▎ 摘　　要

NOVELTY - Recovering lactose isomerization composite catalyst involves adjusting the pH value of the mixed liquid for lactose isomerization using a boron-containing composite catalyst to be 3-4. The boron-containing composite catalyst is boron hydroxide-graphene, and the graphene and boric acid form an in-situ composite of intercalation and insertion, added ethanol to the mixed liquid regulated by pH, where the volume of ethanol is 3-5 times the volume of the mixed liquid regulated by pH, boron hydroxide-graphene is precipitated, and the isomerized lactose in the mixed liquid is dispersed in the mixed liquid-ethanol uniform dispersion system, separated the precipitated boron hydroxide-graphene solid. USE - Method for recovering lactose isomerization composite catalyst. ADVANTAGE - The method effectively and quickly separates the boron-containing composite catalyst.