Kinetic Study on the Acid Hydrolysis ofCenchrus ciliarisParticles for the Production of Xylose and Other Monosaccharides

Abstract

An experimental study on the acid hydrolysis of Cenchrus ciliaris particles was conducted. Input variables included particle size of the raw material (<0.053 mm and 0.16 mm), sulfuric acid concentration (0.05 and 0.15 M), and reaction temperature (120−150 °C). Output variables included the concentrations of xylose, glucose, arabinose, and furfural in the aqueous solution. Five chemical reactions involving the hydrolysis of the Cenchrus ciliaris particles and the decomposition of the monosaccharides were proposed, and a pseudohomogeneous model consisting of five ordinary differential equations was developed. By means of numerical techniques, the values of the parameters of the Arrhenius equation for all chemical reactions were determined. Good agreement between the model predictions and the experimental data was obtained. The hemicellulose in the Cenchrus ciliaris particles was represented by an empirical formula containing 55 units of xylan, 25 units of glucan, and 19 units of arabinan oligomers.

Dilute Acid Hydrolysis of Cowpea Hulls: A Kinetic Study

“…A similar trend of rise and fall in glucose yield was also observed by [12] in their kinetic study on acid hydrolysis Cenchrus ciliaris. Reference [13] obtained optimum condition for wheat bran pre-treatment to be: acid concentration of 1.75% (w/v), at 190 °C for 10 min.…”

“…A similar trend was also observed with 15% acid concentration which gave activation energy 82.204 KJ for K 1 and 60.499 KJ for K 2 . Reference [12], obtained activation energy of 24KJ/mol for glucose formation in a acid hydrolysis of Cenchrus ciliaris particles. Reference [16], obtained the activation energy value of 29.96KJ for glucose production form cassava root sieviate using 10% acid concentration.…”

Green biorefinery — the ultra-high hydrolysis rate and behavior ofPopulus tomentosahemicellulose autohydrolysis under moderate subcritical water conditions

“…Therefore, the hydrolysis rate of various monosaccharides is arabinose, rhamnose and xylose. The results show that the hydrolysis rate of monosaccharide is directly proportional to its removal efficiency, 42 In a study on a hydrolysis model of the three pentoses, the fastest hydrolysis was observed for methyl pyran arabinose with glycosylates in hemicellulose, 43 which led to the complete removal of arabinose at 160 C, while rhamnose could be completely removed at 170 C. To sum up, increasing the temperature can make the slow removal stage and the fast removal stage complete the reaction rapidly during the heating process, and improve the removal rate of arabinose, that is, the complete removal time is shortened from 120 min to 30 min.…”

Using a Novel Pervaporative Sequential-Co-immobilized Two-Sectional Bioreactor with an Ultralow Fouling–Biofouling Superhydrophobic Silicallite-1/PDMS Membrane to Enhance Bioethanol Production

“…Co-culture of two strains also has its own problem, including the destructive interactions between strains. 3,4,6,17 Furthermore, conversion of high sugar levels was rarely considered in PMBR, which could decrease the needed footprint and cost. Immobilization could be used as a helpful method to neutralize the different inhibitions such as interactions and high compound levels.…”

“…Recombinant strains cannot perform well on an industrial scale. Co-culture of two strains also has its own problem, including the destructive interactions between strains. ,,, Furthermore, conversion of high sugar levels was rarely considered in PMBR, which could decrease the needed footprint and cost. Immobilization could be used as a helpful method to neutralize the different inhibitions such as interactions and high compound levels. , In our previous study, the effect of various cultivation strategies using P. stipitis and Z. mobilis strains was studied, among which the sequential-co-immobilized cultivation via CA beads was selected as having synergistic interaction.…”