Enhanced extractability in coal liquefaction by alkali metal-liquid ammonia pretreatment

Pretreatment of two bituminous coals with alkali metal in liquid ammonia followed by protonation with NH 4Cl resulted in an improvement of the conversion in thermal coal liquefaction. Experiments were performed at 400 and 425 °C, without catalyst in n-dodecane (inert) as well as in tetralin (H-donat...

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Bibliographic Details
Published in:Fuel (Guildford) 1988, Vol.67 (1), p.80-85
Main Authors: de Vlieger, Jan J., Kieboom, Antonius P.G., Bekkum, Herman van
Format: Article
Language:English
Subjects:
Applied sciences
coal liquefaction
Exact sciences and technology
extraction
liquefaction of coal
Other techniques and industries
pretreatment
process control
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Summary:Pretreatment of two bituminous coals with alkali metal in liquid ammonia followed by protonation with NH 4Cl resulted in an improvement of the conversion in thermal coal liquefaction. Experiments were performed at 400 and 425 °C, without catalyst in n-dodecane (inert) as well as in tetralin (H-donating) as the solvent. Coal liquefaction products that were soluble in tetrahydrofuran were analysed by g.p.c., 13C and 1H n.m.r. The material extracted with n-dodecane without pretreatment of the coal is highly aromatic, but metal-ammonia pretreatment decreases both the 13C- and 1H-aromaticity. A mechanism for the increase in conversion in relation to coal structure is discussed.
ISSN:0016-2361
1873-7153
DOI:10.1016/0016-2361(88)90016-6