基于生物质精炼模式的蔗渣预水解特性研究

Study on the Prehydrolytic Properties of Bagasse Based on Biorefinery Model

基于"预水解-制浆"的生物质精炼模式,对蔗渣的预水解特性进行了研究,探讨了酸用量和温度对聚戊糖脱除率和糖溶出率的影响。结果表明,预处理液硫酸浓度越高,聚戊糖的脱除率越高,得率越低;温度的提高会使聚戊糖脱除率提高,但水解得率显著下降。在温度155℃、保温时间60min、硫酸浓度0.5%的实验条件下,聚戊糖脱除率达85.25%,水解得率为66.09%。预处理液中总糖浓度为33.58g/L,单糖占总糖的72.84%,其中木糖的含量最高,葡萄糖次之。

The prehydrolysis properties of bagasse based on prehydrolysis-pulping biorefinery model was studied. And the effect of acid concentration and temperature on pentosans removing rate and sugar removing rate was discussed in this paper. The results indicated that the extraction rate of pentosans increased with the increasing of acid concentration, while the yield showed a downward trend. In addition, the removal efficiency of pentosan increased obviously at higher hydrolytic temperature. But the holoeellulose content decreased sharply at the same time. Hydrolyzed with 0.5% sulfuric acid at 155~C for 60 min, the extraction rate was up to 85.25% while the hydrolysis yield was 66.05%. The total sugars content in the prehydrolysis liquor was 33.58g/L and of which 72.84% was monosaccharides. In these monosaccharides, the content of xylose was the highest , followed by glucose.