Separating Cellulose and Hemicelluloses and Hydrolyzing the Pure Cellulose to Fermentable Sugars

The key of transforming the straw to chemical materials,like ethanol,is the cellulose and hemicellulose of the crop is saccharified efficiently.In this paper,the conditions of separating cellulose and hemicellulose and acidolysising the cellulose to fermentable sugars were optimized.The result is: after boiling water bath for 14h in 2.5mol·L-1,cellulose and hemicellulose was separated when the solid-to-liquid ratio was 1: 90.The purity of cellulose is 93.73%,and the yield of hemicellulose was 76.96%.If the pure cellulose was hydrolyzed in solution of sulphuric acid for 40min when the content of sulphuric acid was 22% and temperature was 121℃.The hydrolyzing ratio was 98.85%.