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Abstract

During operations using biodegradable oil for lubrication, the chemical structure of the biolubricant changes and, as a consequence, its biodegradability tends to decrease. Despite the fact that the biodegradability of most of the fresh biodegradable oils has been well determined, the monitoring of the biodegradability of oil during its aging has not been studied. Thus, the development of a monitoring method for on-line measuring of lubricant biodegradability could provide a significant advance in lubrication and environmental management. In the present paper, the prediction of the biodegradability of a lubricant by means of near infrared (NIR) spectroscopy combined with advanced statistical techniques like PLS is presented. Three fully formulated ester oils and a biodegradable base oil without additives were selected for performing laboratory oxidation in a batch reactor at 140°C using an air flux and aided by mechanical stirring. During the aging process of the oils, 35 aliquots were sampled at different degradation times, in order to build a mathematical model which allowed the biodegradability of oil to be predicted.

Keywords

biodegradability lubricant ecolabel ester OECD method renewable biodegradable

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New Method Proposed for the Assessment of Lubricant Biodegradability during its Use

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