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Sensors 2015, 15(10), 26457-26477; doi:10.3390/s151026457

Sensor and Methodology for Dielectric Analysis of Vegetal Oils Submitted to Thermal Stress

Federal University of Technology - Paraná (UTFPR) - Electrical Engineering Graduate Program - PPGEE-UTFPR-PG; Av. Monteiro Lobato, km 04 - s/n°, Ponta Grossa 84016-210, Brazil
Federal University of Technology- Paraná (UTFPR) - Chemical Engineering Academic Department - DAENQ-UTFPR-PG; Av. Monteiro Lobato, km 04 - s/n°, Ponta Grossa 84016-210, Brazil
Author to whom correspondence should be addressed.
Academic Editor: W. Rudolf Seitz
Received: 16 May 2015 / Accepted: 13 October 2015 / Published: 16 October 2015
(This article belongs to the Section Chemical Sensors)
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Vegetable oils used in frying food represent a social problem as its destination. The residual oil can be recycled and returned to the production line, as biodiesel, as soap, or as putty. The state of the residual oil is determined according to their physicochemical characteristics whose values define its economically viable destination. However, the physicochemical analysis requires high costs, time and general cost of transporting. This study presents the use of a capacitive sensor and a quick and inexpensive method to correlate the physicochemical variables to the dielectric constant of the material undergoing oil samples to thermal cycling. The proposed method allows reducing costs in the characterization of residual oil and the reduction in analysis time. In addition, the method allows an assessment of the quality of the vegetable oil during use. The experimental results show the increasing of the dielectric constant with the temperature, which facilitates measurement and classification of the dielectric constant at considerably higher temperatures. The results also confirm a definitive degradation in used oil and a correlation between the dielectric constant of the sample with the results of the physicochemical analysis (iodine value, acid value, viscosity and refractive index). View Full-Text
Keywords: dielectric constant; capacitive sensor; oil vegetal; recycle dielectric constant; capacitive sensor; oil vegetal; recycle

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Stevan, S.L., Jr.; Paiter, L.; Galvão, J.R.; Roque, D.V.; Chaves, E.S. Sensor and Methodology for Dielectric Analysis of Vegetal Oils Submitted to Thermal Stress. Sensors 2015, 15, 26457-26477.

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