论文部分内容阅读
通过对醋酸乙酯－茶多酚－水萃取体系的分析，采用逐级萃取的方法，研究了萃取混合时间与萃取相茶多酚浓度的关系、萃取温度对萃取过程的影响、相平衡分配比随逐级萃取平衡级数变化的规律。研究结果表明，茶多酚萃取过程以扩散传质为主，一级萃取相平衡分配比为１．６左右，萃取操作温度宜控制在１５℃以下。建议工业生产采用三级逆流萃取。
Through the analysis of ethyl acetate - tea polyphenols - water extraction system, the method of stepwise extraction was used to study the relationship between extraction and mixing time and the concentration of tea polyphenols in the extraction phase. The effects of extraction temperature on the extraction process, phase equilibrium partition ratio With the gradual extraction of the balance series changes in the law. The results showed that the mass transfer of tea polyphenols was dominated by diffusion and mass transfer, the equilibrium partition ratio of primary extraction was about 1.6, and the extraction operation temperature should be controlled below 15 ℃. Recommended industrial production using three countercurrent extraction.