Abstract
Batch desorption experiments of vitamin E from silica were carried out to study the effects of reaction temperature and agitation rate on the kinetics and equilibrium of desorption. For all systems, it was found that vitamin E desorbed rapidly in the early stages, followed by a much slower release. The two distinct desorption rates might be due to the heterogeneities of the adsorbing surfaces. A first-order two-component four-parameter model described the desorption kinetics well with a coefficient of determination, R2 of >0.97. The rate constants for rapid (krap) and slow (k slow) desorption ranging from 0.51 to 2.23 min-1 and from 0.01 to 0.14 min-1, respectively, depending on reaction temperature and agitation rate. It was found that the krap value increased with increase in reaction temperature, indicating that desorption of vitamin E from silica was endothermic in nature. The desorption rate also increased with increase in agitation rate. Activation energies for the rapid and slow desorption were 38.64 and 73.08 kJmol-1, respectively. It was found that the desorption isotherm can be fitted by the Fruendlich model. Percentage recovery of vitamin E from silica ranged from 70.36% to 98.74%, depending on the experimental variables. The results from this study provided useful information for achieving high recovery of vitamin E during its separation using an adsorption method.
| Original language | English |
|---|---|
| Pages (from-to) | 1-7 |
| Number of pages | 7 |
| Journal | Journal of Food Engineering |
| Volume | 64 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Sep 2004 |
| Externally published | Yes |
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Separation of vitamin E from palm fatty acid distillate using silica. III. Batch desorption study. / Chu, B. S.; Baharin, B. S.; Che Man, Y. B.; Quek, S. Y.
In: Journal of Food Engineering, Vol. 64, No. 1, 09.2004, p. 1-7.Research output: Contribution to journal › Article
TY - JOUR
T1 - Separation of vitamin E from palm fatty acid distillate using silica. III. Batch desorption study
AU - Chu, B. S.
AU - Baharin, B. S.
AU - Che Man, Y. B.
AU - Quek, S. Y.
PY - 2004/9
Y1 - 2004/9
N2 - Batch desorption experiments of vitamin E from silica were carried out to study the effects of reaction temperature and agitation rate on the kinetics and equilibrium of desorption. For all systems, it was found that vitamin E desorbed rapidly in the early stages, followed by a much slower release. The two distinct desorption rates might be due to the heterogeneities of the adsorbing surfaces. A first-order two-component four-parameter model described the desorption kinetics well with a coefficient of determination, R2 of >0.97. The rate constants for rapid (krap) and slow (k slow) desorption ranging from 0.51 to 2.23 min-1 and from 0.01 to 0.14 min-1, respectively, depending on reaction temperature and agitation rate. It was found that the krap value increased with increase in reaction temperature, indicating that desorption of vitamin E from silica was endothermic in nature. The desorption rate also increased with increase in agitation rate. Activation energies for the rapid and slow desorption were 38.64 and 73.08 kJmol-1, respectively. It was found that the desorption isotherm can be fitted by the Fruendlich model. Percentage recovery of vitamin E from silica ranged from 70.36% to 98.74%, depending on the experimental variables. The results from this study provided useful information for achieving high recovery of vitamin E during its separation using an adsorption method.
AB - Batch desorption experiments of vitamin E from silica were carried out to study the effects of reaction temperature and agitation rate on the kinetics and equilibrium of desorption. For all systems, it was found that vitamin E desorbed rapidly in the early stages, followed by a much slower release. The two distinct desorption rates might be due to the heterogeneities of the adsorbing surfaces. A first-order two-component four-parameter model described the desorption kinetics well with a coefficient of determination, R2 of >0.97. The rate constants for rapid (krap) and slow (k slow) desorption ranging from 0.51 to 2.23 min-1 and from 0.01 to 0.14 min-1, respectively, depending on reaction temperature and agitation rate. It was found that the krap value increased with increase in reaction temperature, indicating that desorption of vitamin E from silica was endothermic in nature. The desorption rate also increased with increase in agitation rate. Activation energies for the rapid and slow desorption were 38.64 and 73.08 kJmol-1, respectively. It was found that the desorption isotherm can be fitted by the Fruendlich model. Percentage recovery of vitamin E from silica ranged from 70.36% to 98.74%, depending on the experimental variables. The results from this study provided useful information for achieving high recovery of vitamin E during its separation using an adsorption method.
U2 - 10.1016/S0260-8774(03)00198-5
DO - 10.1016/S0260-8774(03)00198-5
M3 - Article
AN - SCOPUS:1442335061
VL - 64
SP - 1
EP - 7
JO - Journal of Food Engineering
JF - Journal of Food Engineering
SN - 0260-8774
IS - 1
ER -