绿液预处理过程中杨木木质素结构的变化
首发时间:2014-01-28
摘要:以绿液(Na2S和Na2CO3)对杨木进行预处理,研究了预处理条件对木质素脱除的影响,并用碱性硝基苯氧化表征预处理后木质素化学结构特征的变化。结果显示,随着H-因子的升高和用碱量的增加,预处理浆料的木质素脱除率上升,木质素碱性硝基苯氧化的产物总得率及非缩合部分的S/V摩尔比下降。杨木浆料残余木质素的缩合程度随着木质素脱除率的增加而增大,且紫丁香基丙烷结构比愈疮木基丙烷结构在绿液预处理过程中更容易断裂。
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Structural Changes of Poplae Lignin in Green Liquor Pretreatment
Abstract:Green liquor (Na2S and Na2CO3, GL) was used as a pretreatment on poplar wood, and the effects of GL pretreatment on lignin removal, as well as lignin structure were investigated. The residual lignin in GL pretreated poplar was characterized by alkaline nitrobenzene oxidation (NBO). With the increasing of TTA charge and H-factor in the process of GL pretreatment, lignin can be effectively removed. The yields of total NBO products, as well as the S/V molar ratio decreased. It could be deduced that the condensation degree of residual lignin in pretreated solid increased with the lignin removal, and the syringyl lignin was more degradable as compared to guaiacyl type during green liquor pretreatment.
Keywords: poplar green liquor pretreatment lignin alkaline nitrobenzene oxidation
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No.4583591858341139****
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