Kinetic and thermodynamic analysis of dilute acid hydrolysis of sugarcane bagasse.
Bioresour Technol
; 250: 197-203, 2018 Feb.
Article
em En
| MEDLINE
| ID: mdl-29174896
ABSTRACT
This study has investigated kinetic and thermodynamic features of dilute acid (2% v/v H2SO4, 130 w/v) hydrolysis of sugarcane bagasse. Time profiles of xylose formation in range of 100°-130⯰C and treatment period of 0-120â¯min have been analysed with modified biphasic Saeman model. Generation of glucose, arabinose and inhibitory products (furfural, 5-HMF and acetic acid) have also been analysed. Easy-to-hydrolyse fraction of hemicellulose increased with temperature. Activation energies for hydrolysis and xylose degradation were 60.3 and 83.4â¯kJ/mol, respectively. Although maximum xylose yield (0.81â¯g/g hemicellulose) was obtained at 130⯰C, significant fraction of xylose was converted to inhibitory products. Thermodynamic analysis revealed ΔHâ¯=â¯57.06â¯kJ/mol and ΔSâ¯=â¯-1.05â¯kJ/mol for hydrolysis. Moreover, xylose formation is thermodynamically more favoured (ΔGâ¯=â¯468.53â¯kJ/mol) than degradation (ΔGâ¯=â¯482.17â¯kJ/mol). Optimum conditions for hydrolysis are temperatureâ¯=â¯120⯰C, timeâ¯=â¯30â¯min, xylose yieldâ¯=â¯0.76â¯g/g hemicellulose.
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Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Celulose
/
Saccharum
Idioma:
En
Revista:
Bioresour Technol
Ano de publicação:
2018
Tipo de documento:
Article