A vegetable lubricant developed for two stroke engines: compressibility and CO2 solubilities


T. Regueira1, L. Lugo2, E. Lopez1 and J. Fernandez1

1University of Santiago de Compostela, Spain
2University of Vigo, Spain

Keywords: pressure
property: solubility, density
material: vegetable oils, carbon dioxide

Nowadays, due to increasing concerns over the use of petroleum-based products, new technologies aim at the development of products from renewable sources. In this regard, vegetable oils constitute a suitable alternative for replacing mineral oils [1]. Two-stroke engine oils are one of the areas where most of the lubricants and their degradation products are released directly into the environment, polluting the soil, water and atmosphere [2].

The solubility of different gases, such us carbon dioxide, in lubricants used for two stroke engines is an important parameter. Likewise, the knowledge of the density as a function of temperature and pressure is important because it is an appropriate procedure to determine the isothermal compressibility, a key property for other applications as hydraulic fluids. Moreover, the density is a parameter necessary for the experimental solubility determination. In this work we have performed density measurements of a biodegradable lubricant based in high oleic sunflower oil, developed for two stroke engines, in broad temperature and pressure ranges, i.e. from 278.15 to 298.15 K and up to 120 MPa. Measurements were carried out in a fully automated densimeter Anton Paar HPM [3]. We have correlated density values by means of the modified Tammann-Tait equation obtaining an absolute average deviation of 0.02%. Furthermore we have measured CO2 solubility in this biodegradable lubricant by means of an isochoric technique [4]. These measurements were performed from 283.15 to 348.15 K and up to 8 MPa. Compressibilities and CO2 solubilities are compared with those of the reference oil and other vegetable oils.

This work is supported by Spanish Ministry of Science and Innovation under PSE-420000-2008-4 project and EU FEDER program. We are grateful to the project partners for providing the oil sample. L. L. acknowledges the financial support from the Ramon y Cajal Program. T.R. acknowledges financial support provided by the FPU program.

References
  1. A. Campanella, E. Rustoy, A. Baldessari, M. A. Baltanás, Bioresour. Technol.101, 245 (2010)

  2. O. N. Anand, V. K. Chhibber, J. Synth. Lub. 23, 91 (2006)

  3. J. J. Segovia, O. Fandiño, E. R. López, L. Lugo, C. Martín, J. Fernández, J. Chem. Thermodyn. 41, 632 (2009)

  4. O. Fandiño, E. R. Lopez, L. Lugo, M. Teodorescu, A. M. Mainar, J. Fernández, J. Chem. Eng. Data 53, 1854 (2008)

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