A new coal flash pyrolysis method utilizing effective radical transfer from solvent to coal

Miura, Kouichi; Mae, Kazuhiro; Asaoka, Seiji; Yoshimura, Tomonori; Hashimoto, Kenji

doi:10.1021/ef00026a020

Cited by 61 publications

(31 citation statements)

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“…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]. Miura et al [122] concluded that "to supply the radicals to coal effectively and to increase the total volatile matter, the formation rate of the radicals must match that of the radical fragments from coal at first.…”

Section: General Assessmentmentioning

confidence: 67%

“…Similar mechanisms have been found during pyrolysis of solvent swollen coals [122][123][124][125] and coal impregnated with polyolefin [114]. Miura et al [122] concluded that "to supply the radicals to coal effectively and to increase the total volatile matter, the formation rate of the radicals must match that of the radical fragments from coal at first. Furthermore, both radicals must be close enough spatially to react with each other, because the reaction rates among the radicals are much faster than the transport rate of the radicals."…”

Section: General Assessmentmentioning

confidence: 67%

“…While extensive studies have been conducted on free radicals release during coal pyrolysis [115][116][117][118][119][120][121][122][123][124], such studies involving direct in situ observation of radicals released during biomass or biomass components (cellulose, hemicelluloses and lignin) pyrolysis are lacking. Understanding the mechanism of free radicals release during biomass/biomass components pyrolysis can pave the way to improvements in the modeling of coal and biomass blends during co-pyrolysis/co-gasification, and the synergistic effect between coal and biomass; therefore, providing an insight to the prediction of co-conversion of coal and biomass.…”

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: General Assessmentmentioning

confidence: 67%

Section: General Assessmentmentioning

confidence: 67%

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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“…[99][100][101][102] Serio et al demonstrated that this was due to the cross-linking reactions caused by the decomposition of oxygen functional groups. 102 On the other hand, the oil yield was successfully increased by demineralization, 103 solvent swelling 101,104 or alkylation of coal. [105][106][107] These results suggest that the secondary interactions such as cation linkage and hydrogen bonding are related to the retrogressive reactions.…”

Section: Coal Dissolution Depolymerization and Retrogressive Reactionsmentioning

confidence: 99%

Clean liquid fuels from direct coal liquefaction: chemistry, catalysis, technological status and challenges

Vasireddy

Morreale

Cugini

et al. 2011

Energy Environ. Sci.

334

209

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Increased demand for liquid transportation fuels coupled with gradual depletion of oil reserves and volatile petroleum prices have recently renewed interest in coal-to-liquids (CTL) technologies. Large recoverable global coal reserves can provide liquid fuels and significantly reduce dependence on oil imports. Direct coal liquefaction (DCL) converts solid coal (H/C ratio z 0.8) to liquid fuels (H/C ratio z 2) by adding hydrogen at high temperature and pressures in the presence or absence of catalyst. This review provides a comprehensive literature survey of the coal structure, chemistry and catalysis involved in direct liquefaction of coal. This report also touches briefly on the historical development and current status of DCL technologies. Key issues, challenges involved in DCL process and directions for the future research are also addressed.

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“…Some studies have shown that swelling coal by solvent can break hydrogen bonds and suppress cross-linking reactions [18,19]. But whether this suppressing effect is caused by the pyridine disrupting hydrogen bonds is not certain, because extraction of the coal is usually unavoidable and some small molecules are removed from the coal sample when pyridine acts as a solvent to swell coal.…”

Section: Pyridine Adsorption Behavior Of Coalmentioning

confidence: 99%