Indonesian low rank coal oxidation: The effect of H2O2 concentration and oxidation temperature

2nd International Conference on Chemical Engineering (ICCE) UNPAR

Rahayu, S.S.^1 ; Findiati, F.^1 ; Aprilia, F.^1

Chemical Engineering Department, Universitas Gadjah Mada, Indonesia^1

关键词: Alkaline solutions;    Coal oxidation;    Extraction process;    Humic substances;    Low rank coals;    Oxidation temperature;    Reaction temperature;    Residence time;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/162/1/012025/pdf
DOI  :  10.1088/1757-899X/162/1/012025

来源: IOP

【 摘 要 】

Extraction of Indonesian low rank coals by alkaline solution has been performed to isolate the humic substances. Pretreatments of the coals by oxidation using H2O2prior to extraction are required to have higher yield of humic substances. In the previous research, only the extraction process was considered. Therefore, the effects of reaction temperature and residence time on coal oxidation and composition of extract residues are also investigated in this research. The oxidation temperatures studied were 40°C, 50°C, and 70°C and the H2O2concentrations studied were 5%, 15%, 20 %, and 30 %. All the oxidation variables were studied for 90 minutes. The results show that the higher the concentration of H2O2used, the less oxidized coal produced. The same trend was obtained by using higher oxidation temperature. The effect of H2O2concentration, oxidation temperature and reaction time to the yield of humic substances extraction have positive trends.