Effect of fractional condensation system coupled with an auger pyrolizer on bio-oil composition and properties

摘要

The effect of fractional condensation on the properties of pyrolytic oil is evaluated by assessing the number of condensation stages and temperatures used in the bio-oil recovery. By evaluating two and three condensation stages with a decreasing temperature profile, an increase in condensation efficiency of 35 % was observed when using three-condensation stages. The two fractions of bio-oil, obtained at 180 degrees C and 120 degrees C of condensing temperatures, exhibited a moisture content of 11.15 % and 23.11 % with a liquid yield of 26.1 %, 13.5 %, respectively. After a qualitative analysis, it is suggested that both oil phases could be strong candidates for their use as fuel for heating applications, or for the production of phenolic resins. Moreover, a quantitative analysis of acids and furans was performed on the third bio-oil fraction, mainly composed of water and acids. Interestingly, a majority content of butyric acid was detected, followed by acetic acid, isovaleric acid, formic acid, and propionic acid with concentrations of 93.6 g/L, 39.0 g/L, 32.0 g/L, 11.0 g/L and 9.1 g/L, respectively. Whereas furfural and HMF content quantified in the aqueous fraction reached 2.1 g/L and 1.5 g/L, respectively. Producing different acids present in this fraction appears feasible, which could have future advantages.