Techniques of isolation and purification of theanine from tea polyphenol waste industrial liquid were studied in this paper. To get rid of tea polyphenol, protein, soluble sugar in waste industrial liquid, some of chemical technique for separation, such as flocculation, membrane ultra filtration, absorption, ion-exchange absorption and re-crystallization were employed. To optimize the techniques,conditions of techniques were studied . The result suggested that:
Focculation can efficie...