Catalytic dissolution of two Turkish lignites in tetralin under nitrogen atmosphere: effects of the extraction parameters on the conversion

✍ Scribed by H. Karaca; K. Ceylan; A. Olcay

• Book ID: 104135613
• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 115 KB
• Volume: 80
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/s0016-2361(00)00119-8

✦ Synopsis

Two Turkish lignites were extracted with tetralin in a batch autoclave under nitrogen atmosphere. Fe 2 O 3 , Mo(CO) 6 , MoO 3 or Al 2 O 3 were used as the added catalyst. The isothermal extraction temperatures ranged from 325 to 425ЊC, the starting nitrogen pressure ranged from atmospheric to 5 MPa, the isothermal extraction periods ranged from 0 to 120 min. After removal of char and solvent, the remaining products were separated into three fractions: preasphaltenes (benzene insolubles), asphaltenes (benzene soluble, n-pentane insolubles) and oils (npentane solubles) by successive extractions with benzene and n-pentane. The variations in the conversions and soluble product compositions were investigated with respect to the extraction conditions. The results indicate that the conversions of the lignites are low below 350ЊC but high over 375ЊC. The catalysts enhance mainly the oil formation, and the catalytic activities of Mo(CO) 6 and Fe 2 O 3 are higher than the others. Lignite-impregnated catalysts show higher reactivity than the physically mixed catalysts. Increasing the extraction time and temperature affects the total conversion and soluble product composition. The gaseous product formation increases with the time at temperatures of 400ЊC and above.