HYDROGEN-TRANSFER FROM TETRALIN TO COALS - REACTIVITY OF BITUMINOUS COALS AND THEIR PRODUCTS OF EXTRACTION WITH N-METHYL-2-PYRROLIDINONE

To explain certain phenomena occurring during thermal processing of co al, studies were made of hydrogen transfer to coals, their N-methyl-2- pyrrolidinone (NMP) extracts and residues, and tetrahydrofuran (THF)-s oluble and -insoluble parts of the NMP extracts. The transfer of hydro gen to coals was found to be rank-dependent; the extraction products f ollowed the same trend but with a poorer correlation. Much higher hydr ogen acceptance reactivities were determined for NMP residues than for parent coals. The reactivity of extracts changed during prolonged sto rage. The FT-i.r. deconvoluted spectra, the correlation between oxygen content and hydrogen transfer and other data indicated that carbonyl (quinone) groups are the primary acceptor sites of hydrogen from tetra lin at relatively low temperature (310-320-degrees-C). The relation be tween hydrogen acceptance and coke microtexture formation during carbo nization is discussed.