甘蔗渣高沸醇预处理过程中木质素和碳水化合物的溶出规律

Dissolution Behaviors of Lignin and Carbohydrate in Bagasse during High Boiling Solvent Pretreatment

关键词:  甘蔗渣  1,4-丁二醇  高沸醇预处理  木质素  碳水化合物

Key Words:bagasse  1,4-butanediol  high boiling solvent pretreatment  lignin  carbohydrate

摘要:研究了甘蔗渣在1,4-丁二醇溶剂预处理过程中木质素、碳水化合物随保温温度和时间的溶出规律及其溶出反应动力学参数。结果表明，适合甘蔗渣1，4-丁二醇预处理的溶剂浓度为60%；在此条件下，木质素和碳水化合物的溶出反应均可分为大量溶出和残余溶出两个阶段；在这两个阶段，木质素溶出反应的活化能分别为98.6 kJ/mol和152.3 kJ/mol，碳水化合物溶出反应的活化能分别为117.4 kJ/mol和125.9 kJ/mol。当残余木质素量降至约为3.2%后，纤维素将发生严重降解。

Abstract:This paper reports the kinetic dissolution behaviors of lignin and carbohydrate in bagasse during 1,4-butanediol pretreatment. The results showed that the solvent concentration of 60% is suitable, which will be economically feasible in consideration of the solvent recycling. The lignin and carbohydrate dissolution undergoes bulk and residual stages, the activation energies of those two stages for lignin are 98.6 and 152.3 kJ/mol respectively, and 117.4 and 125.9 kJ/mol for carbohydrate respectively. The cellulose will be degraded seriously when the content of lignin in the bagasse is reduced to less than 3.2%. This data are of certain guiding significance in optimizing the pretreatment process of bagasse biorefinery using 1,4-butanediol solvent.