Abstract
High molecular-mass basic fractions considerably enriched in nitrogen compounds are obtained from coal-derived asphaltenes and pre-asphaltenes by means of a new acid/base fractionation procedure using acid-modified silica. Ultimate analysis, F.T.-i.r., and gas- and size-exclusion chromatography were used to characterise the basic fractions, and to show that the new method affords considerable advantages over adduction with gaseous hydrogen chloride.
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