کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1205837 1493675 2012 25 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Theoretical models for supercritical fluid extraction
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
Theoretical models for supercritical fluid extraction
چکیده انگلیسی

For the proper design of supercritical fluid extraction processes, it is essential to have a sound knowledge of the mass transfer mechanism of the extraction process and the appropriate mathematical representation. In this paper, the advances and applications of kinetic models for describing supercritical fluid extraction from various solid matrices have been presented. The theoretical models overviewed here include the hot ball diffusion, broken and intact cell, shrinking core and some relatively simple models. Mathematical representations of these models have been in detail interpreted as well as their assumptions, parameter identifications and application examples. Extraction process of the analyte solute from the solid matrix by means of supercritical fluid includes the dissolution of the analyte from the solid, the analyte diffusion in the matrix and its transport to the bulk supercritical fluid. Mechanisms involved in a mass transfer model are discussed in terms of external mass transfer resistance, internal mass transfer resistance, solute–solid interactions and axial dispersion. The correlations of the external mass transfer coefficient and axial dispersion coefficient with certain dimensionless numbers are also discussed. Among these models, the broken and intact cell model seems to be the most relevant mathematical model as it is able to provide realistic description of the plant material structure for better understanding the mass-transfer kinetics and thus it has been widely employed for modeling supercritical fluid extraction of natural matters.


► Kinetic models for describing supercritical fluid extraction are overviewed.
► Model representations, assumptions, parameter identifications and uses are interpreted.
► Mass transfer resistances, solute–solid interaction and axial dispersion are discussed.
► The broken and intact cell model seems to be more preferably used for scaling-up.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Chromatography A - Volume 1250, 10 August 2012, Pages 2–26
نویسندگان
, , ,