Method for recovering 7-ADCA mother liquor

The invention discloses a method for recovering 7-ADCA mother liquor. The method is characterized by comprising the following steps that 1, the PH value of the 7-ADCA mother liquor is regulated with alkali liquor; 2, the 7-ADCA mother liquor is adsorbed with resin and then desorbed with a desorbing agent, and desorbed liquor is obtained; 3, the desorbed liquor is subjected to ultrafiltration treatment for impurity removal and clarification, and mixed dialysate is obtained; 4, the mixed dialysate is subjected to nanofiltration concentration, and concentrated liquor is obtained; the concentrated liquor is used for replacing part of purified water and reused for dissolution of 7-ADCA 7-phenylacetamido-3-desacetoxy cephalosporanic acid. The mother liquor obtained after a reaction is subjected to adsorption, desorption, ultrafiltration and nanofiltration, and the obtained concentrated liquor is used for dissolving penicillin 7-phenylacetamido-3-desacetoxy cephalosporanic acid. The method is easy to operate, low in