Abstract:

Thermal extraction of fat coal at different temperatures and in different solvents and the properties of extracts are studied.The result shows that the extraction yield first increases with thermal extraction temperature rising,and reaches peak value at softening point,and then decreases with the rising temperature; and the extraction yield of fat coal increases obviously with solvent polarity.Thermal gravimetric and infrared analysis shows the variation of extracts structure.The feature of containing nearly no ash is expected to be the breakthrough for clean use of the coal.