The invention discloses a process for preparing
sugar from sugarcane. The process comprises the following steps: step 1, subjecting sugarcane to cleaning, chopping, squeezing and filtering successively so as to obtain
bagasse and sugarcane juice; step 2, carrying out
steam explosion on the
bagasse and collecting
bagasse having undergone
steam explosion; step 3, sprinkling a compound
enzyme solution onto the surface of the bagasse having undergone
steam explosion so as to obtain enzymatic
hydrolysate; step 4, heating the enzymatic
hydrolysate, carrying out preliming, introducing
nitrogen and carrying out
settling separation so as to obtain first
clear liquid; step 5, heating the first
clear liquid, carrying out preliming, introducing
ozone and carrying out
settling separation so as to obtain second
clear liquid; and step 6, heating the second clear liquid to a boiling state, removing impurities through filtering, carrying out cooling to
room temperature and then successively carrying out
ultrafiltration, evaporative concentration,
crystallization and purging.
Sugar prepared in the invention does not contain SO2, so the chromatic value and
turbidity value of the prepared
sugar are effectively reduced, and the purity and concentration of the prepared
sugar are improved.