Aqueous phase preparation method of ellagic acid

The invention discloses a water-phase preparation method of ellagic acid. The water-phase preparation method comprises the following steps: (1) heating an ellagic acid crude product with the purity of 70-90%, and uniformly dispersing the ellagic acid crude product in a NaOH solution; (2) adding activated carbon into the material obtained in the step (1), heating and uniformly stirring; (3) carrying out suction filtration on the material obtained in the step (2), washing the obtained filter cake with water, carrying out suction filtration, combining the filtrates obtained by the two times of suction filtration, and adjusting the pH value with an HCl solution; (4) performing suction filtration on the material obtained in the step (3) to obtain a filter cake; and (5) re-dispersing the filter cake obtained in the step (4) with water, stirring, washing with water, carrying out suction filtration, centrifuging, and drying the precipitate obtained by centrifuging, thereby obtaining the product. According to the meth