کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
230929 1427409 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Optimization and mathematical modeling of mass transfer between Zostera marina residues and supercritical CO2 modified with ethanol
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Optimization and mathematical modeling of mass transfer between Zostera marina residues and supercritical CO2 modified with ethanol
چکیده انگلیسی

Supercritical CO2 extraction of phenolic compounds from Zostera marina residues was optimized by developing a mathematical model based on mass transfer balances. A linear driving force model was applied considering model parameters such as solute concentration on the surface of the solid (Cs) and in the supercritical fluid phase (Cf), film mass transfer coefficient (kf) and molecular diffusivity (DAB) and axial dispersion (Dax) coefficients. Henry's law was used to describe the equilibrium state of solid and fluid phases. The results of the proposed model were compared to that of the experimental data in terms of transport properties and extraction yield at various temperatures (303.15, 323.15, 353.15 K), pressures (15, 25, 35 MPa) and co-solvent mass ratios (0, 10, 20%). The optimum parameters were elicited as 25 MPa, 353.15 K and a co-solvent ratio of 20% yielding 77.22 μg g−1 dry feed. The model satisfactorily described the extraction yield which can be used for scale-up purposes.

Figure optionsDownload as PowerPoint slideHighlights
► Zostera marina residues were subjected to supercritical fluid extraction.
► A linear driving force model was used based on mass transfer balances.
► The optimum parameters were elicited as 25 MPa, 353.15 K and a co-solvent ratio of 20% yielding 77.22 μg g−1 dry feed.
► The model satisfactorily described the extraction yield which can be used for scale-up purposes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: The Journal of Supercritical Fluids - Volume 68, August 2012, Pages 87–93
نویسندگان
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