Dilute Acid Hydrolysis of Sugar Cane Bagasse at High Temperatures: A Kinetic Study of Cellulose Saccharification and Glucose Decomposition. Part I: Sulfuric Acid as the Catalyst

Abstract

The kinetics of sugar cane bagasse cellulose saccharification and the decomposition of glucose under extremely low acid (ELA) conditions, (0.07%), 0.14%, and 0.28% H 2 SO 4 , and at high temperatures were investigated using batch reactors. The first-order rate constants were obtained by weight loss, remaining glucose, and fitting glucose concentration profiles determined with HPLC using the Saeman model. The maximum glucose yields reached 67.6% (200°C, 0.07% H 2 SO 4 , 30 min), 69.8% (210°C, 0.14% H 2 SO 4 , 10 min), and 67.3% (210°C, 0.28% H 2 SO 4 , 6 min). ELA conditions produced remarkable glucose yields when applied to bagasse cellulose. The first-order rate constants were used to calculate activation energies and extrathermodynamic parameters to elucidate the reaction mechanism under ELA conditions. The effect of acid concentration on cellulose hydrolysis and glucose decomposition was also investigated. The observed activation energies and reaction orders with respect to hydronium ion for cellulose hydrolysis and glucose decomposition were 184.9 and 124.5 kJ/mol and 1.27 and 0.75, respectively.

Lactic Acid and Biosurfactants Production from Residual Cellulose Films

“…Besides, for solubilizing purified raw cellulose from sugar cane bagasse [27], at temperatures above the proposed in this study, a higher decomposition of glucose at short periods of time was observed with the consequent lower concentration of fermentable glucose. Therefore, the operational conditions selected for further studies with residual cellulose film hydrolyzates were temperature, 130°C; reaction time, 2 h, and acid concentration, 6 %.…”

Study of an Extraction Process as the Pretreatment Step for Sugar Production from Acid Hydrolysis

“…Degradation of glucose due to the hydrolysis reaction produces compounds such as 5-hydroxymethyl furfural (5-HMF) and organic acids that have 5-HMF as a precursor, such as levulinic and formic acid [23].…”

“…Dilute acid solutions are especially useful when lignocellulosic biomass has a significant proportion of hemicellulose because the hemicellulosic fraction is more easily hydrolyzed than cellulose [22]. The hydrolysis process with dilute acid solutions facilitates the neutralization process but has a lower yield of glucose from cellulose [23]. Concentrated acid solutions require lower processing temperatures and pressures, and the hydrolysis reaction occurs at a lower process time [22].…”

Lignosulfonate-based heterogeneous sulfonic acid catalyst for hydrolyzing glycosidic bonds of polysaccharides

“…Acid and enzyme are among the most common catalysts for hydrolyzing cellulose into glucose [10,11]. In recent years, recyclable solid acids for cellulose hydrolysis have attracted great attentions [12][13][14][15][16][17][18][19][20][21]. However, achieving high selectivity and activity still remains a challenging task.…”