CELLULOSE; solid; repeating unit: C6H10O5; constitutes about
60% of the composition of wood; hydrolysis can reduce cellulose
to a cellobiose repeating unit, C12H22O11 and ultimately to glucose,
C6H12O6. Gross heat of combustion is 4172 kcal/kg.
LIGNIN: material is the major noncarbohydrate constituent of
wood; it is a highly polymeric substance, with a complex, cross
linked, highly aromatic structure of molecular weight about
10,000 derived principally from coniferyl alcohol (C10H12O3) by
extensive condensation polymerization. Gross heat of combustion
is 5062 kcal/kg [41].