Thermochimica Acta, Vol.284, No.2, 279-287, 1996
Anisotropic Crystalline Growth Developed in Bangladeshi Coking Coal During Mesophase Transformation
The anisotropy of the mesophase spherules is developed during the carbonization of extracted coking coal in the temperature range 430 to 450 degrees C. Mesophase transition is observed by the differential scanning calorimetric study. Enthalpy Delta H involved in the mesophase transformation is found to be 46.26 J/g. The growth of mesophase spherules, their coalesced structures, mosaic and flow type mosaic are observed by the polarized light technique as the evidence of graphitizing carbon. The solvent extraction of coking coal is carried out using benzene as a solvent at atmospheric pressure by Soxhlet apparatus.