Preparation process of ascorbyl ethyl ether

The invention relates to a preparation process of ascorbyl ethyl ether. The preparation process comprises the following steps: with ascorbic acid and acetone as raw materials, carrying out reacting for 8-10 hours under the catalysis of oxalyl chloride, and then carrying out filtering, washing and drying to obtain 5,6-O-isopropylidene-L-ascorbic acid; adding alkaline-earth metal oxide into mother liquor to remove oxalic acid, hydrogen chloride and moisture, and drying acetone with a molecular sieve for reuse; dissolving an ethylation reagent, inorganic base and 5,6-O-isopropyl-L-ascorbic acid in ethanol, carrying out reacting for 6-8 hours at 40-60 DEG C, and carrying out purifying to obtain 3-ethyl-5,6-O-isopropyl-L-ascorbic acid; removing isopropyl protecting groups through an alcohol solution of hydrogen chloride, carrying out concentrating, adding a solvent with low solubility, and conducting recrystallizing to obtain the ascorbyl ethyl ether. The process solves problems in recoveryand reuse of acetone, do