|
| Thermal stability of methyl esterified palm oil used as vegetable insulating oil |
| |
| DOI： |
| KeyWord:vegetable insulating oil thermal stability transesterification palm oil |
| FundProject: |
|
| Hits: 1425 |
| Download times: 0 |
| Abstract: |
| The application of vegetable oil used in oil insulated high voltage equipments was restricted due to its high kinematic viscosity and solidifying point. The viscosity of vegetable oil could be reduced greatly through transesterification, thus enhancing the heat dispersion. In order to investigate the thermal stability of methyl ester, NaOH was employed as catalyst for transesterification of palm oil and methanol(molar ratio of methanol to oil 9∶?1, catalyst amount 1%, reaction temperature 65?℃ and reaction time 30 min) to produce methyl ester. Thereafter, the palm oil and methyl ester were evaluated by thermogravimetry at four heating rates of 10, 20, 30, 40?℃/min. Based on the iso-conversional method, Flynn-Wall-Ozawa method and Avrami theory were adopted to calculate activation energy of thermodecomposition and reaction order, respectively. The results showed that the initial decomposition temperature was reduced after palm oil was transesterified. The average activation energy of thermodecomposition for palm oil and methyl ester were 195.57 kJ/mol and 57.14 kJ/mol, and the corresponding reaction order were 0.315-0.383 and 1.402-1.580, respectively. |
| View full text View/Add Comment Download reader |
| Close |
|
|
|
