- 作者: 張慶源
- 作者服務機構: Coal Conversion Laboratory, Department of Chemical Engineering, Auburn University, Auburn, Alabama 36830
- 中文摘要: Experiments are performed to investigate the effect of oxidation upon coal liquefaction in a combined pre-oxidation-liquefaction process. It is found that the air-oxidation of coal preceding liquefaction is generally detrimental to liquefaction yields for both cases with or without presence of hydrogen gas in the dissolution step, and could be highly harmful to the processes which rely solely upon hydrogen donor solvents such as 1,2,3,4-tetrahydronaphthalene. The analyses of oxidized and unoxidized coals show a significant decrease in hydrogen but increase in oxygen contents of the coal with oxidation. These factors together with the possible formation of oxygen-coal bonds and the increase in —OH and/or —COOH groups in the oxidized coal are thought to account for the decreasing conversion of oxidized coal when it is subjected to liquefaction.
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