Mass transfer in countercurrent packed columns: Application to supercritical CO[sub 2] extraction of terpenes

Supercritical fluid extraction (SFE) is an alternative separation method to more conventional processes such as liquid extraction and distillation. However, up to now, few works have been devoted to the investigation of the efficiency of countercurrent packed columns under supercritical conditions f...

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Bibliographic Details
Published inIndustrial & engineering chemistry research Vol. 34:2
Main Authors Simoes, P.C., Matos, H.A., Carmelo, P.J., Gomes de Azevedo, E., Nunes da Ponte, M.
Format Journal Article
LanguageEnglish
Published United States 01.02.1995
Subjects
320303 - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Equipment & Processes
DESIGN
ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
EXTRACTION
EXTRACTION APPARATUSES
EXTRACTION COLUMNS
MASS BALANCE
MASS TRANSFER
MATHEMATICAL MODELS
ORGANIC COMPOUNDS
SEPARATION EQUIPMENT
SEPARATION PROCESSES
SOLVENT EXTRACTION
SUPERCRITICAL GAS EXTRACTION
TERPENES
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Summary:Supercritical fluid extraction (SFE) is an alternative separation method to more conventional processes such as liquid extraction and distillation. However, up to now, few works have been devoted to the investigation of the efficiency of countercurrent packed columns under supercritical conditions from a mass transfer point of view. Mass transfer in a countercurrent column, filled with structured gauze packing, was measured for the separation of a mixture of terpenes (d-limonene/1,8-cineole) by supercritical carbon dioxide, at 313 and 318 K and pressures up to 9 MPa. The extraction efficiency was determined in terms of the overall mass transfer coefficient. Operating lines for this process had an appreciable curvature due to a high miscibility of the two contacting phases. The real slope of these lines had to be estimated. Available mass transfer models for packed columns predicted efficiencies diverging to a great extent from the experimental results.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie00041a023