Pyrolysis of arylglycol-β-propylphenyl ether lignin model in the presence of borosilicate glass fibers.: I. Pyrolysis reactions of β-ether compounds

Abstract

Two β-aryl ether type model compounds, guaiacylglycol- and veratrylglycol-β-propylphenyl ethers, were copyrolyzed with borosilicate glass fibers. The results provided a better understanding of the effect of copyrolysis with the fibers on the yields of lignin-derived products from lignocellulosics. The observed products indicated the following reactions occurring in the models; (1) cleavage of the Cα-aromatic ring bond, (2) cleavage of the β-ether bond, (3) cleavage of the Cα-Cβ bond, (4) α,β-dehydration, and (5) demethylation, and others. Of these reactions, reactions (1), (2) and (4) were the main pyrolysis reactions and fully explained the increase in the total yield of lignin-derived pyrolysis products from Japanese red pine ( Pinus densiflora Sieb. et Zucc.) in the presence of borosilicate glass fibers. Reaction (1) was a particularly characteristic reaction in copyrolysis with the fibers. Important reactions relating to the increase in the total yield of lignin-derived pyrolysis products were reproduced on the models used.