Effects of model-solvent/vehicle-oil ratio on liquefaction yields of Alaskan subbituminous coal

• Published in: Fuel (Guildford) Vol. 73; no. 1; pp. 99 - 104
• Main Authors: Yoon, Wang L., Lee, Ho T., Lee, In C., Chung, Jin D.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 1994; Elsevier
• Subjects: Applied sciences; Energy; Exact sciences and technology; Fuel processing. Carbochemistry and petrochemistry; Fuels; liquefaction; model solvent; Solid fuel processing (coal, coke, brown coal, peat, wood, etc.); subbituminous coal; Alaska; United States; North America; America; subbituminous coal; liquefaction; model solvent; Phenanthrene derivatives; Naphthalene; Liquefaction; Naphthalene(1,2,3,4-tetrahydro); Coal; Subbituminous coal; Yield; Solvent
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/0016-2361(94)90194-5

The effect of the model solvent to V-1072 heavy hydrotreated recycle distillate ratio on the liquefaction of Alaskan subbituminous coal was investigated. Model solvents used were tetralin, 9,10-dihydrophenanthrene, naphthalene and phenanthrene. The first two (hydroaromatic) solvents gave similar trends: nearly constant preasphaltene yield, a steady decrease in asphaltene yield and a monotonic increase in oil yield with increasing solvent concentration. The main difference between these two solvents was that coal conversion varied little with tetralin concentration but slightly increased with increasing 9,10-DHP concentration. The two aromatic solvents, naphthalene and phenanthrene, gave very similar trends in liquefaction product distribution. Asphaltene, preasphaltene and coal conversion showed monotonic decreases, but the oil yield increased with solvent concentration. With added hydrogen donor (tetralin, dihydrophenanthrene), both coal conversion and oil yield increased with reaction time. With added hydrogen shuttler (naphthalene, phenanthrene), the transfer of hydrogen from coal to itself was enhanced, leading to higher yields of oil and pyridine-insolubles.