不同降温速率下棕榈仁油结晶特性的对比分析

Contrastive Analysis of Crystallization Behavior of the Palm Kernel Oil under Different Cooling Rates

用在线监测设备PVM和FBRM及偏光显微镜,XRD及查式扫描量热仪(DSC)对不同降温速率下棕榈仁油的结晶特性进行了对比分析,得到不同降温速率下棕榈仁油(PKO)的结晶特征,丰富了油脂悬浮结晶分提过程研究的资料。PKO作为天然油脂存在同质多晶,实验发现当降温速率低于4 K/h时结晶产品接近文献中描述的β型表观特征,当降温速率高于8 K/h时结晶产品形态接近为β’型表观特征。通过对产品的晶型及DSC热分析,发现不同降温速率下的产品熔点及晶体特征表现不同,也为悬浮结晶分段降温的参数设定提供了一定的应用参考价值。

Crystallization behavior of palm kernel oil under different cooling rates were contrastively analyzed using In-situ analysis devices of PVM and FBRM, the crystallization products were detected by XRD, polarizing microscope and DSC. The results enriched the data of oil suspension crystallization process. Palm kernel oilcrystals show different morphologies under different cooling rates. When the cooling rate is under 4 K/h, the crystallization products are more similar to the β form as reported, while the rate exceeds 8 K/h, the crystallization products are more similar to the β＇ form. By analyzing different products under different cooling rates, it is found that different products perform different crystal behavior and melting points, which provides valuable information to the optimization of the suspension crystallization.