Abstract
SUMMARY A synciude obtained by direct liquefaction of a Spanish subbituminous coal was deasphalted as a previous step of upgrading lo get a better feedstock for further processing. Deasphalting was carried out by ultrasonic extraction with n-hexane. Raw and deasphalted coal syncmdes have been fractionated into six fractions by an extrographic procedure that utilizes six eluents of increasing polarity. Each fraction has been analyzed by FTIR, gas chromatography. GC-MS and high resolution mass spectrometry. Deasphalting removed 36 % of nitrogen, 44 % of sulphur and 47 % of oxygen. Nevertheless, the deasphalted liquids would require further removal of hetenatoms by hydroprocessing. Polynuclear aromatic compounds appeared in all extrografic fractions. Nimgen-containing compounds have been found in the fractions In, IV and V, when polar solvents have been used. Some mixed heterocyclic compounds (N-0, N-S) have been observed in the most polar fractions (V and VI).
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