Estimation of hydrogen donor ability for recycle solvent on coal liquefaction.
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概要
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Hydroaromatic components in solvents for coal liquefaction reaction, by donating their naphthenic hydrogen, play an important role in stabilization of radical fragments caused by thermal repture of coal.<BR>The starting solvents AO and HAO and the recycling solvent S-1-S-6 were analysed with the HPLC-MS method to elucidate their chemical components . From the results of mass analyses for various compounds of different aromatic ring number classes, the amounts of donatable hydrogen bonded to naphthenic rings in hydroaromatic structure were estimated. These were called PDQI values (proton donor quality index), indicating the measure of hydrogen donatability. Also new procedure by <SUP>1</SUP>H-NMR were devised for estimation of PDQI. The amounts of hydrogen in the β and further positions in naphthenic rings (HPLC-<SUP>1</SUP>H-NMR (β)) and in the α position as well as further positio ns in aromatic rings (HPLC-<SUP>1</SUP> NMR (α)) were measured. These measurements were performed on compound class fractions in which the ranges of chemical shifts for various bonding hydrogens especially α hydrogens, can be precisely calculated owing to their uniform aromatic ring structure separated by HPLC. The estimates of the PDQI from the three different methods were compared, and showed fairly good agreement.<BR>Benzene soluble conversion yields of coal liquefaction were correlated with the PDQI values of each recycling solvent used for liquefaction reaction . The solvent HAO had the highest value of PDQI: from 7.7 to 10.2mg-H/g-solvent, according to the different methods described above. HAO also provided the highest yields in coal liquefaction . As solvents were recycled, their PDQI gradually decreased, and coal liquefaction yields also decreased. This phenomena indicates that hydrogen donatability of solvent gradually decreases owing to the loss of hydroaromatic naphthene hydrogen to donate to coal fragments, with repetition of recycle runs.
- 一般社団法人 日本エネルギー学会の論文
一般社団法人 日本エネルギー学会 | 論文
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