The invention relates to a production process for glucurono
lactone, and comprises the working procedures of oxidization, hydrolization, concentration, esterification,
crystallization,
centrifugation, refinement, and product finishing. The invention is mainly and technically characterized in that the oxidation working procedure comprises the steps of completely adding amylum into
nitric acid, insulating for above 5 hours at the temperature
ranging from 37 to 43 DEG C, adding water, rising the temperature to 50-90 DEG C, and charging
compressed air to react for 2 to 4 hours, so as to ensure the amylum to be fully oxidated; the concentration end point of
hydrolysate is the baume degree being larger than or equal to 44 to 50, so that
free water in solution is descended to the lower content to be favorable for lactonization in the next step; single esterification in the esterification working procedure is changed into multiple esterification, and the water generated in the esterification is carried over with water-carrying agent after the esterification, so that the repeated esterification is performed more thoroughly; the
crystallization working procedure comprises the steps that
alcohol is not required to be added for
dilution, thereby ensuring a
crystallization mother liquor system to be improved, and being favorable for the extraction of glucurono
lactone crystallization, and also being favorable for distilling
acetic acid out of parting
mother liquor. The product total
yield rate of the invention is enhanced to 14 to 15 percent (W / W), the consumption is reduced, the
pollution is reduced, and the production cost is reduced.