摘要
以玉米秸秆原料,进行蒸汽爆破处理,比较了水蒸气蒸爆、稀酸和稀酸蒸爆3种预处理方法,通过对3种预处理过程中米秸秆纤维组分变化、纤维素和半纤维素降解产物和玉米秸秆结构分析以及酶解试验,探讨稀酸蒸汽爆破的协同作用机制。结果表明,稀酸蒸爆协同作用包括稀酸的软化和蒸汽爆破的活化两种机制:一是通过稀酸脱除大部分的半纤维素破坏了半纤维素与木质素间的相互作用,软化了纤维组织;二是软化的纤维通过蒸汽爆破冻结其活性纤维素超分子结构,增加了纤维素与纤维素酶的接触面积。
Using corn stalk as raw material, three pretreatments including water vapor steam explosion, dilute acid catalysis and dilute acid-catalyzed steam explosion were carried out in order to investigate synergy effect of steam explosion and dilute acid catalysis. For the purpose, effects of acid-catalyzed steam explosion on corn stalk were analyzed and characterized, such as composition, structure, property of the matter, forming degradable products after pretreatments and enzymatic hydrolysis. The results show that the positive effect of acid-catalyzed steam explosion attributes to the synergistic interactions of acid-softening and steam activation. First, the hemicellulose removal with acid can break the interaction between cellulose and ligin, and soften lignocellulosic structure. Second, steam explosion of acid- softened matter can lead to the forming of an active supramolecular structure, which can increase the accessibility of cellulase to celluloses.
出处
《当代化工》
CAS
2011年第12期1224-1227,1230,共5页
Contemporary Chemical Industry
