Hydrothermal treatment of biomass for energy and chemicals

Pyrolysis oils are a product of fast pyrolysis or liquefaction of biomass. Those dark brown organic liquids are chemically a complex mixture and/or emulsion of water and degradation products of lignin (e.g. guaiacols, catechols, syringols, vanillins), cellulose (such as levoglucosan, dehydrated suga...

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Bibliographic Details
Published in:Energy (Oxford) 2016-12, Vol.116, p.1312-1322
Main Authors: Hrnčič, Maša Knez, Kravanja, Gregor, Knez, Željko
Format: Article
Language:English
Subjects:
Advanced materials
Biobased chemicals
Hydrothermal reactions
Supercritical fluids
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Summary:Pyrolysis oils are a product of fast pyrolysis or liquefaction of biomass. Those dark brown organic liquids are chemically a complex mixture and/or emulsion of water and degradation products of lignin (e.g. guaiacols, catechols, syringols, vanillins), cellulose (such as levoglucosan, dehydrated sugars, di-sugars, furancarboxaldehydes), and hemicellulose (such as acetic acid, formic acid). Composition strongly depends on conditions of pyrolysis process and great variety of biomass feedstock such as grasses and trees, and other sources of ligno-cellulosic material, derived from municipal waste, food processing wastes, forestry wastes and pulp and paper by-products. The present contribution will present an overview of current high pressure processes for treatment of biomass for production of energy and chemicals as well as the fundamental studies of phase equilibria of the systems pyrolysis oil/gas, which are crucial in biorefinery process design. In particular, phase equilibria of binary and ternary systems consisting of pyrolysis oil/supercritical fluid (pyrolysis oil/CO2) and (pyrolysis oil/H2) was studied in addition to the phase behavior of ternary systems of (pyrolysis oil/diesel/CO2) and (pyrolysis oil/tail water/CO2). These data are important for design of separation processes as well as for the application of these substances for commercial fuels. •Overview of current high pressure processes for treatment of biomass.•Conversion of waste biomass to biofuels and biobased chemicals.•Future perspective of hydrothermal technology as a tool to obtain advanced materials.•Supercritical fluids to improve the efficiency of the energy production processes.
ISSN:0360-5442
DOI:10.1016/j.energy.2016.06.148