Kinetic Model and Mechanism of Ultrasonic-Enhanced Subcritical CO_2 Extraction

doi:10.3969/j.issn.1000-565X.2010.12.024

Journal of South China University of Technology (Natural Science Edition) ›› 2010, Vol. 38 ›› Issue (12): 124-128.doi: 10.3969/j.issn.1000-565X.2010.12.024

• Food Science & Technology • Previous Articles Next Articles

Kinetic Model and Mechanism of Ultrasonic-Enhanced Subcritical CO_2 Extraction

Qiu Tai-qiu¹ Li Chao² Tan Wei³ Yang Ri-fu¹ Huang Xing-xin¹ Fan Xiao-dan

1.School of Light Industry and Food Sciences,South China University of Technology,Guangzhou 510640,Guangdong,China;2.College of Food Engineering,Xuzhou Institute of Technology,Xuzhou 221008,Jiangsu,China;3.Faculty of Chemical Engineering and Light Industry,Guangdong University of Technology,Guangzhou 510006,Guangdong,China

Received:2010-05-24 Revised:2010-08-22 Online:2010-12-25 Published:2010-12-25
Contact: 丘泰球（1941-），男，教授，博士生导师，主要从事天然产物分离纯化新技术新方法研究． E-mail:tqqiu@scut．edu．cn
About author:丘泰球（1941-），男，教授，博士生导师，主要从事天然产物分离纯化新技术新方法研究．
Supported by:
国家“十一五”科技支撑计划重点项目（2006BAD27B03）

Abstract

Abstract:

In order to reveal the enhancement mechanism of subcritical CO₂ extraction by ultrasonic and describe the mass transfer enhanced with ultrasonic,some experiments were carried out and the data were fitted with the help of a kinetic extraction model.Then,the cavitations threshold at variable temperature and pressure were obtained based on theoretical calculation.Moreover,the cativation in the subcriticalCO₂ extraction enhanced by ultrasonic was investigated according to the results of the experiments.The results show that（1） the established kinetic model fits the extraction data well;（2） the difference in E∞ and k values between the extractions with and without ultrasonic enhancement also confirm the obvious enhancement effect of ultrasonic for the mass transfer in subcritical CO₂ extraction;（3） the occurrence of ultrasonic cavitation is rather easy at relatively high temperature and low pressure;（4） the cavitation occurs even under the conditions that cavitation is theoretically unavailable,for which there is no reasonable explanation;and（5） the enhancement is mainly due to the cavitation effect and the enhanced mass transfer.

Key words: ultrasonic, subcritical CO₂ extraction, kinetic model, mechanism

Qiu Tai-qiu Li Chao Tan Wei Yang Ri-fu Huang Xing-xin Fan Xiao-dan. Kinetic Model and Mechanism of Ultrasonic-Enhanced Subcritical CO_2 Extraction[J]. Journal of South China University of Technology (Natural Science Edition), 2010, 38(12): 124-128.

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Kinetic Model and Mechanism of Ultrasonic-Enhanced Subcritical CO_2 Extraction

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