Volume (Issue) 8 (3), July 2016

Energy Education Science and Technology Part C: Future Energy Sources

2016 Volume (issue) 8(3): 81-92




Characterization of lignin structure

of wood and non-wood lignocellulosic plants


Ayhan Demirbas*

Faculty of Engineering, Department of Industrial Engineering,

King Abdulaziz University, Jeddah, Saudi Arabia



Received: 08 March 2016; accepted 21 May 2016



     The chemical structure and lignin content of a tree varies depending on its age, trunk, roots, branch and leaves. The lignin content deciduous trees ranges from about 18%-25%, which is lower than lignin content of coniferous trees, 25%-35%. The chemical structure and lignin content highly varies in wood and non-wood plants. Lignin has highly complex polymeric structure. The lignin is a cross-linked phenolic phenylpropanoid polymer consisting of irregular bonded hydroxyl-methoxy units characterized by C9H8-xO2 and OCH3 groups. To understand the characteristics of lignin is very difficult to determine its chemical structure, you need to know the thermal properties. In this context, it can be obtained important clues by using experimental and theoretical heating values.


Keywords: Lignin; Lignocellulosics; Wood; Non-wood; Characterization; Heating value