**3.3 Flash pyrolysis**

Flash pyrolysis can be called very fast pyrolysis, because it employs very high temperature (800–1200°C), high heating rate (>1000°C/s) and extremely low vapor retention time (below 0.5 s). The condensable and non condensable gases leave the pyrolyzer and cool rapidly to form liquid fuel called bio-oil. Some part of the poor thermally stable solid fraction (bio-char) formed degrades at high operating temperature and dissolves in the liquid fraction (bio-oil), resulting in high yield of bio-oil (>70%). The more the quantity of dissolved bio-char, the more viscose and the poorer the resulting bio-oil [28]. This process is better recommended for syn-gas production.


**Table 3.**

*Degradation temperature of biomass compositions and corresponding products.*

*Pyrolysis: A Convenient Route for Production of Eco-Friendly Fuels and Precursors for Chemical… DOI: http://dx.doi.org/10.5772/intechopen.101068*
