Abstract
The possibility of O-methylation occurring during the treatment of low rank coals with methanol/sodium hydroxide is evaluated. Chemical and spectral data of malthene fractions confirm unequivocally the presence of methoxyl groups. Their content was found to correlate with the efficiency of treatment. Formation of methyl esters after saponification of ester bridges in lignites is also probable. Reactions of O-alkylation contribute to stabilization through methylation of reactive intermediate species formed after cleavage of ether or ester linkages in coal organic matter, thus improving solubilization.
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