The proportional composition of cellulose, hemicellulose, lignin, and minerals in a biomass plays a significant role in the proportion of pyrolysis products (bio-oil, char, and gases). Traditionally, the composition of biomass is chemically determined, which is a time consuming process. This paper presents the results of a preliminary investigation of a method using thermogravimetric analysis for predicting the fraction of cellulose and lignin in lignin-cellulose mixtures. The concept is based on a newly developed theory of pyrolytic unit thermographs (PUTs). The PUT is a thermograph showing rate of change in biomass weight with respect to temperature for a unit weight loss. These PUTs were used as input for two predictive mathematical procedures that minimize noise to predict the fractional composition in unknown lignin-cellulose mixtures. The first model used linear correlations between cellulose/lignin content and peak decomposition rate while the second method used a system of linear equations. Results showed that both models predicted the composition of lignin-cellulose mixture within 7–18% of measured value. The promising results of this preliminary study will certainly motivate further refinement of this method through advanced research.
Determination of Composition of Cellulose and Lignin Mixtures Using Thermogravimetric Analysis
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Singh, K., Risse, M., Das, K. C., and Worley, J. (May 19, 2009). "Determination of Composition of Cellulose and Lignin Mixtures Using Thermogravimetric Analysis." ASME. J. Energy Resour. Technol. June 2009; 131(2): 022201. https://doi.org/10.1115/1.3120349
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