Successive sequential extractive disintegration of coal in coal-derived solvents under ambient pressure

Assam coal was successively extracted in anthracene oil, quinoline, and liquid paraffin. About 68% of the coal was rendered extractable through successive extraction in anthracene oil followed by quinoline and then finally in liquid paraffin. The combined total extractability of coal in all the solvent systems increased with an increase in the extraction time in successive extractions. Assam, Talcher, and Raniganj coals and Neyveli lignite gave more than 50% extraction yields through the successive extractive disintegration using an anthracene oil-quinoline-liquid paraffin solvent system. Possible explanations for successive extractive disintegration of coal in anthracene oil-quinoline-liquid paraffin solvents are given