Demulsification of Water-in-Oil Emulsions by Microwave Heating Technology

Authors: Abdurahman H. Nour, Rosli M. Yunus, Azhary. H. Nour

Abstract:

The mechanism of microwave heating is essentially that of dielectric heating. After exposing the emulsion to the microwave Electromagnetic (EM) field, molecular rotation and ionic conduction due to the penetration of (EM) into the emulsion are responsible for the internal heating. To determine the capability of microwave technology in demulsification of crude oil emulsions, microwave demulsification method was applied in a 50-50 % and 20- 80 % water-in-oil emulsions with microwave exposure time varied from 20-180 sec. Transient temperature profiles of water-in-oil emulsions inside a cylindrical container were measured. The temperature rise at a given location was almost horizontal (linear). The average rates of temperature increase of 50-50 % and 20-80 % water-in-oil emulsions are 0.351 and 0.437 oC/sec, respectively. The rate of temperature increase of emulsions decreased at higher temperature due to decreasing dielectric loss of water. These results indicate that microwave demulsification of water-in-oil emulsions does not require chemical additions. Microwave has the potential to be used as an alternative way in the demulsification process.

Keywords: Demulsification, temperature profile, emulsion.Microwave heating, dielectric, volume rate.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1331157

References:

[1] Ali, M.F. and M.H. Alqam, 2000. The role of asphaltenes, resins and other solids in the stabilization of Water-in-Oil Emulsions and its effects on oil production in Saudi oil fields. Fuel,79:1309- 1316.DOI:10.1016/S0016 2361(99)00268-9
[2] Ayappa, K.G.; Chatterjee,A and Basak, T. (1998). Analysis of Microwave Sintering of Ceramics. AIChEJ.
[3] Ayappa, K.G.; Davis, H.T.; Davis, E.A.; and Gordon, J. (1992). Two Dimensional Finite Element Analysis of Microwave Heating. AIChEJ.
[4] Kim, Y.H. et al., 1996. Demulsification of water-in-crude oil emulsions. Effects of film tension, elasticity, diffusivity and interfacial activity of demulsifier individual components and their blends. Dispers. Sci. Technol., 17: 33-53.
[5] Klaila, W.J. 1983. Method and apparatus for controlling fluency of high viscosity hydrocarbon fluids. U.S. Patent 4,067.683.
[6] Fang, C.S., B.K.L. Chang, P.M.C. Lai and W.J. Klaila, 1988. Microwave demulsification. Chem. Eng. Commun.,73:227-239.
[7] Fang, C.S. and P.M.C. Lai, 1995. Microwave heating and separation of water-in-oil emulsions. J. Microwave Power Electromagnet. Energ., 30: 46-57.
[8] Fang, C.S.; Lai, P.M.C.; Chang, B.K.L.; Klaila, W.J. 1989. Oil recovery and waste reduction by microwave radiation. Environ.Prog. 235-238.
[9] Chan, C.C. and C.C. Yeong, 2002. Demulsification of water-in-oil emulsions by microwave radiation. Sep.Sci.Technol.,37:3407-3420.
[10] Marand, E.; Baker, HR.; and Graybeal, JD. (1992). Comparison of reaction mechanisms of epoxy resins undergoing thermal and microwave cure from insitu measurements of microwave dielectric properties and infrared spectroscopy. Macromolecules. 25 :2242-2252.
[11] Janney, MA.; and Kimery, HD. (1991). Diffusion-controlled processes in microwave fired oxide ceramics. In : Snyder Jr. WB, Sutton WH, Iskander MF, Johnson DL Editors. Microwave processing of materials II, Materials research society proceedings, 189. pp.215-227
[12] Tanmay, B. and K.G. Ayappa, 1997. Analysis of microwave thawing of slabs with effective heat capacity method. J. Am. Inst. Chem. Eng., 43: 1662-1674.
[13] Thostenson, E.T.; and Chou, T.W. (1999). M icrowave processing: Fundamentals and Applications. Composite, part A.30, 1055-1071.
[14] Wolf, N.O., 1986. Use of microwave radiation in separating emulsions and dispersions of hydrocarbons and water. US Patent, 4582629.
[15] Hippel, A.R. 1954. Dielectric Materials and Applications. MIT Press. Cambridge. MA.