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Kinetics of the liquid phase dehydration of 1‐octanol to di‐n‐octyl ether on Amberlyst 70
Author(s) -
Casas Carlos,
Bringué Roger,
Fité Carles,
Iborra Montserrat,
Tejero Javier
Publication year - 2017
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.15741
Subject(s) - chemistry , octanol , dehydration , kinetics , reaction rate constant , solvent , adsorption , activation energy , phase (matter) , ether , chromatography , organic chemistry , partition coefficient , biochemistry , physics , quantum mechanics
The kinetics of the liquid phase dehydration of 1‐octanol to di‐n‐octyl ether (DNOE) over Amberlyst 70 was studied at 413–453 K. Mechanistic rate models assuming water and 1‐octanol adsorbed on the resin, and the free sites fraction negligible, were selected from 1‐octanol dehydration experiments. Next, the influence of DNOE, water, and 1,4‐dioxane (solvent) concentration was evaluated. DNOE and 1,4‐dioxane do not affect significantly the reaction rate, while water inhibits it strongly. Water effect was quantified by splitting the rate constant into a “true one” and a correction factor related to the fraction of active sites blocked by water. The best kinetic model stemmed from an Eley‐Rideal mechanism with water adsorbed onto the resin and DNOE released directly to the liquid phase, with a correction factor for water inhibitory effect based on a Freundlich isotherm‐like function; activation energy being 110 ± 5 kJ·mol −1 , in line with literature data on homologous reactions. © 2017 American Institute of Chemical Engineers AIChE J , 63: 3966–3978, 2017