abstract
Data for the mutual solubilities of fatty acid + water mixtures are scarce and so measurements for seven fatty acid (C(5)-C(10), C(12)) + water Systems were carried out. This new experimental data was successfully modelled with the cubic plus association EoS. Using data from C(6) to C(10) and the Elliot's cross-associating combining ride a correlation for the k(ij) binary interaction parameter, as a function of the acid chain length, is proposed. The mutual solubilities of water and fatty acids can be adequately described with average deviations inferior to 6% for the water rich phase and 30% for the acid rich phase. Furthermore, satisfactory predictions of solid-liquid equilibria of seven fatty acids (C(12)-C(18)) + water systems were achieved based only on the k(ij) correlation obtained from liquid-liquid equilibria data. (C) 2009 American Institute of Chemical Engineers AIChE J, 55: 1604-1613, 2009
keywords
EQUATION-OF-STATE; PLUS LIQUID EQUILIBRIA; BIODIESEL PRODUCTION; ASSOCIATING MOLECULES; TERNARY-SYSTEMS; DIBASIC ESTERS; IONIC LIQUIDS; PROCESS MODEL; MIXTURES; PREDICTION
subject category
Engineering
authors
Oliveira, MB; Pratas, MJ; Marrucho, IM; Queimada, AJ; Coutinho, JAP
our authors
Isabel Maria Delgado Jana Marrucho Ferreira
Full professor
Maria Jorge Pratas
Science and Technology Manager
Mariana Belo Oliveira
Post-doc Fellowshipacknowledgements
Financial support was provided by the national project POCI/EQU/58239/2004: