Effect of air oxidation on coal hydrogenation

• Published in: Fuel (Guildford) Vol. 63; no. 1; pp. 35 - 38
• Main Authors: Ouchi, Koji, Maeda, Yozo, Itoh, Hironori, Makabe, Masataka
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 1984; Elsevier
• Subjects: Applied sciences; coal; Energy; Exact sciences and technology; Fuel processing. Carbochemistry and petrochemistry; Fuels; hydrogenation; preoxidation; Solid fuel processing (coal, coke, brown coal, peat, wood, etc.); preoxidation; coal; hydrogenation; Liquefaction; Carbochemistry; Japan; Coal; Influence; Oxidation; Pretreating; High temperature; Experimental study
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/0016-2361(84)90251-5

Japanese Taiheiyo coal (75.9%C) was oxidized with air at 250 °C for 3–40 h and at 300 °C for 3–10 h. The weight decreased from 16.3 to 46.5% at 250 °C and from 21.7 to 41.3% at 300 °C. Carbon loss and yield of NaOH soluble were obtained. The resultant oxidation products were hydrogenated at 370 °C for 1 h under 10 MPa hydrogen pressure using red mud with sulphur as catalyst and wash oil as solvent. Conversion to pyridine, benzene and n-hexane soluble fraction shows a minimum for the coal oxidized 10 h at 250 °C and for the coal oxidized for 3 h at 300 °C. Initial oxidation makes a network structure which contributes to a reduction in conversion, but in later stages of oxidation, splitting of bridge linkages and/or ring opening of aromatic structures, contribute to increases in conversion.