Silicone-polyether Copolymers as New Steam Turbine Oil Demulsifiers

Document Type: Research Paper


1 P.O. Box7220, Beijing 100072

2 P.O. Box 7220, Beijing 100072, P.R. China

3 NO.19.73A, the Western 3rd Ring-Road, Beijing 100036, P.R. China


Turbine oil plays an important role in supporting optimal steam turbine performance. Some additives in turbine oil can cause emulsification when the oil is contaminated by water, so demulsibility is a very important property of the steam turbine oil. In order to improve the demulsibility of steam turbine oil, two kinds of polyether-silicone comb copolymers are synthesized and used as steam turbine oil demulsifiers. The polyether-silicone copolymers present better demulsibility properties than the demulsifiers on the market at the present time. The influences of demulsifiers on turbine oil-water interfacial tension and demulsibility time were measured. All the demulsifiers obviously decrease interfacial tension andsimultaneously reduced the demulsibility time. The variation tendency of interfacial tension and demulsibility time is basically consistent. The oil-water interfacial elastic modulus and viscous modulus were also measured as a function of strain and frequency respectively. The results showed that the demulsifiers decrease the oil-water interfacial elastic modulus, which was favorable to the demulsification.


      [1]     Ahn H.S., Yoon E.S., Sohn D.G., Kwon O.K., et al., “Practical ContaminantAnalysis of Lubricating Oil In A Steam Turbine-Generator,” Tribology International,1996, 29, 161-168.

      [2]     Yu. A. Radin., “The Influence of the Type of Steam Distribution in Steam Turbines of Combined-Cycle Plants on the Effectiveness of Their Operation,” Thermal Engineering, 2012, 59, 707-711.

      [3]     Caiping W., Shaoping L., and Liqun Z., “A Study on the Water-separation Property of Marine Lubricating Oil with a Rust Inhibitor,” Petroleum Science and Technology, 2013, 31, 2149-2156.

      [4]     Coleman W. L., “Steam Turbines-Water in the Lube Oil,” Presented at the Rotating Machinery Repair User's Council Meeting, Long Beach, California, 1987.

      [5]     Prabhakaran A. and Jagga C. R., “Condition Monitoring of Steam Turbine-Generator through Contamination Analysis of UsedLubricating Oil,” Tribology International, 1999, 32, 145–152.

      [6]     Chesnokov A. A., Antipina N. A., and Fomina O. N., “Demulsifying Properties of Hydraulic Oils,” Chemistry and Technology of Fuels and Oils, 1987, 23, 231-234.

      [7]     Owen M. J., “The Surface Activity of Silicones: A Short Review,” Industrial & Engineering Chemistry Product Research & Development, 1980, 19, 97-103.

      [8]     Schramm L. L., “Petroleum Emulsions-Basic Principles in Emulsions: Fundamentals and Applications in the Petroleum Industry,” American Chemical Society, Washington, DC, 1992, 1-49.

      [9]     Kloet J. V., Schramm L. L., and Shelfantook B., “Application of the Hydrophile-lipophile Balance Concept to the Classification ofDemulsifiers and Bituminous Froth and its Components,” Fuel Processing Technology,2002, 75, 9-26.

    [10]    Sakakia Sh., Mizoea N., Sugimotoa M., and Musashib Y., “Pt-catalyzed Hydrosilylation of Ethylene. A Theoretical Study of the Reaction Mechanism,” Coordination Chemistry Reviews, 1999, 190, 933-960.

    [11]    Mukbaniani O., Tatrishvili T., Titvinidze G., Mukbaniani N., et al., “Hydrosilylation Reaction of Methylhydridesiloxane to Phenyl-acetylene,” Journal of Applied Polymer Science, 2006, 100, 2511-2515.

    [12]    Karstedt B. D., “Platinum Complexes of Unsaturated Siloxanes and Platinum Containing Organopolysiloxane,” US Patent No. 3775452[P], 1973.

         [13]         Opawale F. O. and Burgess D. J., “Influence of Interfacial Properties of Lipophilic Surfactants on Water-in-oil Emulsion Stability,” Journal of Colloid and interface Science, 1998,197, 142-150.

    [14]    Qiao J. J. and Zhan M., “Study on the Mechanism of Petroleum Emulsion’s Breaking Effect of Interfacial Tension on the Effectiveness of Demulsification,” Acta. Petrolei. Sinica. (Petroleum Processing section), 1999, 15, 1-2.

    [15]    Tsvetkov O. N., Kolesova G. E., Bogdanov Sh. K., and Toporishcheva R. I, “Toporishcheva. Rheological Properties and Lubricity of Poly-alpha Olefin Oils,” Chemistry and Technology of Fuels and Oils, 1987, 23, 228-231.

    [16]    Daniel-David D., Pezron I., and Dalmazzone Ch., “Elastic Properties of Crude Oil/Water Interface in Presence of Polymeric Emulsion Breakers,” Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2005, 270, 257-262.