The pyrolytic degradation of wood-derived lignin from pulping process

Shen, Dekui; Gu, Sai; Luo, Kai; Wang, S.R.; Fang, Mengxiang

doi:10.1016/j.biortech.2010.02.078

Cited by 400 publications

(179 citation statements)

References 24 publications

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“…In contrast, the MWD curve of the lignin heated at 120 °C also showed a slight increase in Mz, corresponding to a higher molecular weight as a result of lignin condensation. These findings confirmed that depolymerization, side chain cleavage, recondensation, and carbonization occur during exposure to heat (Li et al 2007;Kacikova et al 2008;Shen et al 2010;Kim et al 2014). The infrared spectra of the dioxane lignin showed an increase in the intensity of the band at 3420 cm -1 , corresponding to the O-H stretching vibration from the alcohols (3425 cm -1 to 3400 cm -1 ), indicating the cleavage of ether bonds ( Fig.…”

Section: Resultssupporting

confidence: 78%

Chemical Alterations of Pine Wood Lignin during Heat Sterilization

Kačík¹,

Luptáková²,

Šmíra³

et al. 2016

BioResources

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This study investigated alterations in the lignin of pinewood (Pinus sylvestris L.) during heat sterilization. The Klason lignin content was determined, and the dioxane lignin was isolated. Changes in the dioxane lignin were evaluated by size exclusion chromatography (SEC) as well as Fourier transform infrared (FTIR) spectroscopy. The analyses illustrated an increase in the percentage of extractives and the amount of dioxane lignin yields, while a decrease in the acid-insoluble lignin content was also observed. Changes in the macromolecular characteristics of the dioxane lignin (molecular weight and polydispersity) were not significant (p < 0.05); however, they indicated that simultaneous degradation and condensation reactions had occurred. The FTIR spectra of the dioxane lignins showed an increase at 3420 cm -1 (O-H stretching vibration), indicating the cleavage of ether bonds. The band at 1715 cm -1 (unconjugated C=O stretching) increased after an initial decrease due to the cleavage of the β-alkyl-aryl ether bonds. Also, the band at 1660 cm -1 (conjugated C=O groups) increased, which was caused by the cleavage of the α-alkyl-aryl ether bonds.

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Section: Resultssupporting

confidence: 78%

Chemical Alterations of Pine Wood Lignin during Heat Sterilization

Kačík¹,

Luptáková²,

Šmíra³

et al. 2016

BioResources

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show abstract

“…When only the two inner wires of the thermocouple (Ø 0.24 mm) were welded on the mesh, the delay (~ 300 ms) and temperature difference became smaller (~ 30 0 C) as compared to the pyrometer but did not disappear. In accordance with our results, Prins et al 42 also measured lower temperatures when using thermocouples compared to phosphorescence. They ascribed this to heat losses via the thermocouple.…”

Section: Pilot Plantsupporting

confidence: 93%

“…Typical oil yields from lignin using fluidized bed and entrained flow reactors are between 20 and 50 wt% (Round Robin test from 2010) 30 . However, also in another, differently configured, wire-mesh reactor an oil yield of only 55 wt% 42 was obtained. The fact that a TGA residue (char) of 42 wt% was obtained (Table 3.2) shows that the type of lignin we used for our experiment would have been charred under "more conventional" pyrolysis conditions.…”

Section: Model Compounds: Cellulose Lignin Xylanmentioning

confidence: 96%

“…However previous studies have shown that this is difficult to realize 19,42 . A second pyrometer was installed in addition to the controlling pyrometer (Figure 2.2) to map possible spatial temperature differences over the mesh.…”

Section: Temperature Distributionmentioning

confidence: 97%

“…All data are reported on dry basis. 42 . We applied the first three methods in our set-up and compared them with each other.…”

Section: Pilot Plantmentioning

confidence: 99%

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