Wax Aggregation Inhibition in Crude Oil by Oxirane Ester Copolymer
Published at : 30 Jan 2016
Volume : IJtech
Vol 7, No 1 (2016)
DOI : https://doi.org/10.14716/ijtech.v7i1.2114
Yulizar, Y., Utari, T., Ananda, D.P., 2016. Wax Aggregation Inhibition in Crude Oil by Oxirane Ester Copolymer. International Journal of Technology. Volume 7(1), pp. 158-167
| Yoki Yulizar | Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia |
| Tresye Utari | Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia |
| Destia Puteri Ananda | Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia |
Wax deposition can cause a serious problem in the distribution process of crude oil through a pipeline. At low temperatures, wax molecules can interact to form a wax aggregate. One way to reduce the wax aggregation is to introduce an additive compound into the crude oil. In this study, 15 crude oil models were prepared by mixing gasoline, kerosene, oil, wax, and asphaltene. Oxirane ester copolymer (OEC) additive was introduced into the crude oil models with various concentrations and volumes, and its effect on the crude oil models’ pour point and viscosity were evaluated. OEC interactions with wax and asphaltene were observed by FTIR, and the wax aggregation process was observed using cross polarized microscopy (CPM). The optimum pour point of crude oil was reached at a temperature of 6oC and optimum viscosity at 10 cSt for the selected model 4. OEC additions of 5% and 10% require 500 and 300 µL, respectively, to achieve the optima pour point and viscosity. OEC was able to inhibit the wax aggregation, as evidenced from the interaction between OEC-wax at 722 cm-1 and OEC-asphaltene at 1604 and 1494 cm-1 of FTIR spectra. The distribution of the wax aggregate was observed using CPM, with the value of the wax appearance temperature (WAT) at 28.7oC. This research can be the basis for designing or selecting a molecule for use as a pour point depressant in accordance with the characteristics of crude oil, particularly since each source of crude oil has different characteristics.
Crude oil, Inhibition process, Oxirane ester copolymer, Pour point, Wax
Ahn, S., Wang, K.S., Shuler, P.J., Creek, J.L., Tang, Y., 2005. Paraffin Crystal and Deposition Control by Emulsification. In: SPE International Symposium on Oilfield Chemistry 2005, Society of Petroleum Engineers Inc.,The Woodlands, Texas
Burger, E.D., Perkins, T.K., Striegler, J.H., 1981. Studies of Wax Deposition in the Trans Alaska Pipeline. J Pet Technol., Volume 33(6), pp. 1075–1086
Chanda, D., Sarmah, A., Borthakur, A., Rao, K.V., Subrahmanyam, B., Das H.C., 1998. Combined Effect of Asphaltenes and Flow Improvers on the Rheological Behaviour of Indian Waxy Crude Oil. Fuel, Volume 77, pp. 1163–1167
Elsharkawy, A.M., Al-Sahhaf, T.A., Fahim, M.A., 2000. Wax Deposition from Middle East Crudes. Fuel, Volume 79(9), pp. 1047–1055
Hemant, P.S., Kiranbala, Bharambe, D.P., 2008. Performance based Designing of Wax Cystal Growth Inhibitors. Energy & Fuels, Volume 22(6), pp. 3930–3938
Jiang, C., Xu, M., Xi, X., Qi, P., Shang, H., 2006. Poly-acrylic Acid Derivatives as Diesel Flow Improver for Paraffin-based Daqing Diesel. Journal of Natural Gas Chemistry, Volume 15(3), pp. 217–222
Machado, C.L.A., Lucas, F.E., 2001. The Influence of Vinyl Acetate Content of the Poly(ethylene-co-vinyl acetate) (EVA) Additive on the Viscosity and the Pour Point of a Brazilian Crude Oil. Pet Sci Technol, Volume 19, pp. 197–204
Newberry, E.M., 1984. Chemical Effects on Crude Oil Pipeline Pressure Problems. J Petrol Technol, Volume 36, pp. 779–86
Odebunmi, E.O., Ogunsakin, E.A., Ilukhor, P.E.P., 2002. Characterization of Crude Oils and Petroleum Products: (i) Elution Liquid Chromatographic Separation and Gas Chromatographic Analysis of Crude Oils and Petroleum Products. Bulletin of the Chemical Society of Ethiopia, Volume 16(2), pp. 115–132
Ronningsen, H.P., Bjorndal, B., Hansen, A.B., Pedersen, W.B., 1991. Wax Precipitation from North Sea Crude Oils. 1. Crystallization and Dissolution Temperatures and Newtonian and Non-newtonian Flow Properties. Energy
Fuels, Volume 5, pp. 895–908
Siringi, D.O., Home, P.G., Koehn, E., 2014. Cleaning Methods for Pipelines Renewals. International Journal of Engineering and Technical Research (IJETR), Volume 2(9), pp. 44–47
Soldi, R.A, Oliveira, A.R.S., Barbosa, R.V., César-Oliveira, M.A.F., 2007. Polymethacrylates: Pour Point Depressants in Diesel Oil. European Polymer Journal, Volume 43(8), pp. 3671–3678
Suryanaraya, I., Rao, K.V., Duttachaudhury, S.R., Subrahmanyam, S., Saikia, B.K., 1990. Infrared Spectroscopic Studies on the Interaction of Pour Point Depressant with Asphaltene, Resin, and Wax Fractions of Bombay High Crude. Fuel, Volume 69, pp. 1546–1551
Wang, S.L., Flamberg, A., Kikabhai, T., 1999. Select the Optimum Pour Point Depressant. Hydrocarbon Processing, Volume 78(2), pp. 59–63
Wuhua, C., Zongchang, Z., Caoyong, Y., 2010. The Interaction of Waxes with Pour Point Depressants. Fuel, Volume 89(5), pp. 1127–1132