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ZnCl2 Enhanced Acid Hydrolysis of Pretreated Corncob for Glucose Production:Kinetics,Thermodynamics and Optimization Analysis

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Journal of Bioresources and Bioproducts 2019年第3期4卷 15-24页

作者： A I ADEOGUN B E AGBOOLA M A IDOWU T A sHITTU Department of Chemistry Federal University of AgricultureAbeokuta Department of Food science and Technology Federal University of AgricultureAbeokuta

The biomass of agricultural wastes as a source of fermentable sugars for biofuels production will address the food security and environmental preservation *** wastes are rich in lignocellulosic materials which can be hydrolyzed into fermentable ***,low sugar yield and high energy consumption are some of the challenges faced in the process of *** study investigated the low-cost corncob substrate for glucose production by dilute sulphuric acid hydrolysis in the presence of ZnCl_(2) at temperatures below 100℃after pretreatment with 10%*** dependent hydrolysis data were analyzed by saeman model,thermodynamic parameters were obtained using Erying and Arrhenius equations while Box-Behnken model(Design Expert 6.0 version)was used for experimental *** the substrate concentration increased from 50 mg/L to 150 mg/L,glucose yield increased from 10.4 mg/g to 14.6 mg/g for pretreated corncob while an increase from 3.4 mg/g to 8.6 mg/g was noted for untreated *** hydrolysis rate constant was two orders of magnitude higher than the degradation rate *** parameters revealed endothermic process with positive Gibb’s free energy of hydrolysis having average values of 84.76 kJ/mol and 79.87 kJ/mol for pretreated and untreated samples *** optimum yield from the model was found to be 177.44 mg/g with 3.94%H_(2)sO_(4) and 0.43 mol/L ZnCl_(2) for 200 g/L compared with optimum yield of 46.37 mg/g obtainable without ZnCl_(2).The results of this study showed that the alkaline pretreatment of corncob increased the accessibility of cellulose from the solid fraction and increase glucose production.

关键词： hydrolysis saeman’s model Erying equation Box Behnken model design expert alkaline pretreatment

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