Coliquefaction of lignin and bituminous coal

Coughlin, Robert W.; Davoudzadeh, Faegh

doi:10.1016/0016-2361(86)90148-1

Cited by 41 publications

(17 citation statements)

References 23 publications

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“…However, the existence of non-catalytic synergistic effect remains controversial. Some researchers [43,[57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][101][102][103][104][105][106][107][108] have shown evidence of synergy between biomass and coal while others [44][45][46][47][48][49][50][51][52][53][54][55][56] found no evidence of synergy. Trevor and Kandiyoti [109] pointed out that the way biomass components are intermeshed affects the distribution of pyrolysis products.…”

Section: Synergy Through Other Mechanismsmentioning

confidence: 99%

“…There is clear evidence of the interaction during co-liquefaction of some fuels. The earliest depiction of synergy mechanisms during co-liquefaction is probably by Coughlin and Davoudzadeh [102]. In their experiment, they co-liquefied lignin and Illinois No.…”

Section: Synergy Through Other Mechanismsmentioning

confidence: 99%

“…The hydrogen transfer mechanism between coal and solvents during coal liquefaction can provide some clue in the investigation of synergistic effects between coal and biomass during pyrolysis/devolatilization. In fact, co-liquefaction of coal and lignin [102], as well as coal and tire [105] have displayed significant synergies owing to the same mechanism. Similar mechanisms have been found during pyrolysis of solvent swollen coals [122][123][124][125] and coal impregnated with polyolefin [114].…”

Section: General Assessmentmentioning

confidence: 99%

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A Review of Thermal Co-Conversion of Coal and Biomass/Waste

2014

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Abstract:Biomass is relatively cleaner than coal and is the only renewable carbon resource that can be directly converted into fuel. Biomass can significantly contribute to the world's energy needs if harnessed sustainably. However, there are also problems associated with the thermal conversion of biomass. This paper investigates and discusses issues associated with the thermal conversion of coal and biomass as a blend. Most notable topics reviewed are slagging and fouling caused by the relatively reactive alkali and alkaline earth compounds (K 2 O, Na 2 O and CaO) found in biomass ash. The alkali and alkaline earth metals (AAEM) present and dispersed in biomass fuels induce catalytic activity during co-conversion with coal. The catalytic activity is most noticeable when blended with high rank coals. The synergy during co-conversion is still controversial although it has been theorized that biomass acts like a hydrogen donor in liquefaction. Published literature also shows that coal and biomass exhibit different mechanisms, depending on the operating conditions, for the formation of nitrogen (N) and sulfur species. Utilization aspects of fly ash from blending coal and biomass are discussed. Recommendations are made on pretreatment options to increase the energy density of biomass fuels through pelletization, torrefaction and flash pyrolysis to reduce transportation costs.

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Section: Synergy Through Other Mechanismsmentioning

confidence: 99%

Section: Synergy Through Other Mechanismsmentioning

confidence: 99%

Section: General Assessmentmentioning

confidence: 99%

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A Review of Thermal Co-Conversion of Coal and Biomass/Waste

2014

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“…Based on the liquefaction mechanism, lignin was firstly depolymerized into several substituted phenoxyl radicals at 300°C. The phenoxyl radicals then resulted in depolymerization of coal, thus promoting the liquefaction of coal [12,13]. It can also be considered that Co-thermal Dissolution (CTD) of coal and lignin will promote Thermal Dissolution (TD) of coal through the generation of phenoxyl radicals from the thermolysis of lignin at low temperature.…”

Section: Introductionmentioning

confidence: 99%

Thermal Dissolution of Shenfu Sub-Bituminous Coal Promoted by Lignin

Wu¹,

Shui²,

Yang³

et al. 2018

TOEFJ

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Objective: Thermal Dissolution (TD) and Co-thermal Dissolution (CTD) of Shenfu (SF) coal and lignin were studied. The effect of temperature on the TD and CTD of SF coal and lignin was discussed. Method: The synergistic effect of SF coal and lignin in CTD was probed with the characterization of thermal dissolution soluble fraction by elementary analysis, FTIR and TG determinations. Result: The results suggested that TD activity of lignin was higher than that of SF coal. Both SF coal and lignin gave their maximal thermal dissolution yield (TDY) of 57.6 and 82.5%, respectively at 360oC. In CTD of SF coal and lignin process, the experimental values (expressed by EXP) of TDY and Thermal Dissolution Soluble Yield (TSY) were both higher than the corresponding calculated weighted mean values (expressed by CAL) of TDY and TSY obtained from the individual TD of SF coal and lignin, suggesting that there existed a synergistic effect in the CTD of SF coal and lignin. Both TDY and TSY in CTD were enhanced to maximal values at 360oC with (EXP-CAL) values of 3.4 and 7.5%, respectively. Conclusion: There were interactions between SF coal and lignin in the CTD process. The pyrolysis of lignin at low temperature may form some intermediates such as phenoxy radicals, and these intermediates can further cause depolymerization of coal, thus promoting the TD of coal.

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“…45 mass%). In order to improve the yields of liquid products, tetralin has been used as a hydrogen donor in lignin depolymerization reactions (Coughlin and Davoudzadegh, 1986;Lalvani et al, 1991). McMillen et al (1987) reported that diphenyl ether, one of the coal model compounds, can be converted into phenol with a very high yield in the presence of tetralin.…”

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confidence: 99%

Pyrolysis of kraft lignin in molten ZNCL₂‐KCL media with tetralin vapor addition

1995

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Kraft lignin was pyrolyzed in molten salt media of ZnC1,-KCI mixture with tetralin vapor added in 0.4 and 4 mol% diluted with N, in the temperature range of 400 to 700°C. The gas chromatographic analyses of pyrolysis products revealed that the yield of H, was not increased by tetralin vapor addition. This fact implies that the hydrogen radical produced from tetralin is consumed in the formation of phenolic compounds and light liquids but not in the formation of H,. p-Cresol was the most abundant phenolic compound. The yield of total phenolic compounds with 4 mol% tetralin vapor added was increased by ca. 80% as compared to that in neat pyrolysis of Kraft lignin. On a pyrolyse de la lignine haft dans des melanges de ZnC1,-KCI sous forme de sels fondus dans lequel on a ajoute de la vapeur de tetraline a 0,4 et 4% molaire diluee avec du N,, dans une gamme de temp6ratures de 400 a 700°C.Les analyses par chromatographie gazeuse des produits de pyrolyse montrent que le rendement de H, n'augmente pas avec I'addition de vapeur de tetraline. Ce fait suggtre que le radical hydrogtne produit par la tttraline est consomme lors de la formation des composants phenoliques et des liquides lkgers mais non dans la formation de H,. Le p-Cresol est le composant phenolique le plus abondant. Le rendement des composants phholiques totaux avec ajout de 4% molaire de vapeur de tetraline augmente approximativement de 80% comparativement au rendement de la pyrolyse simple de la lignine haft.

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Coliquefaction of lignin and bituminous coal

Cited by 41 publications

References 23 publications

A Review of Thermal Co-Conversion of Coal and Biomass/Waste

A Review of Thermal Co-Conversion of Coal and Biomass/Waste

Thermal Dissolution of Shenfu Sub-Bituminous Coal Promoted by Lignin

Pyrolysis of kraft lignin in molten ZNCL₂‐KCL media with tetralin vapor addition

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Coliquefaction of lignin and bituminous coal

Cited by 41 publications

References 23 publications

A Review of Thermal Co-Conversion of Coal and Biomass/Waste

A Review of Thermal Co-Conversion of Coal and Biomass/Waste

Thermal Dissolution of Shenfu Sub-Bituminous Coal Promoted by Lignin

Pyrolysis of kraft lignin in molten ZNCL2‐KCL media with tetralin vapor addition

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Pyrolysis of kraft lignin in molten ZNCL₂‐KCL media with tetralin vapor addition