Hydrolyzing method of cellulose and hemicellulose in waste plant

Abstract

A hydrolyzing method of cellulose and hemicellulose in waste plant, comprises the following steps: adding hydrochloric acid in 15-20wt% concentration into finely divided waste plant in a sufficient amount to flood the waste plant, heating the mixture by microwave for 1-2h at the temperature of 100-110 DEG C, putting the waste plant and hydrochloric acid processed by microwave into a high pressurereaction vessel to maintain for 1-2h at the air pressure of 1.2-1.35MPa and the temperature of 120-140 DEG C to hydrolyze, then filtering the prepared substance, separating hydrolysate and residue toobtain a hydrolysate. The obtained hydrolysate is subject to hydrochloric acid recycling to separate hydrochloric acid and monosaccharide liquid, the monosaccharide liquid can be further used for theproduction of fuel ethanol. The hydrolyzing method has the advantages of low cost, simple technology, convenient for the recovery of hydrochloric acid, and preventing the deterioration of working environment.

Description

technical field

[0001] The invention relates to the field of renewable resources—the utilization of waste plants, in particular to a method for hydrolyzing various waste plants containing cellulose and hemicellulose into glucose and xylose. Background technique

[0002] At present, many departments in our country are developing and utilizing renewable resources—especially waste plants—to produce fuel ethanol, and some large enterprises are conducting trial production, but the problem in the existing technology is the cellulose and hemifibers in waste plants The cost of the process of turning cellulose into glucose and xylose is too high, which affects the production cost of the entire fuel ethanol, so that it cannot be put into mass production.

[0003] Most of the methods of prior art experiments and trial production use dilute sulfuric acid to hydrolyze hemicellulose to obtain xylose, and then add cellulase to the residue containing cellulose and lignin to hydrolyze cellul...