The Potential Use of Whole-tree Biomass for Bio-oil Fuels

Abstract

Abstract Eight feed stocks were fast pyrolyzed at 450°C in an auger reactor. The yields of bio-oil, char, and non-condensable gases ranged from 40.3 to 60.1 wt%, 16.0 to 34.6 wt%, and 17.1 to 34.1 wt%, respectively. The composition of the non-condensable gases exit stream was determined by gas chromatography analysis and was mainly composed of carbon monoxide, carbon dioxide, and methane. Bio-oils' physical properties of pH, water content, acid value, and viscosity were investigated. Mean molecular weights and polydispersity were determined by gel permeation chromatography. The chemical compositions for the bio-oils were also investigated by gas chromatography-mass spectrometry analysis. Physical and chemical characterization showed that bio-oil produced from whole-tree pine is comparable to that from clear wood feed stocks. Bio-oil produced from whole-tree cottonwood had high viscosity rendering it unsuitable for fuels production.