The dynamic behaviour of liquid-liquid agitated dispersions—II. Coupled hydrodynamics and mass transfer

Ribeiro, Lígia Maria; Regueiras, P.F.R.; Guimarães, M.M.L.; Madureira, C.M.N.; Cruz-Pinto, J.J.C.

doi:10.1016/s0098-1354(96)00283-9

Cited by 19 publications

(19 citation statements)

References 9 publications

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“…Di erent authors use di erent exponents for the Weber number (Fernandes & Sharma, 1967;Godfrey, Obi, & Reeve, 1989). These disagreements are related to the fact that all the phenomena associated with interfacial area formation are not yet fully understood, namely the break-up and coalescence e ects (Ribeiro, Regueiras, Guimarães, Madureira, & Cruz-Pinto, 1997;Balmelli, Steiner, & Hartland, 2000;Lasheras, Eastwood, MartÃ nez-BazÃ an, & MontañÃ es, 2002). The ow regime in the vessel is also relevant.…”

Section: Introductionmentioning

confidence: 99%

Effective interfacial area in agitated liquid–liquid continuous reactors

Quadros

Baptista

2003

Chemical Engineering Science

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A chemical method has been used to quantify the e ective interfacial area in a ba ed continuous stirred liquid-liquid reactor. Two and four straight paddle impellers were used in the experimental runs, at 34• C, with hold-up fractions of dispersed organic phase between 0.061 and 0.166 and stirring speed ranging from 360 to 1500 rpm. In uence of the residence time on the formation of the interfacial area generated in this system was not registered; however, di erences were reported between continuous and batch mode operations.The interfacial area was correlated to hold-up fraction and Weber number by a new empirical model proposed in this work. This model allows to use only one equation to calculate the interfacial area in this continuous stirred reactor in the wide range of operating conditions tested (490 ¡ We ¡ 9600), which include di erent ow regimes. This is a relevant contribution as previous studies in this ÿeld only contemplate turbulent ow. In the transitional regime the mean drop size diameter decreases abruptly with Weber number, but this pattern changes in the higher range of Weber where the dispersed drops become smaller very smoothly. This pattern does not depend on the agitator used or hold-up fraction. The mean drop size diameter is smaller for the four paddle impeller and increases with hold-up fraction. The model developed may be applicable to dispersions in aromatic nitration reactors, improving its operation and design. ?

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Section: Introductionmentioning

confidence: 99%

Effective interfacial area in agitated liquid–liquid continuous reactors

Quadros

Baptista

2003

Chemical Engineering Science

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“…(1)) phases, respectively, and is given by Attarakih et al (2004a). Moreover, in the above derivation the droplet interaction mechanisms are considered fast when compared to the mass transfer (Ribeiro et al, 1997). This means that the mass transfer is considered to take place only during the droplet motion in the continuous phase and the resulting droplets from either droplet breakage or coalescence are considered to have uniform solute concentrations.…”

Section: Hydrodynamics and Mass Transfer Of The Continuous Phasementioning

confidence: 99%

“…The overall mass transfer coefficient is usually expressed using the two-resistance theory in terms of the individual mass transfer coefficients for the continuous and the dispersed phases (Ribeiro et al, 1997) and c * y = (jc y /jc x )c x . To complete the mathematical model described above, boundary and initial conditions are required.…”

Section: Mass Transfer Coefficientsmentioning

confidence: 99%

Numerical solution of the bivariate population balance equation for the interacting hydrodynamics and mass transfer in liquid–liquid extraction columns

Attarakih

Bart

Faqir

2006

Chemical Engineering Science

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“…Due to the high complexity and cost of the direct experimentation using such equipments, computer simulation becomes very attractive. Algorithms for fast and reliable simulation of single stirred vessels and extraction columns have already been published by some of the present authors, both for steady-state and dynamic conditions [12,11,[3][4][5]14,15].…”

Section: Introductionmentioning

confidence: 99%