Chemistry of solvents in coal liquefaction

Aiura, M.; Masunaga, Toshio; Moriya, Kikuo; Kageyama, Yoichi

doi:10.1016/0016-2361(84)90201-1

Cited by 27 publications

(8 citation statements)

References 18 publications

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“…Several attempts to measure the ability to donate hydrogen during coal liquefaction of a chemical compound have been performed. A hydrogen donor parameter is defined based on one or several of the next parameters: solubility, polarity, chemical reaction tests, mass spectrometry, structural parameters, and spectroscopic features obtained from 1 H and 13 C NMR. − …”

Section: Fundamentalsmentioning

confidence: 99%

“…Creosote oil derived solvents were used as hydrogen donors and two Australian coal samples to test the parameter. The SHDI is obtained from 1 H spectroscopic data as follows: SHDI = H d ∗% H where H d is the quotient of the integrated intensity taken between 2.65 and 2.8 ppm and the total integrated intensity, and %H is the weight percent of hydrogen in the sample. A match between SHDI and coal conversion in most of the results was obtained. By means of dehydrogenation of coal-derived solvents using sulfur as hydrogen acceptor and spectrospic NMR data, Aiura et al measured the amount of transferable hydrogens A proposal to determine the performance of solvents during coal liquefaction is based on a reaction test of a solvent and benzoyl peroxide followed by NMR spectroscopy.…”

Section: Fundamentalsmentioning

confidence: 99%

“…By means of dehydrogenation of coal-derived solvents using sulfur as hydrogen acceptor and spectrospic NMR data, Aiura et al measured the amount of transferable hydrogens …”

Section: Fundamentalsmentioning

confidence: 99%

“…• By means of dehydrogenation of coal-derived solvents using sulfur as hydrogen acceptor and spectrospic NMR data, Aiura et al measured the amount of transferable hydrogens. 42 • A proposal to determine the performance of solvents during coal liquefaction is based on a reaction test of a solvent and benzoyl peroxide followed by NMR spectroscopy. A set of four indices is determined: the donor index, the efficiency index, the scavenger index, and the recycle index.…”

Section: Energy and Fuelsmentioning

confidence: 99%

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Use of Hydrogen Donors for Partial Upgrading of Heavy Petroleum

et al. 2016

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The huge energy required to overcome the high-pressure drop in pipelines due to the high viscosity of heavy crude oils has motivated the development of technologies to improve the flow properties of these heavy hydrocarbons, such as friction reduction, viscosity reduction, and in situ upgrading. It has been reported that a series of H-donors has been used to upgrade heavy oil for their transportation (low viscosity and high API gravity). Virtually any organic compound with a low oxidation potential can serve as a useful hydrogen donor. The low oxidation potential enables the transfer of hydrogen(s) from the donor to the substrate under mild reaction conditions. The choice of donor is based on the nature of the reaction, its availability, and solubility in the reaction medium.

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Section: Fundamentalsmentioning

confidence: 99%

Section: Fundamentalsmentioning

confidence: 99%

“…By means of dehydrogenation of coal-derived solvents using sulfur as hydrogen acceptor and spectrospic NMR data, Aiura et al measured the amount of transferable hydrogens …”

Section: Fundamentalsmentioning

confidence: 99%

Section: Energy and Fuelsmentioning

confidence: 99%

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Use of Hydrogen Donors for Partial Upgrading of Heavy Petroleum

et al. 2016

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“…Hydroaromatic compounds such as tetralin are wellknown hydrogen donor solvents (Obara et al, 1983). Although hydroaromaticity of coal-derived liquids was measured by and 13C magnetic resonance and correlated with liquefaction conversions (Aiura et al, 1984;Curtis et al, 1985), assignments of shift range are still questioned. Uchino et al (1984) proposed a proton donatable quality index (PDQI) which was calculated from the donatable naphthenic hydrogen content in hydroaromatic species as analyzed by HPLC and GC/MS methods.…”

Section: Literature Surveymentioning

confidence: 99%

Solvent extract liquefaction of coal with fractionated anthracene oil and recycle solvent

Chiba¹,

Tagaya²,

Kobayashi³

et al. 1987

Ind. Eng. Chem. Res.

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To estimate a solvent ability for coal liquefaction, 26 kinds of anthracene oils with widely ranging characteristics were used for Yallourn and Taiheiyo coal liquefactions. Hydrogen contents of solvents were correlated well with Yallourn coal conversion having a large coefficient of correlation (0.90), whereas less value was obtained for Taiheiyo coal (0.81). The hydrogen donating ability (HDA) defined by the amount of dihydroanthracene produced in the reaction of the solvent with anthracene was correlated well with conversion to TS for both coals (coefficients of correlation were 0.90 and 0.94). Their relationship was applied to recycle solvents; however, smaller conversions than predicted by the regression curve were obtained. Removing n-paraffin from the recycle solvents increased coal conversion. It was considered that coal liquefaction.

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