不同程度稀酸预处理后杨木枝桠材的物料平衡分析

摘要

In order to systematically investigate the effects of acid pretreatment on the lignocellulosic biomass,poplar branch wood was pretreated by dilute acid with different pretreatment intensities.The results showed that much more xylan was dissolved than glucan and Klason lignin during the pretreatment.The dissolution of those compositions increased with the increase of pretreatment intensity.Among different factors of dilute acid pretreatment,the dissolution of acetyl groups was susceptible to acid concentration while the dissolution of xylan and acid soluble lignin was susceptible to tempera-ture.Meanwhile,the lignin granule appeared on the surface of wood chips after the dilute acid pretreatment,and the amount of lignin granule increased with the increase of pretreatment intensity.%为了全面系统地研究酸预处理过程对木质纤维生物质的影响,对杨木枝桠材进行不同程度的酸预处理.结果表明:在稀酸预处理过程中,木聚糖的降解最多,葡聚糖和Klason木素的降解较少,这些化学组分的溶出均随着预处理强度的增加而增多.在稀酸预处理的不同因素中,预处理温度对木聚糖和木素的溶出影响最大,而酸的浓度对乙酰基的溶出影响最大.同时,稀酸预处理后,木片表面会出现木素颗粒,随着预处理强度的增加而有增加的趋势.