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Master's Dissertation
DOI
https://doi.org/10.11606/D.88.2007.tde-13062008-154649
Document
Author
Full name
Ester Carvalho de Souza
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2007
Supervisor
Committee
Canale, Lauralice de Campos Franceschini (President)
Agustinho, Sylvana Cardoso Miguel
Casteletti, Luiz Carlos
Title in Portuguese
Estudo da oxidação do óleo de soja com diferentes concentrações de aditivos anti-oxidantes, para uso em tratamentos térmicos de têmpera
Keywords in Portuguese
Aditivos anti-oxidantes
Óleos vegetais
Oxidação
Tratamento térmico de têmpera
Abstract in Portuguese
No presente trabalho são relatados os resultados obtidos através de ensaios de caracterização para os diferentes tipos de óleos vegetais estudados, no estado novo e puro, tais como viscosidade, número de acidez, índice de iodo, índice de saponificação, espectroscopia por infravermelho e curvas de resfriamento. Os mesmos ensaios foram realizados com as amostras de óleo de soja com diferentes concentrações de aditivos anti-oxidantes. As diferentes formulações feitas com óleo de soja foram submetidas ao um processo de envelhecimento acelerado, e após esse processo de oxidação, foram realizados novamente os mesmos ensaios. Pode-se então, comparar qual amostra sofreu menor oxidação durante um mesmo tempo de envelhecimento. Assim, pode-se verificar qual aditivo anti-oxidante obteve melhor desempenho, retardando o processo de oxidação no óleo de soja.
Title in English
Study of the oxidation of soybean oil with different concentrations of anti-oxidant additives for use in the quenchants to heat treatments
Keywords in English
Anti-oxidant Additives
Oxidation
Quenchants to heat treatment
Vegetable oils
Abstract in English
In this work has studied different types of vegetable oils such cotton, canola, sunflower, corn and soybean. Characterization in terms of viscosity, number of acidity, index of iodine, index of saponification and by infrared spectroscopy, were performed. Cooling performance was also evaluated. Those tests were performed before and after oxidation. Oxidation of the oils were obtained using a special apparatus, provoking degradation after 72 hours of test. Different formulations using soybean oil and antioxidants additivation were also evaluated. Better performance in terms of oxidation resistance was obtained with formulation 1% Irganox L109.
 
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dissertacaofinal.pdf (7.93 Mbytes)
Publishing Date
2008-06-20
 
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