Abstract
Transalkylation reactions of a non-coking coal, Taiheiyo coal, using alkyl acceptors, 9,10-dihydroanthracene (DHA) or naphthalene, have been carried out in the presence of super acid catalyst of trifluoromethane sulphonic acid. The carbonization behaviour of transalkylated Taiheiyo coal was studied with respect to mesophase formation. The development of optical texture in coke was affected strongly by the nature and quantity of alkyl acceptor introduced into the coal molecule. The variation in spin concentration of transalkylated coal during the carbonization reaction was monitored using high-temperature e.s.r. The improvement of the carbonization property of transalkylated coal was discussed in terms of the stabilization of radicals. A schematic model of the carbonization reaction of transalkylated coal is proposed on the basis of these observations.
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