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Title
Lignin recovery from spent liquors from the ethanol-water fractionation of sugar cane bagasse
Authors
E. Felissia Fernando E. Maria Vallejos and M. Cristina Area
Received
October 16, 2009
Published
Volume 44 Issue 9 September-October
Keywords
sugarcane bagasse, lignin, pyrolysis, TG-FTIR, Py-GC/MS
Abstract
The pyrolysis characteristics of enzymatic/mild acidolysis lignin (EMAL) isolated from sugarcane bagasse were investigated by thermogravimetry Fourier transform infrared spectroscopy (TG-FTIR) and pyrolysis gas chromatography mass spectrometry (Py-GC/MS). During thermal analysis, the decomposition of EMAL was found to occur over a wide temperature range, from approximately 150 to 800 °C, while the generated solid residue was of 29% at 900 °C. Two weight loss peaks were recorded at 294 and 385 °C, respectively. The release of gaseous products and of some organic compounds from EMAL pyrolysis, detected on-line using FTIR, occurred mainly between 200 and 500 °C, corresponding quite well with the degradation curves measured by TG. The evolution of CO and organic compounds containing functional groups of C=O and 2 C–O–C marked release peaks mainly at about 300 °C, while the formation of methane, methanol and phenols usually reached the maximum peak at about 400 °C. The phenols can be further divided into G, S and H type derivatives with various substituents, as based on Py-GC/MS results. The basic understanding and insights into lignin pyrolysis and product characteristics will help design the production processes of biofuels.
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