title: Influence of reaction conditions on the composition of liquid products from two-stage catalytic hydrothermal processing of lignin.
abstract: The influence of reaction conditions on the composition of liquid products during two-stage hydrothermal conversion of alkali lignin has been investigated in a batch reactor. Reactions were carried out in the presence of formic acid (FA) and Pt/Al2O3 catalyst. The two different sets of reaction conditions involved alternative reaction times of 1h and 5h at 265°C and 350°C, respectively. These provided different contributions to reaction severity, which affected the compositions of liquid products. Yields of liquid products reached up to 40wt% (on lignin feed basis) in the presence of FA under the less severe reaction condition. With 5h reaction time at 350°C, alkylphenols, alkylguaiacols and hydrocarbons were the dominant liquid products. However, with 5h reaction time at 265°C, phenol and methanol became dominant. The two-stage hydrothermal process led to improved lignin conversion, with the potential to manipulate the liquid product range.
authors.affiliation: Energy Research Institute, School of Chemical and Process Engineering, The University of Leeds, Leeds LS2 9JT, United Kingdom. Electronic address: j.a.onwudili@leeds.ac.uk.
authors.forename: Jude A
authors.initials: JA
authors.lastname: Onwudili
mesh_terms: D002384:Catalysis; D003198:Computer Simulation; D005561:Formates / Q000737:chemistry*; D006361:Heating / Q000379:methods; D006859:Hydrogen / Q000737:chemistry*; D007700:Kinetics; D008031:Lignin / Q000737:chemistry* / Q000302:isolation & purification*; D008956:Models, Chemical; D014867:Water / Q000737:chemistry*
chemical_list: D005561:Formates; D014867:Water; C030544:formic acid; D006859:Hydrogen; D008031:Lignin
keywords: Aromatic chemicals; Catalysis; Conversion; Hydrothermal; Lignin