Abstract
Air blowing of paving grade asphalt has been carried out to produce industrial grade asphalt. Chemical changes during air blowing of asphalt, in the presence of transition metal salts, have been evaluated by adsorption-desorption chromatography. The elemental composition and structural parameters based on ultraviolet (u.v.) and nuclear magnetic resonance (n.m.r.) spectra indicate that straight chain hydrocarbons are converted to naphthenes, which in turn are dehydrogenated to form aromatic hydrocarbons during air blowing. The blown product becomes more complex and condensed leading to an increase in molecular weight. These changes are accelerated by an active catalyst. A general transformation mechanism has been proposed.
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