Effect of sulfuric acid addition on the yield and composition of lignin derived oligomers obtained by the auger and fast pyrolysis of Douglas-fir wood

Impact of combined acid washing and acid impregnation on the pyrolysis of Douglas fir wood

“…These results are consistent with a previous study performed by our group which found that sulfuric acid can catalyze some dehydration reactions in compounds with methoxyl groups, like those which we present here [38]. 2-Methoxyphenol is unchanged with acid addition, possibly because it has a lower boiling point due to its molecular weight.…”

“…It was found that the suppression of AAEMs with sulfuric acid actually reduced the production of methoxylated phenolic products as well as lignin oligomers [38]. Di Blasi et al found that the addition sodium, potassium, and calcium in wood pyrolysis actually enhanced the production of phenols such as guaiacol, cresol, phenol, and isoeugenol [29,39] and greatly reduced the production of lignin oligomers (pyrolytic lignin) [22].…”

Optimization of bio-oil yields by demineralization of low quality biomass

“…Raveendran et al [24] reported increased char yields from feedstocks with high lignin content after demineralization, which is an indication that the inorganics catalyze the primary decomposition of lignin. Other researchers have also noticed the reduced formation of lignin products after demineralization pretreatments [15,16,33] or after passivation of the catalytic effect of the inorganics in biomass [34,35]. The only exception in our study was the case of eucalyptus, in which the phenolic components were not reduced with the demineralized sample (Fig.…”

Characterization of Thermal and Mechanical Properties of Lignosulfonate- and Hydrolyzed Lignosulfonate-based Polyurethane Foams

“…(C-H stretching in methylene groups of the side chains), and 1595 cm -1 (aromatic skeletal vibrations) (Pohjanlehto et al 2013;Zhou et al 2013) increased, while the sulfonate (R-SO2-O -) at 1044 cm -1 and ether at 1113 cm -1 (Hu et al 2012;Faix 1992) decreased upon alkaline treatment. These changes indicate an increase in hydroxymethyl group abundance and ether bond scission resulting from the alkaline hydrolysis of lignin (El Mansouri et al 2006).…”