Crystallization Separation Of Corn Straw Sugar And Sugar Alcohol、sugar Acid In Biorefinery

This work studied the crystallization separation of straw sugars (glucose、xylose) produced from lignocellulose, and also the crystallization separation of sorbitol and sodium gluconate produced from the bioconversion of Jurusalen artichoke and cassava starch in biorefinery. In this study, saccharification solution from corn stalks was obtained after hydrolysis by cellulase enzyme, and then studied the crystallization of glucose and xylose. Solid-liquid separation by filter press, decolorization by3%activated carbon, removed the cation and anion by resin732and resin D315respectively, rotary evaporator at50℃、60min to purify the saccharification solution, crystallization for10-12d. Then total sugar was obtained including the mixed glucose and xylose. On the other hand, it also focused on the separation of sorbitol and sodium gluconate by crystallization method. Firstly, sodium gluconate was converted into calcium gluconate by addition of calcium chloride; and then calcium gluconate and sorbitol were separated in the way of crystallization according to different solubilities of two compounds. The results showed that the two compounds could be separated by crystallization, when m(calcium chloride):m(sodium gluconate)=1.0:4.0、50%ethanol addition、1%seeds addition、crystallization at10℃for12h, and the yield of calcium gluconate was84.2%. These results provided feasible ways for the separation of sodium (calcium) gluconate and sorbitol, and also for the separation of total sugar produced from lignocellulose at low cost.