Abstract
A study of the link between the infra-red (IR) absorbance and the relative static permittivity Ɛ r of liquid hydrocarbons is of special interest for developing in-situ oxidation monitoring tools. In particular, where IR measurements are difficult to implement but cost efficient and durable capacitive probes can be used. This paper will explore this link by exposing a paraffinic hydrocarbon to oxidation in an accelerated degradation process, while measuring the IR absorption and Ɛ r values during this process. It is shown to what extent the IR response of the hydrocarbon liquid changes in the 500 to 4000 cm -1 window, and how this can be translated into a measured increase in Ɛ r during oxidation time. The correlation coefficient between IR absorbance at around 1720 cm -1 and Ɛ r increase with oxidation time was 99.7%. This remarkably good agreement shows that capacitive probes have the potential to be used as a substitutional in-field tool for in-situ degradation monitoring of hydrocarbon liquids.
Published Version
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