Abstract
Bio-oil produced from the thermochemical treatment of lignocellulosic biomass is increasingly recognized as a potentially abundant source of renewable chemicals and fuels. Single ring phenolics and low molecular weight carboxylic acids are significant constituent compound groups found in bio-oil and are important end products or intermediate commodity chemicals. Fractionation of bio-oil using supercritical fluids (usually with CO2 as a solvent) is a relatively new process being investigated worldwide at both laboratory and pilot scales. Solubility data associated with supercritical carbon dioxide (scCO2) and the many chemical compounds in the complex bio-oil mixture are required to predict the extraction behavior of different bio-oil compounds. This article starts with a review of the composition of bio-oil in terms of the phenolic and low molecular weight carboxylic acid fractions which are potentially of commercial interest. Binary solubility data of major compounds in these bio-oil fractions with super...
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