对甲基苯磺酸预处理玉米秸秆动力学及酶解特性研究

Study on Kinetics and Enzymatic Hydrolysis Properties of Cornstalk Pretreated with p-TsOH

关键词:  对甲基苯磺酸  玉米秸秆  组分分离  动力学  酶解

Key Words:p-TsOH  cornstalk  component separation  kinetics  enzymatic hydrolysis

摘要:本研究采用对甲基苯磺酸（p-TsOH）预处理玉米秸秆，研究了3个预处理因素（p-TsOH质量分数、水解温度和水解时间）对其三大组分分离的影响。通过两相模型，得到木质素和半纤维素脱除动力学模型，并探究了处理后残渣的酶解性能。结果表明，p-TsOH预处理玉米秸秆在温和条件下即可快速溶出木质素和半纤维素，而对纤维素的降解较小；木质素脱除反应和半纤维素脱除反应的表观活化能分别为66.5 kJ/mol和50.5 kJ/mol；预处理后，木质纤维的顽抗结构被破坏，表面木质素含量降低，p-TsOH预处理可以有效提高原料的酶解得率；在p-TsOH质量分数为50%、水解温度为95℃和水解时间为40 min条件预处理后，残渣酶解得率为72.9%。

Abstract:In this study， p-toluene sulphonic acid （p-TsOH） was employed to pretreat cornstalk， and the effects of three pretreatment parameters （concentrations of p-TsOH， hydrolysis temperature， and hydrolysis time） on the separation of cellulose， hemicellulose， and lignin were investigated. The kinetic models of lignin and hemicellulose removal were obtained by using the two-phase model， and the enzymatic hydrolysis properties of the treated residue were studied. The results showed that the p-TsOH pretreated cornstalk could quickly remove lignin and hemicellulose under mild conditions but had little effect on the degradation of cellulose. The apparent activation energies of the lignin and hemicellulose removal reactions were 66.5 kJ/mol and 50.5 kJ/mol， respectively. The tenacious structure of biomass fibers was destroyed and the surface lignin content was decreased by the p-TsOH pretreatment， which improved the enzymatic yield of treated cornstalk. After pretreatment with p-TsOH concentration of 50%， hydrolysis temperature of 95℃ and hydrolysis time of 40 min， the enzymatic hydrolysis yield of the residue was 72.9%.