| 摘要 |
PURPOSE:To obtain in simple operations the titled beads of good surface smoothness, useful for catalyst carrier, etc., by solvent treatment of a raw material comprising mesophase microbeads and matrix pitch to effect sedimentation of the microbeads followed by passing a liquid to separate and recover said microbeads. CONSTITUTION:(A) A raw material pitch comprising mesophase microbeads and matrix pitch, prepared by treatment of heavy oil on heating and (B) a solvent soluble for the matrix pitch but insoluble for the mesophase microbeads are put into a rinsing tank with its bottom constituted with a filter having openings passable for said microbeads to carry out rinsing. Next, either part or all of the microbeads in the above tank is introduced, through said filter, into the sedimentation tank provided downstream to effect sedimentation. The sedimented slurry of the resultant concentrated mesophase microbeads is drawn out either continuously or intermittently through the bottom of the sedimentation tank followed by passing a liquid for separation through this slurry under such conditions that said microbeads are not to be discharged, thus obtaining the objective mesocarbon microbeads. |
