Biomedical Engineering Reference
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Figure 5.
Typical composition of products obtained from pyrolysis biomass. Maximal achievable
content of different products depends on the speed of pyrolysis.
In fact, volatile products which start to evolve intensively at 140°C during heat
treatment of
Salix viminalis
wood, partially condensate after cooling in the form of a
dark brown viscous liquid. Volatile products in condensed form seem to be useless but
besides water, alcohols, ketones, aldehydes, acids, the condensate contains a mixture
of polyphenols called “bio oil” (Figure 6). Volatiles evolution intensity depends on
temperature reaching maximum in the range 260-340°C
(Figure 7).
Antioxidant prop-
erties are routinely ascribed to many polyphenols (Rice-Evans et al., 1995; Rosicka-
Kaczmarek, 2004) of biological origin. Within the current project authors performed
separation of polyphenols in condensate and identified them by means of NMR, GC-
MS, and FTIR (Table 3). Finally, chemical antioxidants test were done using purified
condensate that is extracts from “bio oil” and some test samples that is BHT and “bio-
diesel” for engines. The BHT served as a reference commercial antioxidant.
Figure 6.
Average composition of liquid condensate obtained by carbonization of
Salix viminalis
wood.
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