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Properties of Cyclodextrins. Part V. Inclusion Isotherms and Kinetics of Inclusion of Benzoic Acid and m‐Chlorobenzoic Acid on β ‐E25 Cyclodextrin‐Epichlorohydrin Resin
Author(s) -
Wiedenhof N.,
Trieling A. G.
Publication year - 1971
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.19710230405
Subject(s) - benzoic acid , chemistry , epichlorohydrin , langmuir , freundlich equation , isothermal process , kinetics , cyclodextrin , inclusion (mineral) , inclusion compound , adsorption , organic chemistry , thermodynamics , physics , mineralogy , quantum mechanics
In the previous part of this series (Stärke 21 [1969], 163) it has been shown that β‐E25 resins have affinity for aromatic compounds, e.g. benzoic acid and m‐chlorobenzoic acid. Now it appears that mainly the undissociated acids are involved. The isothermal inclusion of undissociated benzoic acid can be described by a Langmuir isotherm. The isothermal inclusion of undissociated metachlorobenzoic acid follows no Langmuir equation. However, this inclusion can be described by a Freundlich isotherm. The kinetics of sorption of both acids are very complicated. At least three kinetic mechanisms are probably involved.