Keywords
Lignin
chemical composition
calorific value
Fourier Transform Infrared analysis
How to Cite
Abstract
Lignin is of great interest due to the existence of large scale manufacturing processes dependent on retrieving the polysaccharide component of plants. In this study, lignin extracted through acid and alkaline hydrolysis was characterized in order to quantitatively determine the energy value of lignin in mill-wood residues. The calorific, mineral elements, chemical and functional groups of compounds present in the extracted lignin was determined using standard methods. The acid insoluble lignin content ranged from 28.0 to 31.70% while alkaline soluble lignin ranged from 24.57 to 31.77%. The volatile matter, fixed carbon and heating value showed that lignin is a major energy bearing compound in the mill-wood residues with value range of 27.6 – 35.31%, 53.32 – 68.57% and 30.13 – 32.79 KJ/Kg respectively. The ash fraction predominantly contained Aluminum but low in iron, magnesium potassium, calcium, manganese, lead, zinc and copper. The values of the mineral elements in the milled-wood residue lignin are below the range of fuel causing fouling problem during combustion, hence the fuel from these mill-wood residues are not expected to cause fouling problem. Furthermore, Fourier Transform Infrared (FT-IR) analysis revealed the presence of Alkanol (O-H), Amine (N H), Phosphine (P-H), Carboxyl (C=O), Nitroso (N=O), Nitro (N-O) and Alkane (CH, CH2, and CH3) compounds at various concentration and frequency
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