Upgrading of bio-oil by ex-situ catalytic pyrolysis and in-line esterification in fluidized bed reactor

• Published in: The Korean journal of chemical engineering 2020, 37(7), 244, pp.1174-1180
• Main Authors: Lee, Hyung Won, Jeong, Hanseob, Ju, Young-Min, Lee, Soo Min
• Format: Article
• Language: English
• Subjects: Acetals; Aldehydes; Aromatic compounds; Aromatic hydrocarbons; Beads; Biotechnology; Butanol; Catalysis; Chemistry; Chemistry and Materials Science; Esterification; Esters; Fluidized bed reactors; Fluidized beds; Hydrocarbons; Industrial Chemistry/Chemical Engineering; Ketones; Liquid phases; Materials Science; Pyrolysis; Selectivity; 화학공학
• ISSN: 0256-1115; 1975-7220
• DOI: 10.1007/s11814-020-0527-0

Ex-situ catalytic pyrolysis of Quercus mongolica over HZSM-5 and in-line esterification of pyrolysis/catalytic pyrolysis vapors with liquid phase n -butyl alcohol were carried out in a fluidized bed reactor. The ex-situ catalytic pyrolysis over HZSM-5 beads was performed to produce bio-oil containing aromatic hydrocarbons. The temperature of the ex-situ catalytic upgrading reaction was varied from 450 °C to 600 °C, and the maximum aromatic hydrocarbons yield was obtained at 450 °C. The selectivity for aromatic hydrocarbons as a function of catalytic reaction temperature varied depending on aromatic ring number, as the selectivity for mono-aromatic hydrocarbons decreased and that for poly-aromatic hydrocarbons increased with temperature. In-line esterification of the pyrolysis/catalytic pyrolysis vapors with liquid n -butyl alcohol was also carried out, and the GC/MS analysis results showed that the acids, aldehydes and ketones in the bio-oil were converted to esters and acetals.