Selective fast pyrolysis of biomass impregnated with ZnCl₂: Furfural production together with acetic acid and activated carbon as by-products
2011
Lu, Qiang | Wang, Zhi | Dong, Chang-qing | Zhang, Zhi-fei | Zhang, Ying | Yang, Yong-ping | Zhu, Xi-feng
Fast pyrolysis of biomass materials impregnated with ZnCl₂ offered a promising way to obtain a liquid product rich in furfural (FF) and acetic acid (AA), and the pyrolytic solids could be used as the precursors to prepare activated carbons (ACs). In this study, a lab-scale fast pyrolysis set was designed and used for the quantitative production of the three chemicals. The maximum FF was produced from the corncob impregnated with at least 15wt% ZnCl₂ and at the pyrolysis temperature around 340°C, with the yield of more than 8wt% compared with only 0.49wt% from the raw corncob. Meanwhile, AA of around 4wt% could be obtained. The content of the FF and AA was over 50wt% and 25wt% on the water-free basis of the pyrolytic liquids. In addition, ACs were prepared from the pyrolytic solids, and they exhibited similar properties as those prepared from direct activation of ZnCl₂-impregnated biomass materials.
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