关键词: 椰子油, 温度梯度场, Avrami方程, 结晶动力学

Abstract:

This work studied the dry fractionation of coconut oil as a multicomponent mixture by melting and fractional
crystallization. The directional crystallization behavior of coconut oil at gradient temperatures was investigated to optimize
its crystal parameters such as crystallization temperature, melting point, cooling rate and agitation speed. As a result,
products with special properties were obtained. The Avrami equation was generally capable of fitting the crystallization of
coconut oil although some deviations were observed during the last stage of crystallization. In addition, both crystal form
and growth changed with temperature. Thus, effective fractionation of coconut oil can be achieved at gradient temperatures.

Key words: coconut oil, gradient temperature, Avrami, crystallization kinetics