Influence of Electrolytes and High Viscosity on Liquid-Liquid Separation
Liquid-liquid extraction is a process using two immiscible
liquids to extract compounds from one phase without high
temperature requirement. Mostly, the technical implementation of
this process is carried out in mixer-settlers or extraction columns. In
real chemical processes, chemicals may have high viscosity and
contain impurities. These impurities may change the settling behavior
of the process without measurably changing the physical properties
of the phases. In the current study, the settling behavior and the affected
parameters in a high-viscosity system were observed. Batchsettling
experiments were performed to experimentally quantify the
settling behavior and the mixer-settler model of Henschke [1] was
used to evaluate the behavior of the toluene + water system. The
viscosity of the system was increased by adding polyethylene glycol
4000 to the aqueous phase. NaCl and Na2SO4 were used to study the
influence of electrolytes. The results from this study show that increasing
the viscosity of water has a higher influence on the settling
behavior in comparison to the effects of the electrolytes. It can be
seen from the experiments that at high salt concentrations, there was
no effect on the settling behavior.
[1] Henschke, M., 1994: Dimensionierung liegender Fl├╝ssig-fl├╝ssig-
Abscheider anhand diskontinuierlicher Absetzversuche. Lehrstuhl f├╝r
Thermische Verfahrenstechnik. RWTH Aachen University, Germany.
[2] Henschke M., Schlieper L. H., Pfennig A., 2002: Determination of a
coalescence parameter from batch-settling experiments. Chem.Eng. J.
85, 369-378.
[3] Jeelani S. A. K., Hartland S., 1985: Prediction of Steady State Height
from Batch Settling Dispersion Data. AlChE J. Vol. 31, No. 5, 711-720.
[4] Effertz M., 2011: Experimentelle Untersuchung des Einflusses von
Salzen auf das Phasentrennverhalten von MiBK + Wasser. Studienarbeit,
AVT.TVT, RWTH Aachen University, Germany.
[5] Pilhofer, T., D. Mewes, 1979: Siebboden Extraktionskolonnen, Verlag
Chemie, Weinheim, Germany.
[6] Ishii M., Zuber N., 1979: Drag coefficient and relative velocity in bubbly,
droplet or particulate flows, AIChE J. 25 (5), 843-855.
[7] Manodumrongthum S., 2012: Experimental studies on settling behavior
of different high-viscous systems. Bachelor thesis, AVT.TVT, RWTH
Aachen University, Germany.
[8] Pfennig A., Schwerin A., 1998: Influence of electrolytes on liquid-liquid
extraction. Ind. Eng. Chem. Res. 37, 3180-3188.
[9] Soika M., Pfennig A., 2005: Extraktion Eine Frage des Wassers. Chem.
Ing.Tech. 77 No.7, 905-911.
[1] Henschke, M., 1994: Dimensionierung liegender Fl├╝ssig-fl├╝ssig-
Abscheider anhand diskontinuierlicher Absetzversuche. Lehrstuhl f├╝r
Thermische Verfahrenstechnik. RWTH Aachen University, Germany.
[2] Henschke M., Schlieper L. H., Pfennig A., 2002: Determination of a
coalescence parameter from batch-settling experiments. Chem.Eng. J.
85, 369-378.
[3] Jeelani S. A. K., Hartland S., 1985: Prediction of Steady State Height
from Batch Settling Dispersion Data. AlChE J. Vol. 31, No. 5, 711-720.
[4] Effertz M., 2011: Experimentelle Untersuchung des Einflusses von
Salzen auf das Phasentrennverhalten von MiBK + Wasser. Studienarbeit,
AVT.TVT, RWTH Aachen University, Germany.
[5] Pilhofer, T., D. Mewes, 1979: Siebboden Extraktionskolonnen, Verlag
Chemie, Weinheim, Germany.
[6] Ishii M., Zuber N., 1979: Drag coefficient and relative velocity in bubbly,
droplet or particulate flows, AIChE J. 25 (5), 843-855.
[7] Manodumrongthum S., 2012: Experimental studies on settling behavior
of different high-viscous systems. Bachelor thesis, AVT.TVT, RWTH
Aachen University, Germany.
[8] Pfennig A., Schwerin A., 1998: Influence of electrolytes on liquid-liquid
extraction. Ind. Eng. Chem. Res. 37, 3180-3188.
[9] Soika M., Pfennig A., 2005: Extraktion Eine Frage des Wassers. Chem.
Ing.Tech. 77 No.7, 905-911.
@article{"International Journal of Chemical, Materials and Biomolecular Sciences:61063", author = "K. Anusarn and P. Chuttrakul and M. Schmidt and T. Kangsadan and A. Pfennig", title = "Influence of Electrolytes and High Viscosity on Liquid-Liquid Separation", abstract = "Liquid-liquid extraction is a process using two immiscible
liquids to extract compounds from one phase without high
temperature requirement. Mostly, the technical implementation of
this process is carried out in mixer-settlers or extraction columns. In
real chemical processes, chemicals may have high viscosity and
contain impurities. These impurities may change the settling behavior
of the process without measurably changing the physical properties
of the phases. In the current study, the settling behavior and the affected
parameters in a high-viscosity system were observed. Batchsettling
experiments were performed to experimentally quantify the
settling behavior and the mixer-settler model of Henschke [1] was
used to evaluate the behavior of the toluene + water system. The
viscosity of the system was increased by adding polyethylene glycol
4000 to the aqueous phase. NaCl and Na2SO4 were used to study the
influence of electrolytes. The results from this study show that increasing
the viscosity of water has a higher influence on the settling
behavior in comparison to the effects of the electrolytes. It can be
seen from the experiments that at high salt concentrations, there was
no effect on the settling behavior.", keywords = "Coalescence; electrolytes; liquid-liquid separation;
high viscosity; mixer- settler.", volume = "6", number = "12", pages = "1175-5", }