Premium
Solubility correlation of gall ( Quercus infectoria ) extract in supercritical CO 2 using semi‐empirical equations
Author(s) -
Mohd Nasir Hasmida,
Md Salleh Liza,
Ismail Ahmad Ramdan,
Machmudah Siti
Publication year - 2017
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.2118
Subject(s) - solubility , supercritical carbon dioxide , chemistry , supercritical fluid , analytical chemistry (journal) , extraction (chemistry) , chromatography , thermodynamics , physics , organic chemistry
Abstract The present work studied the solubilities of Quercus infectoria gall extract in supercritical carbon dioxide (SC‐CO 2 ) system with the addition of methanol as polarity enhancer. Experimentally, the galls were extracted using SC‐CO 2 at different operating pressures (20 to 30 MPa) and temperatures (50 to 70 °C). Six semi‐empirical equations (Chrastil, Adachi‐Lu, del Valle‐Aguilera, Sparks, Kumar‐Johnston and Bartle) were used to explain mathematically the solubility behaviour of the Q. infectoria gall extract. The results demonstrated that the extract solubility increases as pressure increases at fixed temperature, while at constant pressure, it increases with increasing temperature. Apparently, Bartle equation provides best correlation between experimental and calculated solubility data for gall extraction with high correlation coefficient, R 2 (0.96), and small absolute average relative deviation (1.52%). © 2017 Curtin University of Technology and John Wiley & Sons, Ltd.