▎ 摘　　要

NOVELTY - Method for purifying chromatographic n-heptane, involves (a) adding n-heptane to an UV irradiation reactor, irradiating under UV light at 185 nm wavelength, and using a strong oxidizability of the generated hydroxyl radical to oxidize and decompose the impurities in the n-heptane, (b) adsorbing, and removing impurities through chitosan-graphene oxide composite material, (c) dehydrating, and drying using anhydrous calcium oxide, (d) removing low-boiling impurities by distillation, (e) removing impurities by rectification, and (f) rectifying to obtain the chromatographic n-heptane. USE - The method is useful for purifying chromatographic n-heptane. ADVANTAGE - The method has excellent oxidation effect, and has fast rate and short cycle, and reduces the aggregation of graphene oxide, increases specific surface area, and improves adsorption performance, and produces 92% n-heptane with the purity of 99.4% and moisture content of below 0.01%.