The Diffusion Kinetics Equation of Microwave-Assisted Extraction

Abstract:

In order to make adequate use of microwave to enhance extraction efficiency, the diffusion kinetics equation of microwave-assisted extraction was established on the basis of the theory of the liquid lattice model. By simplifying the diffusion kinetics equation, three simple relational expressions were obtained, which contained three experimental parameters (the extraction time, the liquid/material ratio and the particle radius, respectively). The fitting results showed that the theory curves were consentaneous to experiment results and all the related coefficient in fitting results were above 0.97 , which indicated that the kinetics model established is adaptive and appropriate in some range. Through further analyzing the fitting curves, it was indicated that the relation curves had different characteristics that one characteristic was the extraction rate obviously changed and the other was the extraction rate changed very slowly, which could provide a definite guidance for selecting the experimental parameters such as extraction duration, liquid/material ratio and particle radius in the extraction process.

• Periodical: Advanced Materials Research (Volumes 560-561)
• Pages: 107-116
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.560-561.107
• Online since: August 2012
• Authors: Hai Li Liu, Ping Sheng Guo
• Keywords: Diffusion Kinetics Equation, Experimental Parameter, Fitting Curves, Microwave-Assisted Extraction (MAE), Non-Calorific Energy, Particle Boundary Layer

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