利用互溶溶剂交替浸取强化植物提取过程

利用互溶溶剂交替浸取的方法,在室温下对中药大黄进行了浸取实验。实验结果显示,利用水和乙醇对大黄进行交替浸取能够极大的提高提取速率。水和乙醇的浸泡能够可逆的改变大黄颗粒的尺度和微观结构,经过水浸润的大黄颗粒体积增大,且颗粒表面呈现明显的多孔状结构。在使用互溶溶剂进行交替浸取时,微尺度上溶液组成分布的不均会引起局部湍流,从而极大的加强传质过程。

Study on process for plant extraction intensified by solvent displacement

Using water or ethanol to make up solvent,changing the composition distribution of solvent by programmed addition,the solid-liquid extraction of rhubarb,a kind of Chinese herb,is carried out at room temperature.It reveals that the extraction scheme involving the displacement of ethanol and water has distinct advantage of high relative extraction rate.Using ethanol and water to soak the rhubarb particles alternatively can change their macroscopic size and microstructure reversibly,and the particles which swell in water exhibit larger size and obvious porous surface.A clear composition difference at micro scale in solvent system which consists of miscible solvents with moderate viscosity exists,the mass transfer enhancement can be obtained due to turbulent solvent displacement.