| 摘要 |
PURPOSE:To remove unstable matters readily, recover solvents on a high-purity level and obtain raw material for high-purity carbon products, by heating a specified coal-based pitch adding a ketone solvent under normal or high pressure, removing formed insoluble precipitates and separating the solvent. CONSTITUTION:Tars obtained as byproduct of coal distillation or solid coal- based substances having no fluidity at room temperature which are obtained by removing the whole of components with a boiling point of 270 deg.C or lower and a part or the whole of components with a boiling point of 360 deg.C or lower, are heated to above 40 deg.C and in a closed system under normal or higher pressure, a ketone solvent having a boiling point of below 200 deg.C (e.g. acetone) is added under stirring in an amt. of 0.5-3.0 times as much as the coal-based heavy substances to form insoluble precipitates (quinoline insolubles) and separate them as stable particulate solids. The deposits are removed by static separation, centrifugal separation or filtration. Then the ketone solvent in the mixed solution is recovered on a high-purity level for recycling through utilization of large difference in boiling point to obtain a raw material for production of high-purity carbon products such as carbon fiber and coke in needle form which is readily converted into graphite.
|
