Description of the Mutual Solubilities of Fatty Acids and Water With the CPA EoS

authors	Oliveira, MB; Pratas, MJ; Marrucho, IM; Queimada, AJ; Coutinho, JAP
nationality	International
journal	AICHE JOURNAL
author keywords	biodiesel; CPA EoS; fatty acids; mutual solubilities; water
keywords	EQUATION-OF-STATE; PLUS LIQUID EQUILIBRIA; BIODIESEL PRODUCTION; ASSOCIATING MOLECULES; TERNARY-SYSTEMS; DIBASIC ESTERS; IONIC LIQUIDS; PROCESS MODEL; MIXTURES; PREDICTION
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
publisher	JOHN WILEY & SONS INC
issn	0001-1541
year published	2009
volume	55
issue	6
beginning page	1604
ending page	1613
digital object identifier (doi)	10.1002/aic.11766
web of science category	Engineering, Chemical
subject category	Engineering
unique article identifier	WOS:000266512000025