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摘要
In order to realize the accurate description of the extraction process of continuous countercurrent extraction (CCE)for Astragalus polysaccharides, a mathematical model of diffusion and backmixing was established and solved. The two-phase solute distribution in the single-flow continuous countercurrent extractor was described. The scale for describing the pilot scale was established. The diffusion back-mixing numerical model of the two-phase solute distribution in the extractor was tested by multi-effect simulation CCE of Astragalus polysaccharides. The results showed that the extraction temperature was 40 ?70 °C, and the solid-liquid ratio was 1 : 6?1 : 14 (g/mL), within the single factor variation range of extraction time 40~ 70 min, the relative error between the model prediction distribution and the actual sample concentration is controlled &15%, which has certain practical value. The model can realize the achieve prediction of the concentration of the two phases in the extraction process of CCE under steady state conditions. ? 2020 Editorial Department of Food and Machinery, shipin yu jixie.
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