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International Journal of Scientific and Engineering Research
ISSN Online 2229-5518
ISSN Print: 2229-5518 5    
Website: http://www.ijser.org
scirp IJSER >> Volume 3,Issue 5,May 2012
The Backmixing-Diffusion Concept for Mass Transport Phenomena of Pineapple Juice Extraction Using a Reversing Continuous Countercurrent Extractor
Full Text(PDF, )  PP.194-203  
Author(s)
Chairat Siripatana, Waigoon Rittirut, Thummarat Thummadetsak
KEYWORDS
— backmixing, countercurrent extraction, pineapple juice, reversing continuous countercurrent extractor, RCCE, solid-liquid diffusion
ABSTRACT
A backmixing-diffusion model was developed and proposed to describe the mass transport in a reversing continuous countercurrent extrac-tor (RCCE) at steady-state condition. Three variables namely draft, retention time, and extraction temperature were studied according to various experimental trials. Equilibrium distribution coefficient and solute diffusivity were important parameters introduced to predict concentration profiles for both liquid and solid phases. It was found that backmixing-diffusion concept can be applied through the studied range of operation time. The differences between experimental data and the predictions for concentration profiles were due to the variations in Biot number and Peclet number along the length of extraction unit. Nevertheless, the simulation was successful for pineapple juice extraction process.
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