophobic zeolites. RESULTS In this work, we investigated the uptake of a mixture of wort flavour compounds (2‐methylpropanal, 2‐methylbutanal, 3‐methylbutanal, furfural, and methional), from a model solution onto binderless hydrophobic ZSM‐5 zeolite granules in order to quantify mass transfer parameters and identify bottlenecks. Subsequently, the homogenous solid diffusion model was employed to regress the effective diffusion coefficients for each molecule and experimental condition, which ranged between 10 −15 and 10 −13 m 2 s −1 , indicating strong intraparticle mass transfer limitation. Furthermore, it was found that the effective diffusion coefficient is inversely correlated to the molecules' hydrophobicity, expressed as the logD value and its isotherm affinity constant. CONCLUSION These results give valuable insight to design and improve the adsorbent material and an off‐flavour removal unit at industrial scale. © 2020 The Authors. Journal of Chemical Technology & Biotechnology published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.