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Sorption characteristics and performance of an acid dye on a gel‐type weak anion exchanger in a finite bath
Author(s) -
Cabrera Rosa B,
FernandezLahore Hector M
Publication year - 2006
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2615
Subject(s) - amberlite , sorption , chemistry , diffusion , adsorption , thermal diffusivity , mass transfer , mass transfer coefficient , ion exchange , langmuir , langmuir adsorption model , chromatography , thermodynamics , ion , analytical chemistry (journal) , organic chemistry , physics
Abstract The sorption behaviour of carminic acid on a gel‐type weak anion exchanger was evaluated in a finite bath. Equilibrium and kinetic studies were employed to characterise the system. Adsorption isotherms were found to follow the Langmuir expression. Concentration–time profiles were obtained in a stirred vessel. The sorption kinetics was unaltered provided that the particle suspension criterion was met. Analytical equations were found for quantitative description of the system and to assist in scale‐up. Fluid‐side effects and intraparticle resistance mechanisms were revealed. The fluid‐side mass transfer coefficient ( k f ) took an almost constant value of 2.6 × 10 −5 m s −1 under these experimental conditions. Amberlite IRA‐67, owing to its gel structure, was treated so as to present a homogeneous diffusion type, and a solid diffusivity ( D s ) value of 3.16 × 10 −10 m 2 s −1 was determined experimentally. This value was insensitive to stirrer speed and could be considered constant for further design purposes. Overall mass transfer in the system showed a mixed nature with a balanced contribution of both resistances (δ ≈ 1). Copyright © 2006 Society of Chemical Industry