Thermal behavior of residual lignin from lignocellulosic biomass pretreatment
DOI:
https://doi.org/10.6008/CBPC2179-6858.2021.004.0028Keywords:
Black Liquor, Waste Recover, Second Generation Ethanol, BiorefineriesAbstract
The article presents a comparative study between three different types of lignin recovered from black liquor pre-treatment of biomass for the production of second generation ethanol, being them lignins of rice, arundo and biomass mixture. As the main approach, the thermal characterization of both lignins is compared to each other. The lignins were recovered through precipitation with H2SO4 50% v/v and after washing process, infrared spectrophotometric analysis (FTIR), thermogravimetric analysis (TGA) and differential exploratory calorimetry (DSC) were performed. Through FTIR analysis the functional groups OH, C-C, C=O and C=C that are characteristic of lignins were identified. However, the TGA analysis indicated that the three lignins presented similar moisture content, and significant differences with respect to volatile and ash contents, confirming the structural complexity of the lignin. Associated with thermogravimetric analysis the lignins were submitted to DSC analysis to determine energy loss, where despite presenting two endothermic events the arundo lignin presented a lower energy absorption in relation to the rice lignins and biomass mixture.
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