Abstract
Asphaltene is an intermediate product in coal hydroliquefaction. The properties of asphaltene exert a considerable influence on the various aspects of the primary coal hydroliquefaction products and on the reactivity of the primary product in further processing. In Part I the definition of asphaltene and methods for its separation were reviewed. In Part II the chemical structure of asphaltenes derived from various coals are reviewed from the results of ultimate analysis, infrared spectroscopy, nuclear magnetic resonance spectroscopy, vapor pressure osmometry, gel permeation chromatography and mass spectroscopy. In the final part, the reactivity of asphaltene will be reviewed.
