کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
640906 1456986 2014 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Pressure-dependent kinetic modeling of solid–liquid extraction of the major green tea constituents
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Pressure-dependent kinetic modeling of solid–liquid extraction of the major green tea constituents
چکیده انگلیسی


• Effect of pressure on extraction kinetics of major green tea constituents was reported.
• The yields of major green tea constituents were increased with increasing pressure.
• So and Macdonald’s model was suitable to fit the experimental data.

The main aim of this work was to model the extraction process of the major green tea constituents in order to quantify the influence of the pressure on extraction kinetics. The kinetics of solid–liquid extraction of total catechins and caffeine at several pressures (200, 300, 400 and 500 MPa) were carried out using 50% aqueous ethanol. So and Macdonald’s model involving the concept of broken and intact cells in order to describe three successive extraction periods: an initial very fast washing stage, a fast diffusion stage and a slow diffusion stage, was successfully developed for describing the mechanism of solid–liquid extraction of the major green tea constituents under different pressures. From the modeling results, the influence of the pressure on the extraction yields of total catechins and caffeine of the various stages at equilibrium, and the mass transfer coefficient were identified.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Separation and Purification Technology - Volume 133, 8 September 2014, Pages 155–159
نویسندگان
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