Method for preparing main hydrolysate by hydrolyzing plant cellulose materials with concentrated sulfuric acid

摘要

The present invention relates to a method to dispose plant cellulose materials, in particular to a method for preparing a main hydrolysate by hydrolyzing the plant cellulose materials with concentrated sulfuric acid. The plant cellulose materials are mixed with sulfuric acid in batches, and the main hydrolysate is obtained after hydrolysis. The batch mixing includes the following procedures: (1) sulfuric acid solution is used to dissolve part of the plant cellulose materials thereby forming a hydrolysate; (2) when the plant cellulose materials can not be dissolved any more, concentrated sulfuric acid with the concentration more than 80 wt % is successively added into the hydrolysate, and another part of the plant cellulose materials are added; (3) and then the procedure as step (2) is repeated until all the plant cellulose materials are completely hydrolyzed. The method utilizing concentrated sulfuric acid to prepare the main hydrolysate can hydrolyze the maximum cellulose with the least sulfuric acid, thereby decreasing the acid recovery cost proportioned by per kilogram sugar obtained by hydrolysis.