Kinetics of acid-catalysed delignification of Eucalyptus globulus wood by acetic acid

✍ Scribed by G. Vázquez; G. Antorrena; J. González

• Book ID: 104661475
• Publisher: Springer
• Year: 1995
• Tongue: English
• Weight: 440 KB
• Volume: 29
• Category: Article
• ISSN: 0043-7719
• DOI: 10.1007/bf00202086

✦ Synopsis

The kinetics of HCl-catalysed delignification of Eucalyptus globulus wood by 70% (w/w) acetic acid solution were satisfactorily explained by a model in which 5% of the lignin fraction could not be eliminated and the remaining 95% was eliminated by a single process which, in view of the activation energy calculated from the data was attributed to the hydrolysis of ct-aryl ether bonds. The selectivity of the process was effectively independent of HC1 concentration and operating temperature for pulp yields > 50%. At high temperature (160 ~ and catalyst concentration (0.027 M HC1), lignin condensation and precipitation became significant and the data were better ftted by a model comprising two consecutive processes: lignin solubilization followed by lignin condensation.