Abstract
A high-vitrinite coking coal (87%C,daf) is subjected both to reductive butylation by treatment with potassium and butyl iodide in tetrahydrofuran and to non-reductive butylation by treatment with butyl lithium and butyl iodide. The yields of chloroform extracts (butylated coal basis) are 67.2 and 17.1% respectively. The extracts are separated by adsorption and gel-permeation chromatography into a few fractions in a way to be in “equimolar” ratios (considering the average molecular masses). A specific method for modelling the average structure of butylated coal products is used based on elemental and average molecular mass analysis and data derived from 1H and 13C NMR spectra. The constructed fraction models are corrected with respect to the introduced butyl groups and pieced together in an assembled model of the initial coal structure. The designed model visualizes some coking coal structural features.
Published Version
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