Chemical reactivity of coal under Friedel-Crafts reaction conditions: Effect of nature of solvent, alkylating agent and catalyst on extractability of coal through a complex series reaction (ATD3 reaction)
Coal is a complex macromolecule of predominantly aromatic character. The reaction of coal under
Friedel-Crafts conditions is not a simple alkylation but involves a series of complex reactions. The molecular dynamics of coal molecules under such conditions can be studied by FT-i.r. spectrometry, elemental analysis,
swelling and extraction. Several alkylating agents such as alkenes, alcohols, alkyl halides, phenol and alkane were used in solvents such as CS2, pyridine, quinoline, nitrobenzene, liquid paraffin, anthracene oil and tetralin in catalysed and uncatalysed reactions. The mineral matter in coal was found to catalyse these
reactions. Extraction enhancement was used as a measure ofthe effectiveness ofreactions such as degradation, disintegration and transalkylation of coals. The reaction of coal with alkylating agents under Friedel-Crafts conditions was found to be a series reaction:alkylation-transalkylation-dehydrogenation-degradation-
dissociation (ATD3 reaction).