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7 - Intensification of Liquid–Liquid Coalescence

Published online by Cambridge University Press:  12 May 2020

Laurence R. Weatherley
Affiliation:
University of Kansas
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Summary

The importance of coalescence for efficient application of extraction and reaction engineering involving liquid–liquid mixtures is reviewed, with an emphasis on the role of intensification techniques for improvement. Discussion of gravity settling is used as a starting point, which then extends into the role of solid surfaces, such as fibers, in promoting coalescence. The physical mechanisms which control interactions between drops that then lead to coalescence are then reviewed. These include collision frequency, interfacial drainage, the role of van der Waals forces, and dynamic changes in drop geometry. A brief introduction to population balance modeling for prediction of coalescence rates is presented. The application of electrostatics to intensification of coalescence is analyzed, with a short summary of the controlling relationships. Recent developments in the application of surfactants and electrolytes for the enhancement of coalescence are also reviewed, together with an overview of controlling equations. Other intensification techniques that are briefly reviewed include the application of ultrasonic fields, phase-inversion techniques, and the use of membranes.

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Publisher: Cambridge University Press
Print publication year: 2020

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References

Aarts, G., and Lekkerkerker, H. N. (2008). Droplet coalescence: drainage, film rupture and neck growth in ultralow interfacial tension systems. Journal of Fluid Mechanics, 606, 275294.CrossRefGoogle Scholar
Aarts, G., Lekkerkerker, N., Guo, H., Wegdam, G. H., and Bonn, D. (2005). Hydrodynamics of droplet coalescence. Physical Review Letters, 95, 164503.CrossRefGoogle ScholarPubMed
Allen, R. S., Charles, G. E., and Mason, S. G. (1960). The approach of gas bubbles to a gas/liquid interface. Journal of Colloid Science, 16(2), 150165.Google Scholar
Antes, F. G., Diehl, L. O., Pereira, J. S. F., et al. (2017). Effect of ultrasonic frequency on separation of water from heavy crude oil emulsion using ultrasonic baths. Ultrasonics Sonochemistry, 35, 541546.CrossRefGoogle ScholarPubMed
Bak, A. and Podgorska, W. (2012). Investigation of drop breakage and coalescence in the liquid–liquid system with nonionic surfactants Tween20 and Tween80. Chemical Engineering Science, 74, 181191.Google Scholar
Borrell, M., Yoon, Y., and Leal, L. G. (2004). Experimental analysis of the coalescence process via head-on collisions in a time-dependent flow. Physics of Fluids, 16(11), 39453954.CrossRefGoogle Scholar
Brown, A. H. and Hanson, C. (1965). Effect of oscillating electric fields on coalescence in liquid + liquid systems. Transactions of the. Faraday Society, 61, 1754.Google Scholar
Charles, G. E. and Mason, S. G. (1960). The coalescence of liquid drops with flat liquid/liquid interfaces. Journal of Colloid Science, 15(3), 236267.CrossRefGoogle Scholar
Chatterjee, J., Nikolov, A. D., and Wasan, D. T. (1996). Study of drop-interface coalescence using piezoimaging. Industrial and Engineering Chemistry Research, 35, 29332938.Google Scholar
Chen, C. T., Maa, J. R., Yang, Y. M., and Chang, C. H. (1998). Effects of electrolytes and polarity of organic liquids on the coalescence of droplets at aqueous-organic interfaces. Surface Science, 406(1–3), 167177.CrossRefGoogle Scholar
Coulaloglou, C. A. and Tavlarides, L. L. (1977). Description of interaction processes in agitated liquid–liquid dispersions. Chemical Engineering Science, 32, 12891297.Google Scholar
Cusack, R. (2009). Rethink your liquid–liquid separations. Hydrocarbon Processing, June, 53–60.Google Scholar
Derjaguin, B. and Kussakov, M. (1939). Anomalous properties of thin films. Acta Physicochim. U.R.S.S., 10, 25.Google Scholar
Dreher, T. M., Glass, J., O’Connor, A. J., and Stevens, G. W. (1999). Effect of rheology on coalescence rates and emulsion stability. AIChE Journal, 45(6), 11821190.Google Scholar
Eow, J. S. and Ghadiri, M. (2003). The behaviour of a liquid/liquid interface and drop-interface coalescence under the influence of an electric field. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 215, 101123.CrossRefGoogle Scholar
Eow, J. S., Ghadiri, M., Sharif, A., and Williams, T. J. (2001). Electrostatic enhancement of the coalescence of water droplets in oil: a review of the current understanding. Chemical Engineering Journal, 84(3), 173192.Google Scholar
Feng, L., Zhang, Z., Mai, Z., et al. (2004). A super-hydrophobic and super-oleophilic coating mesh film for the separation of oil and water. Angewandte Chemie International Edition, 43, 20122014.CrossRefGoogle ScholarPubMed
Gardner, E. A. and Apfel, R. E. (1993). Using acoustics to study and stimulate the coalescence of oil drops surrounded by water. Journal of Colloid Interface Science, 159, 226237.CrossRefGoogle Scholar
Gebauer, F., Villwock, J., Kraume, M. and Bart, H.-J. (2016). Detailed analysis of single drop coalescence: Influence of ions on film drainage and coalescence time. Chemical Engineering Research and Design, 115, 282291.Google Scholar
Hadjiev, D. and Aurelle, Y. (1995). Phase inversion: a method for separation of fine liquid–liquid dispersions. The Chemical Engineering Journal, 58, 4551.Google Scholar
Hadjiev, D. and Kuychoukov, G. A. (1989). Separator for liquid–liquid dispersions. The Chemical Engineering Journal, 41, 113116.Google Scholar
Hadjiev, D. and Paulo, J. B. A. (2005). Extraction separation in mixer–settlers based on phase inversion. Separation and Purification Technology, 43, 257262.Google Scholar
Hartland, S., Yang, B., and Jeelani, S. A. K. (1994). Dimple formation in the thin film beneath a drop or bubble approaching a plane surface. Chemical Engineering Science, 49(9), 13131322.Google Scholar
Henschke, M., Schlieper, L. H., and Pfennig, A. (2002). Determination of a coalescence parameter from batch-settling experiments. Chemical Engineering Journal, 85, 369378.CrossRefGoogle Scholar
Hofmeister, F. (1888). Archives of Experimental Pathology and Pharmacology, 24, 247260.CrossRefGoogle Scholar
Huang, X. and Lim, T.-T. (2006). Performance and mechanism of a hydrophobic–oleophilic kapok filter for oil/water separation. Desalination, 190, 295307.Google Scholar
Jeelani, S. A. K. and Hartland, S. (1993). Effect of velocity fields on binary and interfacial coalescence. Journal of Colloid and Interface Science, 156, 467477.Google Scholar
Jeelani, S. A. K. and Windhab, E. J. (2009). Drop coalescence in planar extensional flow and gravity. Chemical Engineering Science, 64, 27182722.Google Scholar
Kamp, J. and Kraume, M. (2016). From single drop coalescence to droplet swarms: Scale-up considering the influence of collision velocity and drop size on coalescence probability. Chemical Engineering Science, 156, 162177.Google Scholar
Kocherginsky, N. M., Tan, C. L., and Lu, W. F. (2003). Demulsification of water-in-oil emulsions via filtration through a hydrophilic polymer membrane. Journal of Membrane Science, 220, 117128.CrossRefGoogle Scholar
Kukizaki, M. and Goto, M. (2008). Demulsification of water-in-oil emulsions by permeation through Shirasu-porous-glass (SPG) membranes. Journal of Membrane Science, 322, 196203.Google Scholar
Lee, C. and Baik, S. (2010). Vertically-aligned carbon nano-tube membrane filters with superhydrophobicity and superoleophilicity. Carbon, 48, 21922197.Google Scholar
Liao, Y. and Lucas, D. (2010). A literature review on mechanisms and models for the coalescence process of fluid particles. Chemical Engineering Science, 65, 28512864.Google Scholar
Luo, X., He, L., Wang, H., Yan, H., and Qin, Y. (2016). An experimental study on the motion of water droplets in oil under ultrasonic irradiation. Ultrasonics Sonochemistry, 28, 110117.CrossRefGoogle Scholar
Luo, X., Cao, J., He, L., et al. (2017). An experimental study on the coalescence process of binary droplets in oil under ultrasonic standing waves. Ultrasonics Sonochemistry, 34, 839846.Google Scholar
MacKay, G. D. M. and Mason, S. G. (1963). Some effects of interfacial diffusion on the gravity coalescence of liquid drops. Journal of Colloid Science, 18(7), 674683.Google Scholar
Mandralis, Z. I. and Feke, D. L. (1992). Fractionation of suspensions using synchronized ultrasonic and flow fields. Amercial Institute of Chemical Engineers Journal, 39, 197206.Google Scholar
Mandralis, Z. I. and Feke, D. L. (1993). Continuous suspension fractionation using acoustic and divided-flow fields. Chemical Engineering Science, 48(23), 38973905.Google Scholar
Maphutha, S., Moothi, K., Meyyappan, M., and Iyuke, S. E. (2013). A carbon nanotube-infused polysulfone membrane with polyvinyl alcohol layer for treating oil-containing waste water. Scientific Reports, 3(1509), 16.Google Scholar
May, K., Jeelani, S. A. K., and Hartland, S. (1998). Influence of ionic surfactants on separation of liquid–liquid dispersions. Colloids and Surfaces A: Physicochemical and Engineering Aspects, 139, 4147.Google Scholar
Nakashima, T. and Kuroki, Y. (1981). Effect of composition and heat treatment on the phase separation of NaO–B2O3–SiO2–Al2O3–CaO glass prepared from volcanic ashes. Nippon Kagaku Kaishi, 8, 1231.CrossRefGoogle Scholar
Nakashima, T., Shimizu, M., and Kukizaki, M. (2000). Particle control of emulsion by membrane emulsification and its applications. Advanced Drug Delivery Reviews, 45, 4756.Google Scholar
Nii, S., Kikumoto, S., and Tokuyama, H. (2009). Quantitative approach to ultrasonic emulsion separation. Ultrasonics Sonochemistry, 16, 145149.Google Scholar
Prince, M. J. and Blanch, H. W. (1990) Bubble coalescence and break-up in air-sparged bubble columns. Amercial Institute of Chemical Engineers Journal, 36, 14851499.CrossRefGoogle Scholar
Qiu, J. (2010). Intensification of liquid–liquid contacting processes. Ph.D. thesis, The University of Kansas.Google Scholar
Rohrbach, K., Li, Y., Zhu, H., et al. (2014). A cellulose based hydrophilic, oleophobic hydrated filter for water/oil separation. Chemical Communications, 50, 1329613299.CrossRefGoogle ScholarPubMed
Sovova, H. (1981). Breakage and coalescence of drops in a batch stirred vessel – II comparison of model and experiments. Chemical Engineering Science, 36, 15671573.CrossRefGoogle Scholar
Stevens, G. W., Pratt, H. R. C., and Tai, D. R. (1990). Droplet coalescence in aqueous electrolyte solutions. Journal of Colloid and Interface Science, 136(2), 470479.CrossRefGoogle Scholar
Tolt, T. L. and Feke, D. L. (1988). Analysis and application of acoustics to suspension processing, in ASME 23rd Intersociety Energy Conversion Engineering Conference, 4, 327.Google Scholar
Urdahl, O., Berry, P., Wayth, N., et al. (1998). The development of a new compact electrostatic coalescer concept. SPE 48990, SPE Annual Technical Conference and Exhibition held in New Orleans, Louisiana, 27-30 September 1995.Google Scholar
Venkateswara Rao, A. V., Hegde, N. D., and Hirashima, H. (2007). Absorption and desorption of organic liquids in elastic superhydrophobic silica aerogels. Journal of Colloid and Interface Science. 305, 124132.CrossRefGoogle ScholarPubMed
Wallau, W., Schlawitschek, C., and Arellano-Garcia, H. (2016). Electric field driven separation of oil−water mixtures: model development and experimental verification. Industrial and Engineering Chemistry Research, 55, 45854598.Google Scholar
Weheliye, W. H., Dong, T., and Angeli, P. (2017). On the effect of surfactants on drop coalescence at liquid/liquid interfaces. Chemical Engineering Science, 161, 215227.Google Scholar
Whitworth, G., Grundy, M., and Coakley, W. (1991). Transport and harvesting of suspended particles using modulated ultrasound. Ultrasonics, 29(6), 439444.Google Scholar
Williams, T. J. and Bailey, A. G. (1986). Changes in the size distribution of a water-in-oil emulsion due to electric field induced coalescence. IEEE Transactions On Industry Applications, Ia-22(3), May/June, 536541.Google Scholar
Xue, Z., Wang, S., Lin, L., et al. (2011). A novel superhydrophilic and underwater superoleophobic hydrogel-coated mesh for oil/water separation. Advanced Materials, 23, 42704273.Google Scholar
Zhang, X., Basaran, O. A., and Wham, R. M. (1995). Theoretical prediction of electric field-enhanced coalescence of spherical drops. AIChE Journal, 41(7), 16291639.Google Scholar

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