Chemical Constituents of Macromolecular Phase of Akabira Coal

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Abstract
A Residue fraction from extraction of Akabira coal was analyzed by Curie point pyrolysis, which showed a great increase of volatile from at 500 °C to 590 °C. A GC-MS analysis of the volatile at 590 °C indicated an evident appearance of phenol derivatives, in a series of alkane, alkene, cyclohexane, benzene, and naphthalene derivatives. SEM observation indicated that pyro-coke at 590 °C melted while that at 500 °C remained unchanged. Therefore, the abruptly increasing volatile at 590 °C originates mainly from macromolecular phase of coal.