Process for extracting lysine by ion exchange method

The present invention is ion exchange process of extracting lysine and belongs to the field of biochemical technology. The ion exchange process of extracting lysine includes heating and filtering fermented liquid, adsorbing the filtrate with strong acid hydrogen type neutral ion exchange resin, water washing the saturated adsorbed matter to eliminate impurity, elution with metal chloride solution while converting lysine into hydrochloride, eliminating metal ion from the outflow elutriant with sodium carbonate, and concentrating crystallization to obtain lysine product. The eluted ion exchange column is regenerated with hydrochloric acid and the outflow calcium chloride and other chloride solution is regulated for reuse, so as to form one benign circulation, facilitate waste water treatment and raise economic utility.