Name : The 37th Conference of Coal Science
Number : 37
Location : [in Japanese]
Date : September 28, 2000 - September 29, 2000
Pages 49-52
Preheat-treatment of 4 different ranking coals at low temperature (<400℃) was performed to clarify the structural changes by using XRD method and swelling technique. For low ranking coal, preheat-treatment below 300℃ increased the order of coal molecules in terms of chain entanglement by removing water, while that above 300℃ strengthened stacking of aromatic planes in coal. Upper-Freeport coal was observed fused below 400℃, but there was no significant change of its XRD when measured at room temperature. Structural change of the coals by preheat-treatment is correlated to their swelling behaviors.
