The characterization chart for coal-derived liquids. An evaluation method of a hydrogen donor capacity of solvents used in coal liquefactions.:An Evaluation Method of a Hydrogen Donor Capacity of Solvents Used in Coal Liquefactions
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The characterization chart proposed by authors is shown to be very useful to analyze a reaction pathway of hydrogenation reactions of coal-derived oils and to evaluate a hydrogen donor capacity of the solvents.<BR>The amount of the hydrogen donor capacity, ΔH<SUB>2</SUB>, increased for the hydrogenation reaction can be estimated by the following equation.<BR>ΔH<SUB>2</SUB>=37× (Δfa) ΔH<SUB>2</SUB>: (mol-H<SUB>2</SUB>/kg-solvent)<BR>where (Δf<SUB>a</SUB>) is a difference of the aromaticities of the solvent between before and afterthe hydrogenation reaction. This equation holds in the following conditions the reaction pathway for the hydrogenation is only the partial hydrogenation of aromatic ring and not the aromatic ring opening reaction. Furthermore the products do not contain the partially hydrogenated compounds like decaline type and perhydro-compounds, since they do not have donor capacity. The generation of these type hydrogenated compounds lead to the increase Δf<SUB>a</SUB>, but the decrease of the hydrogen donor capacity.<BR>To prove the above relation, a coal-liquefaction reaction was carried out using an anthracene and hydrogenated anthracene oils with different hydrogenation reaction depths. As the result of a kinetically analysis, the reaction rate constant kb clearly showed the maximum peak in the plot of kb versus (1-f<SUB>a</SUB>). This suggests that this evaluation method for the hydrogen donor capacity is reasonable. There are optimum conditions in the hydrogenation reaction of the solvent. A excessive hydrogenation of the solvent causes to not only a decrement of kb, but also uneconomy because of the increasing in hydrogen consumption.
- 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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