Abstract
The effect of u.v. radiation on the product distribution of the acid-catalysed depolymerization reaction of a lignite (C, 66.9wt%) has been investigated. The products are separated by solvent extraction and silica gel chromatography and their 1H n.m.r. spectra and molecular weights are also measured. Larger amounts of solubilized material are formed in the u.v.-irradiated depolymerization experiments due to a greater amount of phenol incorporation in the reactions. The relative molar masses of products are lower than those obtained from thermal depolymerization experiments and they contain less hydroaromatic structures connected by fewer methylene bridges. It is suggested that u.v. radiation is making the coal more accessible for phenol in the depolymerization reactions.
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