Abstract
For the dynamic behavior in the super- or near-critical CO2 extraction of essential oil components (carvone and limonene) from spearmint leaves, a mass transfer model was developed on the basis of intraparticle diffusion and external mass transfer. The effects of temperature, pressure, and CO2 mass flow-rate on the model parameters which are the intraparticle effective diffusion and the external mass transfer coefficients, were investigated. Good agreement between the prediction by the model and the experimental data was obtained. When increasing the CO2 pressure, the intraparticle effective diffusion coefficients mostly increased and the external mass transfer coefficients significantly increased by showing the enhanced mass transfer at an increased CO2 density at a higher pressure. The effects of CO2 flow rate on the extent of the extraction rate and external mass transfer coefficient were negligible. Also, the Biot numbers determined for the extraction runs were generally much larger than 5, which indicates the predominance of the internal mass transfer resistance over the external mass transfer resistance. The intraparticle effective diffusion coefficients estimated from the extraction data were markedly smaller than the molecular diffusivities determined by empirical estimation methods. Therefore, this study suggests the significance of the intraparticle mass transfer resistance in the CO2 extraction of spearmint leaves, which implies that the complex matrix structure of the herbaceous spearmint leaf hinders the mass transfer inside leaf particles during the extraction process.
| Original language | English |
|---|---|
| Pages (from-to) | 2271-2288 |
| Number of pages | 18 |
| Journal | Separation Science and Technology |
| Volume | 37 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 2002 Jul 17 |
| Externally published | Yes |
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Keywords
- Carbon dioxide
- Extraction
- Intraparticle diffusion
- Near-critical
- Spearmint oil
- Supercritical
ASJC Scopus subject areas
- Chemical Engineering(all)
- Filtration and Separation
- Process Chemistry and Technology
- Chemistry(all)
Cite this
A mass transfer model for super- and near-critical CO2 extraction of spearmint leaf oil. / Kim, Kyoung Heon; Hong, Juan.
In: Separation Science and Technology, Vol. 37, No. 10, 17.07.2002, p. 2271-2288.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - A mass transfer model for super- and near-critical CO2 extraction of spearmint leaf oil
AU - Kim, Kyoung Heon
AU - Hong, Juan
PY - 2002/7/17
Y1 - 2002/7/17
N2 - For the dynamic behavior in the super- or near-critical CO2 extraction of essential oil components (carvone and limonene) from spearmint leaves, a mass transfer model was developed on the basis of intraparticle diffusion and external mass transfer. The effects of temperature, pressure, and CO2 mass flow-rate on the model parameters which are the intraparticle effective diffusion and the external mass transfer coefficients, were investigated. Good agreement between the prediction by the model and the experimental data was obtained. When increasing the CO2 pressure, the intraparticle effective diffusion coefficients mostly increased and the external mass transfer coefficients significantly increased by showing the enhanced mass transfer at an increased CO2 density at a higher pressure. The effects of CO2 flow rate on the extent of the extraction rate and external mass transfer coefficient were negligible. Also, the Biot numbers determined for the extraction runs were generally much larger than 5, which indicates the predominance of the internal mass transfer resistance over the external mass transfer resistance. The intraparticle effective diffusion coefficients estimated from the extraction data were markedly smaller than the molecular diffusivities determined by empirical estimation methods. Therefore, this study suggests the significance of the intraparticle mass transfer resistance in the CO2 extraction of spearmint leaves, which implies that the complex matrix structure of the herbaceous spearmint leaf hinders the mass transfer inside leaf particles during the extraction process.
AB - For the dynamic behavior in the super- or near-critical CO2 extraction of essential oil components (carvone and limonene) from spearmint leaves, a mass transfer model was developed on the basis of intraparticle diffusion and external mass transfer. The effects of temperature, pressure, and CO2 mass flow-rate on the model parameters which are the intraparticle effective diffusion and the external mass transfer coefficients, were investigated. Good agreement between the prediction by the model and the experimental data was obtained. When increasing the CO2 pressure, the intraparticle effective diffusion coefficients mostly increased and the external mass transfer coefficients significantly increased by showing the enhanced mass transfer at an increased CO2 density at a higher pressure. The effects of CO2 flow rate on the extent of the extraction rate and external mass transfer coefficient were negligible. Also, the Biot numbers determined for the extraction runs were generally much larger than 5, which indicates the predominance of the internal mass transfer resistance over the external mass transfer resistance. The intraparticle effective diffusion coefficients estimated from the extraction data were markedly smaller than the molecular diffusivities determined by empirical estimation methods. Therefore, this study suggests the significance of the intraparticle mass transfer resistance in the CO2 extraction of spearmint leaves, which implies that the complex matrix structure of the herbaceous spearmint leaf hinders the mass transfer inside leaf particles during the extraction process.
KW - Carbon dioxide
KW - Extraction
KW - Intraparticle diffusion
KW - Near-critical
KW - Spearmint oil
KW - Supercritical
UR - http://www.scopus.com/inward/record.url?scp=0036304207&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036304207&partnerID=8YFLogxK
U2 - 10.1081/SS-120003513
DO - 10.1081/SS-120003513
M3 - Article
AN - SCOPUS:0036304207
VL - 37
SP - 2271
EP - 2288
JO - Separation Science and Technology (Philadelphia)
JF - Separation Science and Technology (Philadelphia)
SN - 0149-6395
IS - 10
ER -