Study on Phenolic Content in Fast Pyrolysis Oil Obtained from the Model Compounds of Three Major Components in Biomass

摘要

The aim of this paper is to research variation of phenolic yields in bio-oil and the effect of interactions of three components in biomass, fast pyrolysis experiments were done with cellulose, xylan (as an alternative to hemicellulose) and lignin in tube furnace at different temperatures. Phenolic yields in liquid product analyzed by using Gas chromatography-Mass spectrometry (GC-MS) were divided into four groups: phenols, H-phenols, G-phenols and S-phenols. In single component oil, S-phenols yield was hardly any. There were trends for phenols, H-phenols and G-phenols that were consistent with temperature increasing from 450 to 550°C. And in cellulose oil, H-phenols was prone to dehydroxylation near 500°C. The phenolic compounds yields in lignin oil reached 25.98% at 550°C. For two-component oil, the yields of phenols and G-phenols increased due to the interaction of cellulose-lignin, while that of H-phenols decreased. The interaction of xylan-lignin was similar with cellulose-lignin. The interaction of cellulose-xylan on phenolic yields was relatively weak. S-phenols generated in maize straw pyrolysis oil and the phenolic total yeild in the oil was higher than modular materials oil. Interaction among three components inhibited phenols yields and restrained G-phenols at 550°C remarkablely.