In Pursuit of a High-Temperature, High-Pressure, High-Viscosity Standard: The Case of Tris(2-ethylhexyl) Trimellitate

This paper presents a reference correlation for the-viscosity of tris(2-ethylhexyl) trimellitate designed to serve in industrial applications for the calibration of viscometers at elevated temperatures and pressures such as those encountered in the exploration of oil reservoirs and in lubrication. Tris(2-ethylhexyl) trimellitate has been examined with respect to the criteria necessary for an industrial standard reference material such as toxicity, thermal stability, and variability among manufactured lots. The viscosity correlation has been based upon all of the data collected in a multinational project and is supported by careful measurements and analysis of all the supporting thermophysical property data that are needed to apply the standard for calibration to a wide variety of viscometers. The standard reference viscosity data cover temperatures from 303 to 473 K, pressures from 0.1 to 200 MPa, and viscosities from approximately 1.6 to 755 mPa s. The uncertainty in the data provided is of the order of 3.2% at 95% confidence level, which is thought to be adequate for most industrial applications. This work has been conducted under the guidance of the International Association for Transport Properties (IATP; http://transp.cheng.auth.gr/index.php/iatp/terms). The work described in this paper was carried out under the auspices of the International Union of Pure and Applied Chemistry (IUPAC) within the framework of the Project 2012-051-1-100. This work was supported by the strategic project PEst-OE/QUI/UI0100/ 2013 funded by Fundação para a Ciência e a Tecnologia (FCT), ̂Portugal. The authors are grateful to Ana Dias research technician fellowship at the Node IST at CQE of the Portuguese Mass Spectrometry Network, project REM2013 funded by Fundação para a Ciência e a Tecnologia (FCT), Portugal. ̂M.J.P.C. and J.F. acknowledge the support of the Spanish Ministry of Economy and Competitiveness and the FEDER program through the ENE2014-55489-C2-1-R project as well as of Xunta de Galicia through the EM2013/031 and GRC ED431C 2016/001 Projects. J.F. and M.J.P.C. acknowledge the assistance of J. M. Liñeira del Rio and M. J. G. Guimarey for the viscosity measurements. info:eu-repo/semantics/publishedVersion