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Poster Presentation 1-26
Influence of Pressure in Ethanol/Water Pulping of Sugarcane Bagasse
Adilson R. Gonçalves and Denise S. Ruzene
Depto. Biotecnologia – FAENQUIL CP 116, CEP 12.600-000 Lorena, SP, Brazil
Telephone: 55-12-553-3422, ext. 235; Fax: 55-12-553-3165; E-mail: adilson@debiq.faenquil.br
Ethanol/water organosolv pulping of sugarcane bagasse was performed in 200-mL closed vessels, using a 1:1 ratio of ethanol/water mixture (v/v), a 1:10 ratio of bagasse to solvent, and time varying from 1 to 3 h. The reaction and activation volumes were studied. The vessel was pressurized with argon (inert gas) at pressure varying from 0.5 to 1.5 MPa. For the reaction volume, the temperature and time were constant and pressure was varied; for the activation volume, the temperature was constant and the pressure and time were varied. Degradation of cellulose was not increased by the pressure with positive reaction volume (4100 cm3/mol); however, degradation of xylans (polyoses) and lignin was strongly increased by the pressure and the reaction volume ranged from -1000 to -3000 cm3/mol. Activation volumes were positive for all sugarcane bagasse components, showing that the transition state is larger than the original macromolecules and that the use of pressure is not advantageous for the activation.
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