Name : [in Japanese]
Location : [in Japanese]
Date : October 20, 2022 - October 21, 2022
Pages 20-21
We have proposed a novel coal pre-treatment method that combines oxidation reactions by molecular oxygen and the following reduction reactions by coexisting gaseous formic acid to upgrade a bituminous coal at 90°C-150°C under atmospheric pressure. It was found that the softening and melting performance of the treated coals was enhanced when oxygen and formic acid existed in gas phase at the same time at 90‒130°C. The amount of low-molecular-weight compounds (LMWC) in the coal significantly increased by the treatment, increased by 29% on raw coal’s LMWC basis by the treatment at 90°C in oxygen/formic acid. Surprisingly, the oxygen content of the coal decreased even in the presence of molecular oxygen when formic acid coexisted.
