After-treatment method for synthesizing neohesperidin dihydrochalcone from neohesperidin

The invention discloses an after-treatment method for synthesizing neohesperidin dihydrochalcone from neohesperidin, which comprises the following steps: (1) carrying out catalytic hydrogenation on neohesperidin under the action of palladium on carbon, filtering, regulating the pH value of the filtrate to 3-6, and crystallizing at normal temperature to obtain a crystal 1; (2) filtering, and adsorbing the sample in the mother liquid; (3) after adsorbing the sample, eluting the sample with purified water to remove salts in the reaction liquid; (4) eluting with 1-30% ethanol to remove impurities in the mother liquid after crystallization; (5) eluting the sample with 30-100% ethanol, and collecting the sample liquid; and (6) concentrating, and carrying out secondary crystallization. The invention solves the problem of low yield in the prior art, and fills up the blank in the technology of after-treatment of neohesperidin and synthetic sweetening agent NHDC (neohesperidin dihydrochalcone) by using resin or polyamide.