A kinetic study on isothermal crystallization of palm oil

Isothermal crystallization of 24 ℃ palm oil was investigated by means of differential scanning calorimetry( DSC).The thermal behavior was studied at different crystallization rate and temperature( Tc).The fundamental crystallization parameters were obtained by using the Avrami equation. The cooling curves was observed at 1,5,10,20 K / min different cooling rate,which showed that the peaks become higher,sharper and larger area with increasing rates. The temperature of crystallization( Tc) varied from- 20 ℃ to 8 ℃. Peaks shifted downward to higher and shorter times with the increasing temperature. At elevated temperatures up to- 6 ℃ peak D disappeared.When the temperature was 2 ℃,the curves of heat only had two peak,when up to 6 ℃,only had one peak.The crystal parameters showed that with the increasing of crystallization temperature,crystallization rate decreased.