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Modeling of supercritical extraction of organics from solid matrices
Author(s) -
Madras Giridhar,
Thibaud Catherine,
Erkey Can,
Akgerman Aydin
Publication year - 1994
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690400505
Subject(s) - orthogonal collocation , supercritical fluid , mass transfer , dispersion (optics) , supercritical fluid extraction , diffusion , desorption , supercritical carbon dioxide , adsorption , extraction (chemistry) , activated carbon , phase (matter) , chemistry , thermodynamics , partial differential equation , particle (ecology) , materials science , chromatography , differential equation , collocation method , organic chemistry , mathematics , ordinary differential equation , physics , mathematical analysis , oceanography , geology , optics
The desorption profiles of various organics from soil and activated carbon using dense liquid and supercritical carbon dioxide were modeled. The model accounts for effective diffusion of the organics in the solid pores, axial dispersion in the fluid phase, and external mass transfer to the fluid phase from the particle surface. This model, involving partial differential equations, is solved using the orthogonal collocation on finite elements. The model is able to predict the experimental data quite well without any adjustable parameters. The importance of each parameter depended on the system, although adsorption equilibrium and the effective pore diffusion of the organic were the most significant parameters in all the systems investigated.