Continuous Separation Process of Water-in-Crude Oil Emulsion by Simultaneous Application of an Electrical Field Combined with a Novel Absorbent Based on Functionalised PolyHIPE Polymer

Abbas K.  Algburi

doi:10.52716/jprs.v11i4.565

Authors

Abbas K. Algburi Midland Refineries Company, Ministry of Oil, Iraq

DOI:

https://doi.org/10.52716/jprs.v11i4.565

Keywords:

Demulsification; Emulsion flow rate; Separation efficiency; Electrostatic Separator; Electric field strength.

Abstract

During the extraction process of crude oil, the removal of water from a high stability water-in-crude oil emulsions is life-threatening for the production of a profitable product. However, several technologies of separation exist today, e.g. stripping columns, centrifugal separators, coalescence separators, vacuum distillation systems and gravity separators, almost all of these approaches are not able to completely remove water from water-in-crude oil emulsions besides their high cost.

In this study, the preparation of a high internal phase emulsion (HIPE) was achieved on a laboratory scale. Subsequently, it was polymerized and sulphonated to produce a hydrophilic macroporous polyHIPE polymer (PHP) called silane (vinyl trimethoxy silane) PHP with a relatively high surface area of 104 m 2/g. It demonstrates high water absorption capability in addition to its ability to remove surface active substances such as Mg, Ca, Na and Cl, from crude oil which cause crude oil emulsification.

The rates of demulsification of water-in-crude oil emulsions were examined in high AC field under various emulsion inlet flow rates from 100 ml/min to 1500 ml/min and different applied voltages from 1-5 kV (equivalent to 14-69 kV/m) by using a model of an electrostatic separator combined with silane PHP as absorber. It was found that the best separation efficiency was 91% with applied voltage of 5 kV and emulsion inlet flow rate of 100 ml/min. When the spent silane PHP was reused in the demulsification process under similar conditions, a separation efficiency of up to 73% was achieved. Also, it was noticed that the separation efficiency was increased with the increase in applied voltage and reduction in the inlet flow rate of emulsion. Moreover, the original or spent silane PHP were able to remove the undesired metals present in the crude oil.

Keywords: Demulsification; Emulsion flow rate; Separation efficiency; Electrostatic Separator; Electric field strength.

References

Roodbari, N.H., Badiei, A., Soleimani, E. and Khaniani, Y., ‘Tweens demulsification effects on heavy crude oil/water emulsion’, Arabian Journal of Chemistry, 9, 2016, pp. 806-811.

Roshan, N., Ghader, S., Rahimpour, M.R., ‘Application of the response surface methodology for modeling demulsification of crude oil emulsion using a demulsifier’, Journal of Dispersion Science and Technology, 39(5), 2018, pp. 700-710.

Othman, N., Ahmad, A., Piramali, M.A., Jaafar, N., Zailani, S.N., ‘Effect of electrical field on demulsification of water in oil emulsion in emulsion liquid membrane process’, Journal of Materials Science and Engineering, 4(10), 2010, pp. 51-55.

Wang, S.S., Lee, C.J., Chan, C.C., ‘Demulsification of water-in-oil emulsions by use of a high voltage AC field’, Sep. Sci. Technol., 29(2), 1994, pp. 159-170.

Draxler, J., Marr, R., ‘Design criteria for electrostatic demulsifiers’, Int. Chem. Eng., 33(1), 1993, pp. 1-7.

Tarantsev, K.V., Tarantseva, K.R., ‘Influence of electric field strength on the processes of destruction and creation of water-oil emulsions during crude oil desalting’, Chemical and Petroleum Engineering, 53(11), 2018, pp. 703-706.

Kang, W., Li, M., Yang, H., Kang, X., Wang, F., Jiang, H., Zhang, M., Zhu, T., Sarsenbekuly, B., ‘Coalescence behavior of aqueous drops in water-in-oil emulsions under high-frequency pulsed AC fields’, Journal of Industrial and Engineering Chemistry, 93, 2021, pp. 415-422.

Hano, T., Ohtake, T, Takage, K., ‘Demulsification kinetics of w/o emulsion in an A.C. Electric field’, J. Chem. Eng. Jpn, 21(4), 1998, pp. 345-351.

Sun, Y., Yang, D., Sun, H., Wu, H., Chang, Q., Shi, L., Cao, Y., He, Y., Xie, T., ‘Experimental study on the falling and coalescence characteristics of droplets under alternating electric fields’, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 603, 2020, pp. 125-136.

Tarantsev, K.V., Tarantseva, K.R., ‘Effect of electric field nonuniformity on the processes of creation and destruction of water-oil emulsions during crude oil desalting’, Chemical and Petroleum Engineering, 53(11), 2018, pp. 707-710.

Wang, S.S., Lee, C.J., Chan, C.C., ‘Demulsification of water-in-oil emulsions by use of a high voltage AC field’, Sep. Sci. Technol., 29(2), 1994, pp. 159-170.

Cameron, N.R., ‘High internal phase emulsion templating as a route to well-defined porous polymers’, Polymer. 46(5), 2005, pp. 1439-1449.

Silverstein, M.S., ‘Emulsion-templated polymers: Contemporary contemplations’, Polymer, 126, 2017, pp. 261-82.

Akay, G., Bokhari, M., Byron, V. and Dogru, M., ‘Development of nano-structured micro-porous materials and their application in bioprocess–chemical process intensification and tissue engineering’, Chemical engineering: Trends and developments. John Wiley & Sons, New York, 2005, pp. 171-197.

Thumbarathy, D., ‘Preparation of functional polyHIPE polymers for agro-process and bio-process applications’, Doctoral dissertation, Newcastle; e University, 2018, pp. 47-49.

Lee, C.-M., Sams, G.W. and Wagner, J., ‘Power consumption measurements for ac and pulsed dc for electrostatic coalescence of water-in-oil emulsions. Journal of electrostatics’, 53(1), 2001, pp. 1-24.

Eow, J.S. and Ghadiri, M., ‘Electrostatic enhancement of coalescence of water droplets in oil: a review of the technology’, Chemical Engineering Journal, 85(2-3), 2002, pp. 357-368.

Hosseinpour, F., Ghader, S., Rahimpour, M.R., Bagheri H., ‘Modification of an industrial crude oil desalting unit by electric mixing to improve the dehydration efficiency’, Journal of Chemical Technology & Metallurgy, 54(1), 2019, pp. 124-131.

Tarantsev, K.V., Proshin, I.A., ‘Methodology of study of the behavior of heterogeneous systems in water-oil emulsion electrodispersion and electrodemulsification processes’, Chemical and Petroleum Engineering, 52(9-10), 2017, pp. 682-686.

Pekdemir, T., Akay, G., Dogru, M., Merrells, R.E. and Schleicher, B., ‘Demulsification of highly stable water-in-oil emulsions’, Separation science and technology, 38(5), 2003, pp. 1161-1183.

Akay, G., and Vickers, J., ‘Method for separating oil in water emulsions’, European Patent, 1.

Akay, G., Birch, M.A. and Bokhari, M.A., ‘Microcellular polyHIPE polymer supports osteoblast growth and bone formation in vitro’, Biomaterials, 25(18), 2004, pp. 3991-4000.

Kim, B.-Y., Moon, J.H., Sung, T.-H., Yang, S.-M. and Kim, J.-D., ‘Demulsification of water-in-crude oil emulsions by a continuous electrostatic dehydrator’, Separation science and technology. 37(6), 2002, pp. 1307-1320.

Mohammadian, E., Taju Ariffin, T.S., Azdarpour, A., Hamidi, H., Yusof, S., Sabet, M., Yahya, E., ‘Demulsification of light malaysian crude oil emulsions using an electric field method’, Industrial & Engineering Chemistry Research, 57(39), 2018, pp. 13247-13256.

Song, M.G., Jho, S.H., Kim, J.Y., Kim., ‘Rapid evaluation of water-in-oil (w/o) emulsion stability by turbidity ratio measurements’, J. Colloid Interface Sci., 230, 2000, pp. 213-215.