Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10278649 | Journal of Food Engineering | 2005 | 10 Pages |
Abstract
The extraction of nimbin from neem seeds using supercritical carbon dioxide is investigated in this paper. A model that accounts for intraparticle diffusion (De) and external mass transfer of nimbin (kf) is presented for the supercritical extraction process. Mass transfer is based on local equilibrium adsorption between solute (nimbin) and solid (neem solid). The external mass transfer coefficient was determined by fitting the theoretical extraction curve to experimental data. The following range of conditions: 0.24-1.24Â cm3/min of CO2, 10-26Â MPa, 308-333Â K, 1.0-2.5Â g of neem kernel powder and 0.0575-0.185Â cm of particle size of neem kernel powder, were considered. In addition, a new correlation for Sherwood number (Sh) was developed in terms of the dimensionless groups; Reynolds number (Re) and Schmidt number (Sc) from optimisation results. This correlation was compared to previous correlations and was found to give superior results when compared to experimental data.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Dayin Mongkholkhajornsilp, Supaporn Douglas, Peter L. Douglas, Ali Elkamel, Wittaya Teppaitoon, Suwassa Pongamphai,