Kinetics of the extraction of pyrene using carbon dioxide in dense phase.
Chemosphere
; 53(7): 789-93, 2003 Nov.
Article
em En
| MEDLINE
| ID: mdl-13129519
ABSTRACT
Bath extraction experiments of pyrene from two spiked soils with different textural composition (sandy, sandy-clay) were performed with near-critical and supercritical CO(2) at different pressures (7.5, 15, 20, 25 MPa) and temperatures (40, 50, 60 degrees C) in order to obtain mass transfer rate data. An empirical equation whose parameters depend on type of soil but are independent of pressure and temperature is proposed. The comparison between individual mass transfer coefficients shows that the extraction is controlled by the resistance within the particle. Effective diffusivities between 0.4 and 6.0 x 10(-10) m(2)/s are deduced.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Pirenos
/
Solo
/
Dióxido de Carbono
Idioma:
En
Revista:
Chemosphere
Ano de publicação:
2003
Tipo de documento:
Article
País de afiliação:
Espanha