What is it about?
During this project we have defined two International Standards for viscosity at temperatures up to 473 K and pressures below 200 MPa: squalane and tris(2-ethylhexyl) trimellitate (TOTM), which have viscosities of 5 mPa s and 10 mPa s, respectively, at 473.15 K and 200 MPa and satisfy all the other criteria to be standards. In addition, we have performed a round robin experimental study and correlations of several thermophysical properties of Krytox GPL 102 over broad ranges of temperatures and pressures. Furthermore, for more viscous liquids, such as heavier oils and lubricants, experimental and theoretical studies were performed for dipentaerythritol hexa(3,5,5-trimethylhexanoate), for which the viscosity at 473.15 K and 200 MPa is around 80 mPa s.
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Why is it important?
The interest in a standard reference fluid for viscosity at high temperatures and high pressure was due to the trend within the oil industry toward the exploitation of deeper hydrocarbon reserves, both on- or off-shore, characterized by temperatures up to 473 K and pressures up to 200 MPa. This Standards are also needed in the lubrication sector
Perspectives
We have defined two International Standards for viscosity at temperatures up to 473 K and pressures below 200 MPa: squalane and tris(2-ethylhexyl) trimellitate (TOTM). We hope that these two standards will be used in for the validation or the calibration of the viscometers used for crude oil extraction in wells of greater depth either on- or offshore as well as for those used to measure viscosity of lubricants.
JOSEFA FERNANDEZ
Universidade de Santiago de Compostela
Read the Original
This page is a summary of: International Standard for viscosity at temperatures up to 473 K and pressures below 200 MPa (IUPAC Technical Report), Pure and Applied Chemistry, January 2019, De Gruyter,
DOI: 10.1515/pac-2018-0202.
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