Corrosivity of Wood Vinegar in Bio-Oil from Hazelnut Shells

Wood vinegar (WV) is the one of the primary liquid products of biomass pyrolysis, and applied as a sustainable chemical in industry and agriculture. The present work focused on the corrosivity of WV obtained from hazelnut shells pyrolysis to provide more sufficient premise reference for better application. It is found that, the optimal temperature for maximum WV yield (31.23 wt.%) was located at 700°C, the higher temperature (>700°C) was not conducive to the generation of WV, the low pH was important quality for WV, the average value of pH was 2.89 in the all selected temperatures, this is mainly attribute to the high content of phenols and acids in WV by gas chromatography-mass spectrometry technology, and phenols were the most important components, and accounted for above 41.17 wt.% in WV. Corrosive experiments showed that WV had the weaker corrosiveness than the typical formic acid, it was supported by the comparative result on the roughness, hardness, and tensile strength of the rubbers soaked in WV and formic acid, and the corrosivity decreased first and then increased with the increase of preparation temperature of WV, the WV prepared at 900 °C had the weakest corrosiveness, it revealed that the corrosivity of WV mainly were affected by the content of acids in WV, and more phenols supported the lower pH and lower corrosivity of WV, phenols were acidity similar to acids, the corrosivity were significantly less than acids.