Gas Production and Fault Interpretation of Monoesters under Low Thermal Stresses

This paper discusses gas production of monoesters under low thermal stresses and evaluation of fault interpretation methods to the oils. Two kinds of monoesters, namely the monoester having C=C bond and that without C=C were heated locally at the temperatures of 200, 250 and 300 °C. Three kind of fault interpretation methods, namely Key Gas, IEC ratio, and Duval Triangle methods are examined their applicability to the monoesters. The results show that the Key Gas and the IEC Ratio methods are not applicable. For the Duval Triangle, most of the tested oils are mistakenly put into the region dedicated to the fault of carbonized paper type. Therefore, the methods fail to interpret the low thermal stresses under the current experimental conditions.