华南理工大学学报(自然科学版) ›› 2010, Vol. 38 ›› Issue (12): 124-128.doi: 10.3969/j.issn.1000-565X.2010.12.024

• 食品科学与技术 • 上一篇    下一篇

超声强化亚临界CO2萃取的动力学模型及机理

丘泰球1  李超2 谭伟3 杨日福1  黄星歆1  范晓丹1   

  1. 1. 华南理工大学 轻工与食品学院, 广东 广州 510640; 2. 徐州工程学院 食品工程学院, 江苏 徐州 221008; 3. 广东工业大学 轻工化工学院, 广东 广州 510006
  • 收稿日期:2010-05-24 修回日期:2010-08-22 出版日期:2010-12-25 发布日期:2010-12-25
  • 通信作者: 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
  • 作者简介: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.
  • 基金资助:

    国家“十一五”科技支撑计划重点项目(2006BAD27B03)

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. 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)

摘要: 为了研究超声强化亚临界CO2萃取的机理,说明超声对亚临界CO2萃取的传质强化效果,借助萃取动力学模型对实验数据进行了拟合,并通过超声空化阈值的理论计算,得到亚临界CO2的空化阈值随温度和压力的变化,同时结合超声空化的验证实验,探讨了超声在亚临界CO2中的空化情况.结果表明:动力学方程能够较好地拟合萃取实验结果,模型方程中有无超声的E∞和k值的差异也证实了超声对亚临界CO2萃取有明显的传质强化效果;相对较高的温度和较低的压力更有利于超声空化效应的产生;亚临界CO2在理论计算不可能出现超声空化的条件下同样存在空化效应,此现象尚无合理的解释;超声强化亚临界CO2萃取的机理包括空化效应和强化传质.

关键词: 超声波, 亚临界CO2萃取, 动力学模型, 机理

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