DISSOLVING LAWS OF SACCHARIDE DURING SUGARCANE BAGASSE DILUTE ACID PREHYDROLYSIS
During pulping, most of the hemicelluloses are dissolved in the waste pulping liquor and combusted in alkali recycling process. However, the hemicelluloses have low heating values and can also increase the viscosity of black liquor which would add troubles to alkali recycle. To take full advantage of the hemicelluloses, they can be extracted from the materials before pulping and then be converted into new bioproducts such as ethanol, acetic acid, or chemical intermediates. In this paper, the sugarcane bagasse was hydrolyzed in dilute sulfuric acid before pulping for making full use of the hemicelluloses. The relationships between the pentaose and hexose dissolving percentage and temperatures, times and initiate dilute acid concentration in the sugarcane bagasse dilute acid prehydrolysis were investigated. The results showed that high temperature could accelerate the dissolution of carbohydrate composition. Pentaose and hexose dissolving percentage increased with the increasing hydrolysis time and could be expressed by a function with Prehydrolysis factor. With the increase of initiate dilute acid concentration, pentaose and hexose dissolving percentage increased gradually. It was found that pentaose and hexose dissolving percentage could be also expressed by a function with initiate dilute acid concentration. Based on the experimental results, the empirical models of dissolving laws of pentaose and hexose were proposed. The model was verified and the results showed that there was a good agreement between the experimental and calculated dissolving percentage, indicating that the model was justifiable to be applied to describe the dissolving laws of pentaose and hexose during the sugarcane bagasse dilute acid prehydrolysis.
sugarcane bagasse dilute acid prehydrolysis pentaose, hexose model
Jiebin Tang Kefu Chen Jun Xu Jun Li
State Key Laboratory of Pulp and Paper Engineering,China Public Laboratory of Paper Technology and Equipment, South China University of Technology,Guangzhou 510640, China
国际会议
16th International Symposium on Wood,Fiber and Pulping Chemistry(第十六届木材、纤维及制浆化学国际会议)
天津
英文
937-941
2011-06-08（万方平台首次上网日期，不代表论文的发表时间）