Abstract
The conversion and product fractionation obtained from supercritical benzene extraction of 5 Turkish lignite samples have been investigated. The lignite samples differ considerably in mode of occurrence and in their physical and chemical properties, thus the variation in the amount of humic acids found in different deposits. Humic substances were extracted from the lignite samples. Phenolic substances such as humic acid derivatives were characterized with a Gas Chromatography-Mass Spectrometry (GC-MS) combined system. To identify phenolic substances in the benzene extracts from the lignitesamples, a GC Hewlett-Packard 5790 and MS-VG 70-250-SE combined system was used. The column was a 25 m × 0.2 mm Inner Diameter (I.D.) with a film thickness of 0.25 μm Carbowax PEG 20 capillary glass.
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