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Liquid–Liquid Equilibria in Biodiesel Production
Author(s) -
Rostami Masoume,
Raeissi Sona,
Mahmoodi Maziyar,
Nowroozi Masoud
Publication year - 2013
Publication title -
journal of the american oil chemists' society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.512
H-Index - 117
eISSN - 1558-9331
pISSN - 0003-021X
DOI - 10.1007/s11746-012-2144-5
Subject(s) - biodiesel , biodiesel production , solubility , methanol , uniquac , ternary numeral system , chemistry , binodal , ternary operation , glycerol , diesel fuel , materials science , thermodynamics , chemical engineering , organic chemistry , aqueous solution , catalysis , activity coefficient , non random two liquid model , phase diagram , physics , computer science , programming language , phase (matter) , engineering
During biodiesel production, the product is contaminated with impurities such as some non‐reacted alcohol, glycerol, and catalyst. In order to comply with product requirements, these impurities must be removed, for example, by washing with water. Knowledge of the extent of water solubility in biodiesel is required to design the drying system and determine fuel quality. In the present work, the solubilities of water in biodiesels produced from sunflower and canola oils were measured within the temperature range of 24–60 °C. The solubility of water increased with increasing temperature and biodiesel unsaturation. The liquid–liquid equilibria of ternary systems of glycerol, methanol, and the above‐mentioned biodiesels were investigated experimentally at 20, 30, and 40 °C. The binodal curves were determined by using the cloud point titration method and the tie lines were measured by evaporating the methanol. Both binary and ternary data were modeled using the UNIQUAC model. The model showed good agreement with the data. Othmer‐Tobias correlations were applied and the corresponding constants were obtained. The results validated the consistency of the tie‐line data obtained experimentally.