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Abstract:

Liquid-phase hydrodynamics is studied in a three-phase fixed bed with cocurrent upflow of gas and liquid. Residence-time distributions are measured to determine liquid hold-up and backmixing using different liquids and glass beads of two sizes. Two types of correlations are tested for liquid saturation. Correlations based on the drift flux concept are found to account for experimental results. Liquid mixing is described in terms of the axial dispersion model. A close relation between the axial dispersion coefficient and the bubbles sizes estimated using the theory of fluid emulsions is found. Hence, a new type of correlation is proposed to estimate axial dispersion coefficients in this type of reactors. This correlation considers the influences on the Peclet number of the liquid Reynolds number and the two-phase flow dissipation power rate, which would determine bubbles sizes. Liquid-phase hydrodynamics is studied in a three-phase fixed bed with cocurrent upflow of gas and liquid. Residence-time distributions are measured to determine liquid hold-up and backmixing using different liquids and glass beads of two sizes. Two types of correlations are tested for liquid saturation. Correlations based on the drift flux concept are found to account for experimental results. Liquid mixing is described in terms of the axial dispersion model. A close relation between the axial dispersion coefficient and the bubbles sizes estimated using the theory of fluid emulsions is found. Hence, a new type of correlation is proposed to estimate axial dispersion coefficients in this type of reactors. This correlation considers the influences on the Peclet number of the liquid Reynolds number and the two-phase flow dissipation power rate, which would determine bubbles sizes.

Registro:

Documento: Artículo
Título:Liquid hold-up and backmixing in cocurrent upflow three-phase fixed-bed reactors
Autor:Cassanello, M.; Martínez, O.; Cukierman, A.L.
Ciudad:Exeter, United Kingdom
Filiación:Fac. de Cie. Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, 1428 Buenos Aires, Argentina
Depto. de Ing. Química, Facultad de Ingeniería, Universidad Nacional de La Plata, Calle 1 esq. 47, 1900, La Plata, Argentina
CINDECA, Universidad Nacional de La Plata, CONICET, Calle 47, No. 257, CC 59, 1900, La Plata, Argentina
Palabras clave:Back-mixing; Fixed-beds; Hydrodynamics; Liquid holdup; Three-phase reactors; Bubbles (in fluids); Hydrodynamics; Mathematical models; Mixing; Reynolds number; Two phase flow; Axial dispersion model; Backmixing; Fixed bed reactors; Liquid hold up; Chemical reactors; hydrodynamics; mixing; reactor; three-phase flow
Año:1998
Volumen:53
Número:5
Página de inicio:1015
Página de fin:1025
DOI: http://dx.doi.org/10.1016/S0009-2509(97)00196-6
Título revista:Chemical Engineering Science
Título revista abreviado:Chem. Eng. Sci.
ISSN:00092509
CODEN:CESCA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00092509_v53_n5_p1015_Cassanello

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Citas:

---------- APA ----------
Cassanello, M., Martínez, O. & Cukierman, A.L. (1998) . Liquid hold-up and backmixing in cocurrent upflow three-phase fixed-bed reactors. Chemical Engineering Science, 53(5), 1015-1025.
http://dx.doi.org/10.1016/S0009-2509(97)00196-6
---------- CHICAGO ----------
Cassanello, M., Martínez, O., Cukierman, A.L. "Liquid hold-up and backmixing in cocurrent upflow three-phase fixed-bed reactors" . Chemical Engineering Science 53, no. 5 (1998) : 1015-1025.
http://dx.doi.org/10.1016/S0009-2509(97)00196-6
---------- MLA ----------
Cassanello, M., Martínez, O., Cukierman, A.L. "Liquid hold-up and backmixing in cocurrent upflow three-phase fixed-bed reactors" . Chemical Engineering Science, vol. 53, no. 5, 1998, pp. 1015-1025.
http://dx.doi.org/10.1016/S0009-2509(97)00196-6
---------- VANCOUVER ----------
Cassanello, M., Martínez, O., Cukierman, A.L. Liquid hold-up and backmixing in cocurrent upflow three-phase fixed-bed reactors. Chem. Eng. Sci. 1998;53(5):1015-1025.
http://dx.doi.org/10.1016/S0009-2509(97)00196-6