Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2015.862.873EfeovbokhanV.E. OlayemiK.M. AnaweP.A.L. AbatanO.G. 62015156The de-emulsification of a Nigerian crude oil emulsion has been investigated using locally formulated base and acid catalyzed phenol formaldehyde resins with varied formaldehyde to phenol molar ratios. The bottle test method was used for the screening process and the best de-emulsifier was chosen based on the largest volume of water removed from the crude oil emulsion. The screening process was done at temperatures of 50 and 70°C and de-emulsifier concentrations of 20 and 50 part per million (ppm), respectively. A factorial design was done to determine the best combination of de-emulsification conditions for optimal performance. The results were optimized and analyzed using software called Minitab 16 utilizing pareto chart, normal effects, main effects and interactions plots. From the analysis, it was found that the optimum set of conditions for best performance of the resole de-emulsifier were 50 ppm, 70°C and 1.8:1 concentration, screening temperature and formaldehyde to phenol molar ratio, respectively. While for novolak de-emulsifiers, they were 50 ppm, 70°C and 0.1:1. Increasing temperature and concentrations were found to enhance de-emulsification performance with all the resole and novolak de-emulsifiers.]]>Aske, N.,2002Aveyard, R., B.P. Binks, P.D.I. Fletcher, X. Ye and J.R. Lu,1992Becher, P.,1985Bhardwaj, A. and S. Hartland,1998Easton, T. and B. Thomas,1989Energy Information Administration,2007Gafonova, O.V.,2000Hyne, N.J.,2001Ivanov, I.B. and P.A. Kralchevsky,1997Kokal, S., A. Al-Yousif and N.S. Meeranpillai,2001Kokal, S. and M. Wingrove,2000Kokal, S. and J. Al-Juraid,1999Krawczyk, M.A.,1990Myers, D.,1992Porter, M.R.,1994Rhee, C.H., P.C. Martyn and J.G. Kremer,1989Saywer, C.N., P.L. Mccarty and G.F. Parkin,1994Selvarajan, R., S. Ananthasubramaniam and A.M. Robert,2001Sjoblom, J., L. Mingyuan, A.A. Christy and T. Gu,1992Al-Sahhaf, T.A., M.A. Fahim and A.M. Elsharkawy,2009Al-Sabagh, A.M., M.R. Noor El-Din, S. Abo-El Fotouh and N.M. Nasser,2009Pena, A.A., G.J. Hirasaki and C.A. Miller,2005Temple-Heald, C., C. Davies, N. Wilson and N. Readman,2015