示差熱分析と微分型熱天秤による石炭の熱分解
1964 年 43 巻 12 号 p. 849-858
詳細
1964 年 43 巻 12 号 p. 849-858
The effects of particle size, coal rank, heating rates and atmospheres, on the pyrolysis of several Japanese coals up to about 700°C have been obtained by the recording differential therm obalance reported earlier by us, and the derivatograms of coal samples above mentioned have been made by combining differential thermal analysis with-differential thermogravimetric analysis.
The results indicate that
(1) the bitumen formed by the chemical decomposition of coal plays a great important part in the caking phenomena of coal,
(2) the first sharp exothermic peak appeared at 400-500°C in DTA curves of caking coals is due to the heat of polymerization reaction of the bitumen formed at relatively lower temperatures and the radicals formed at higher temperatures, and not due to the rapid change of thermal conductivity of samples as reported previously by Boyer et al., and
(3) the second exothermic peak in DTA curves is due to the heat of aromatization and cross-linking of the polymerization products. In conclusion, the derivatographic investigation is one of the most powerful methods for the analysis of the pyrolysis of coal.
