Lignin was selectively converted into single chemical species in
water–p-cresol mixtures at 673 K. Complete depression of char formation was realized in a mixture of 1.8 g of water
and 2.5 g of p-cresol. The frame structure of lignin was efficiently decomposed within
a reaction time of 4 min. The species obtained had a molecular weight of
214 (M+)
assigned by gas chromatography–mass spectroscopy and was
identified as hydroxylphenyl-(hydroxyltolyl)-methane (HPHTM) by
1H
and 13C
nuclear magnetic resonance. Its yield approached the maximum of 80% C at min of reaction time. HPHTM was presumably produced by the addition of
p-cresol at the
most active C α
position of the hydroxyphenylpropane derivative that was formed by the hydrolysis of
lignin.
BACKGROUND: Sea algae cellulose has been little utilized because the cellulose content in sea algae is low. For the effective utilization of sea algae cellulose, cellulose must be converted without drying into valuable material with a high rate and yield. From this viewpoint, effects of hydrothermal pretreatments of sea algae to enhance the glucose production by enzymatic hydrolysis of sea algae cellulose were investigated.
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