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Coking properties of perhydrous low-rank vitrains. Influence of pyrolysis conditions by Fatima Laggoun-Défarge; Jean-Noël Rouzaud; M.José Iglesias; Isabel Suarez-Ruiz; Nicolas Buillit; Jean-Robert Disnar is a Engineering article available to read on EtoBox.

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Compositional transformations occurring during natural coalification generally lead to increased coking potential of coals characterised in the resulting cokes by large sizes of molecular orientation domains (MOD) determined through transmission electron microscopy with 002 dark field mode. In this study, two sets of perhydrous low-rank vitrains (WJV and UCV) have been pyrolysed using an open-system with two heating rates in an attempt to increase their coking potential. Results show that, despite the high potentialities of such vitrains for producing hydrocarbons, i.e. a suspensive medium efficient for their cokefaction, each of the pyrolysis methods does not lead to solid residues chemically equivalent to natural coking coals, since the cokes from these residues are always made of smaller MOD than those obtained for coking coals. For comparison, a similar characterisation, carried out on a conventional vitrain (Fouthiaux) pyrolysed in a confined-system which prevents the release of hydrocarbons, leads also to non-coking coals. The formation of such MOD is likely due to the peculiar chemical composition of the precursors and/or the pyrolysis conditions. FTIR data show that perhydr

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Author

Fatima Laggoun-Défarge; Jean-Noël Rouzaud; M.José Iglesias; Isabel Suarez-Ruiz; Nicolas Buillit; Jean-Robert Disnar

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0165-2370)

Published

2003

Language

EN

Field

Engineering (Physical Sciences)