Process for the separation of quinoline-insoluble components from coal tar pitch
AssigneeRutgerswerke Aktiengesellschaft
InventorsJurgen Stadelhofer, Gerd Collin
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Abstract
Quinoline-insoluble components are separated from coal tar pitch by treating the coal tar pitch which has a softening point of greater than 60.degree. C. (according to the method of Kraemer-Sarnow) with a solvent mixture comprising at least one solvent with paraffinic characteristics and at least one tar solvent, wherein the treatment is carried out at a temperature in the range of 200.degree. to 270.degree. C.
Claims6
In a process for the separation of quinoline-insoluble components wherein coal tar pitch is treated with an organic solvent and the insoluble components are thereafter separated, the improvement which comprises selecting a coal tar pitch with a softening point of greater than 60.degree. C. (according to Kraemer-Sarnow) and treating said pitch with a solvent mixture comprising a paraffinic solvent selected from the group consisting of aliphatic and cyclo-aliphatic hydrocarbon solvents and a tar solvent which is an aromatic solvent obtainable from coal tar or petroleum fractions, at temperatures of 200.degree. to 270.degree. C. wherein the ratio of paraffinic solvent to tar solvent ranges from 0.2 to 1 and up to 3 to 1 and wherein the separation takes place at a temperature between 160.degree. and 200.degree. C.
Dependencies are inferred from the claim text.