Subcritical Water Hydrolysis of Sugarcane Bagasse and Coconut Husk Assisted by Carbon Dioxide

Author(s)

Forster-Carneiro, Tania ; Prado, Juliana M. ; Vardanega, Renata ; Perez, Daniel L. ; Meireles, M. Angela A. ; Ranzi, E ; KohseHoinghaus, K

• Document type: Journal article
• Source: PRES 2011: 14TH INTERNATIONAL CONFERENCE ON PROCESS INTEGRATION, MODELLING AND OPTIMISATION FOR ENERGY SAVING AND POLLUTION REDUCTION, PTS 1 AND 2; v. 37, p. 3-pg., 2014-01-01.

Abstract

The objective of this work was to evaluate the effect of operation conditions on sub/supercritical water hydrolysis (SWH) of sugarcane bagasse and coconut husk, adding carbon dioxide (CO2) as acid catalyst. The assays were carried out in a semi-bath unit equipped with a 50 mL reaction vessel. The process was conducted at 250 degrees C for 30 min, with water and carbon dioxide 20 MPa. The results of SWH of sugarcane with the addition of carbon dioxide indicate that there was no change in the content of reducing sugars in the hydrolysate (13.5%). However, for coconut husk the total reducing sugars recovered increased 15% in the hydrolysate more effectively and showed greater percentages of sugars compared to sugarcane. The pH varied indicating that other compounds were degraded by the addition of carbon dioxide to water at both raw materials. The phenolic compound analysis indicated that the fermentation inhibitors increased with carbon dioxide addition for sugarcane bagasse, and decreased for coconut husk. Therefore, the addition of carbon dioxide as an acid catalyst in the SWH of sugarcane bagasse did not improve the process, but it did improves the sub/supercritical water hydrolysis of coconut husk. Therefore, sub/supercritical water hydrolysis should be optimized individually for each raw material (AU)

• FAPESP's process: 13/15049-5 - Development of integrated systems for the analysis of bioactive compounds in natural products employing supercritical technology
• Grantee: Maurício Ariel Rostagno
• Support Opportunities: Scholarships in Brazil - Young Researchers
• FAPESP's process: 10/08684-8 - Hydrolysis of sugarcane bagasse and palm pressed fiber with sub/supercritical water and CO2: technical and economical evaluation
• Grantee: Juliana Martin Do Prado
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 11/19817-1 - Biorefinery in agricultural and food industry: recycling waste for production of new chemicals componds and biohydrogen
• Grantee: Tânia Forster Carneiro
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Young Investigators Grants