Mohd. Nasir, H. and Md. Salleh, L. and Ismail, A. R. and Machmudah, S. (2017) Solubility correlation of gall (Quercus infectoria) extract in supercritical CO2 using semi-empirical equations. Asia-Pacific Journal of Chemical Engineering, 12 (5). pp. 790-797. ISSN 1932-2135
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Abstract
The present work studied the solubilities of Quercus infectoria gall extract in supercritical carbon dioxide (SC-CO2) system with the addition of methanol as polarity enhancer. Experimentally, the galls were extracted using SC-CO2 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, R2 (0.96), and small absolute average relative deviation (1.52%).
Item Type: | Article |
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Uncontrolled Keywords: | Extraction, Quercus infectoria, semi-empirical equations, solubility, supercritical carbon dioxide |
Subjects: | T Technology > TP Chemical technology |
Divisions: | Chemical and Energy Engineering |
ID Code: | 75417 |
Deposited By: | Widya Wahid |
Deposited On: | 22 Mar 2018 11:08 |
Last Modified: | 22 Mar 2018 11:08 |
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