2017
DOI: 10.1016/j.jaap.2017.05.009
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Products of hydrothermal treatment of lignin and the importance of ortho-directed repolymerization reactions

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Cited by 20 publications
(27 citation statements)
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“…A detailed description and analytical characterization of the monomeric aromatic compounds is given in [28][29][30][31]. In addition to these monomers, a large proportion of dimeric and oligomeric structures are obtained having the following types of bonds: 5-5 (biphenyl bond), β-5 (phenylcoumaran), β-β (THF or resinol type) and β-1 (1, 2-diarylpropane).…”
Section: Mechanism Of Bond-breaking and Product Formationmentioning
confidence: 99%
See 1 more Smart Citation
“…A detailed description and analytical characterization of the monomeric aromatic compounds is given in [28][29][30][31]. In addition to these monomers, a large proportion of dimeric and oligomeric structures are obtained having the following types of bonds: 5-5 (biphenyl bond), β-5 (phenylcoumaran), β-β (THF or resinol type) and β-1 (1, 2-diarylpropane).…”
Section: Mechanism Of Bond-breaking and Product Formationmentioning
confidence: 99%
“…This was clearly showed in the comparison of BCD of hardwood organosolv lignin with softwood kraft lignin. Syringol and dimethoxyphenols are found almost exclusively in the BCD-oil of organosolv lignin with a significant amount in the monomer phase [8,28,30]. Other studies focused on the investigation of one type of wood but with different pretreatment methods applied.…”
Section: Influence Of the Processing Conditionsmentioning
confidence: 99%
“…It was not possible to analyze heavy molecular weight compounds comprised in BC2 using GC-MS or HPLC. The heavier fraction still contains oligolignols generated in the first depolymerization steps as well as repolymerization of lignin fractions [47]. Thus, we were unable to characterize the composition of BC2 with these analytical techniques, but representative infra-red spectra and molecular weight-average distributions of BC1 and BC2 were already given in a previous work [26], showing similarities with the lignin feedstock and demonstrating the higher average molecular weight of BC2, ranging from 1030 to 1400 g mol −1 .…”
Section: Analysis Of Htl Productsmentioning
confidence: 83%
“…Generally, it is observed that the alkyl group of the phenolic derivatives is placed in the ortho or para position. The importance of ortho-directed repolymerization from HTL of lignin has previously been shown 28 while para-repolymerization may also occur when the position is not substituted. The complexity of the biomass degradation means that many aldehydes and ketones may be formed from protein, carbohydrates, and lignin.…”
Section: Poplarmentioning
confidence: 93%
“…Hence, residual lignin from alkaline HTL may be better described as chemically modified lignin. 28 Even with thermochemolysis it was not possible to detect hydrocinnamic acids (see section 3.3).…”
Section: Poplarmentioning
confidence: 99%