▎ 摘　　要

NOVELTY - Preparing L-fructose involves preparing solid alkali catalyst potassium fluoride (KF)/Fe-O-GN; preparing graphene/carbon nano tube/styrene sulfonated resin filler; taking L-glyceraldehyde as raw material in presence of solid alkali catalyst KF/Fe-O-GN, adding 1,3-dihydroxyacetone and distilled water for mixing reaction, and filtering reaction liquid to remove solid alkali catalyst KF/Fe-O-GN after reaction is finished to obtain filtrate; adding graphene/carbon nano tube/styrene sulfonated resin filler into calcium hydroxide solution to converted into calcium type graphene/carbon nano tube/styrene sulfonated resin filler, adding calcium type graphene/carbon nano tube/styrene sulfonated resin filler into separation column, passing filtrate through separation column, and collecting separation solution of L-fructose section; concentrating and crystallizing separated liquid of L-fructose section to obtain L-fructose crude product, adding water to dissolve L-fructose crude product. USE - Method for preparing L-fructose. ADVANTAGE - The method for preparing L-fructose helps in improving catalytic rate to 96.4%, and solid alkali catalyst is improved by 20 to 30% compared with catalytic rates of existing liquid alkali catalyst; ensures resin to form good support network; increases selective adsorption of resin to L-fructose and purity reach 99.3%. DETAILED DESCRIPTION - Preparing L-fructose involves preparing solid alkali catalyst potassium fluoride (KF)/Fe-O-GN; preparing graphene/carbon nano tube/styrene sulfonated resin filler; taking L-glyceraldehyde as raw material in presence of solid alkali catalyst KF/Fe-O-GN, adding 1,3-dihydroxyacetone and distilled water for mixing reaction, and filtering reaction liquid to remove solid alkali catalyst KF/Fe-O-GN after reaction is finished to obtain filtrate; adding graphene/carbon nano tube/styrene sulfonated resin filler into calcium hydroxide solution to converted into calcium type graphene/carbon nano tube/styrene sulfonated resin filler, adding calcium type graphene/carbon nano tube/styrene sulfonated resin filler into separation column, passing filtrate through separation column, and collecting separation solution of L-fructose section; concentrating and crystallizing separated liquid of L-fructose section to obtain L-fructose crude product, adding water to dissolve L-fructose crude product, adding activated carbon, decoloring, filtering, concentrating, crystallizing and drying to obtain L-fructose finished product.