Wood vinegar or pyroligneous acid is the water fraction that is produced during the PyroFlash process.
Raw wood vinegar is a liquid with a red-brown color. The main component is water that originates from the biomass itself and from the chemicals reactions in the reactor. The fraction is rich in carbonic acids and also contains some residual tar.
Wood vinegar contains roughly 20% organic components of which the most dominant are: acetic acid, furfural, propanoic acid, and methoxy phenols.