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Abstract
A Separation method that combines extrography (EX) and sequential elution solvent chromatography (SESC), called SESC-EX, was used for the characterization of products derived from hydroliquefaction of a French coal and of pitches obtained from coal and petroleum tars. The selected examples show the efficiency of this technique for the evaluation of the effects of reaction temperature on the hydroliquefaction products and the characterization of pitches according to their origins (low (LT) and high (HT) temperature pitches). Further data on the chemical structure of pitches were obtained by chromatographic and spectroscopic analyses. All these methods showed marked differences between LT and HT pitches.
Published Version
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