The influence of impregnation by hydrocarbons on coal structure during its thermal evolution

The present work analyses the changes in the chemical structure of a perhydrous coal during its thermal evolution at different temperatures in an open-medium pyrolysis system. The results obtained were compared with those described for non-perhydrous coals in order to establish the effect of the sub...

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Autores: Iglesias, María José, Cuesta, María José, Laggoun-Défarge, Fatima, Suárez Ruiz, Isabel
Tipo de recurso: artículo
Fecha de publicación:2001
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/2605
Acceso en línea:http://hdl.handle.net/10261/2605
Access Level:acceso abierto
Palabra clave:Coal
Chemical structure
Physical structure
Coal structure
Perhydrous vitrinite
Thermal evolution
Pyrolysis
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spelling The influence of impregnation by hydrocarbons on coal structure during its thermal evolutionIglesias, María JoséCuesta, María JoséLaggoun-Défarge, FatimaSuárez Ruiz, IsabelCoalChemical structurePhysical structureCoal structurePerhydrous vitriniteThermal evolutionPyrolysisThe present work analyses the changes in the chemical structure of a perhydrous coal during its thermal evolution at different temperatures in an open-medium pyrolysis system. The results obtained were compared with those described for non-perhydrous coals in order to establish the effect of the substances assimilated by the coal structure (hydrocarbon/oil-like substances) on the thermal evolution of the coal. The transformation ratio at each stage of thermal treatment was determined and the chemical-structural characterisation of the resultant products was performed. Changes in textural and microtextural properties associated with structural modifications during the evolution were also tested. The results obtained show that this perhydrous coal develops a specific evolution pathway different from that followed by non-perhydrous coals with a normal H/C ratio. The substances assimilated by the perhydrous coal cannot be easily and totally released from its structure so that they can be only partially removed after thermal treatment. Thus, the treatment debilitates the interactions between the substances and the coal matrix in addition to weakening and cracking the matrix during the thermal process. The increase in temperature also leads to the conversion of some of the heavy assimilated substances into lighter compounds. However, the assimilated substances are present even at high temperatures of the thermal process, providing hydrogen which has the effect of stabilising the radicals originated during the pyrolysis and improving the fluidity properties in the reacting medium.Financial support for this work was provided through a contract with the European Community (No. 7220/EC-769).Peer reviewedElsevier200720072001info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501485442 bytesapplication/pdfhttp://hdl.handle.net/10261/2605reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1016/S0165-2370(00)00181-9info:eu-repo/semantics/openAccessoai:digital.csic.es:10261/26052026-05-22T06:33:51Z
dc.title.none.fl_str_mv The influence of impregnation by hydrocarbons on coal structure during its thermal evolution
title The influence of impregnation by hydrocarbons on coal structure during its thermal evolution
spellingShingle The influence of impregnation by hydrocarbons on coal structure during its thermal evolution
Iglesias, María José
Coal
Chemical structure
Physical structure
Coal structure
Perhydrous vitrinite
Thermal evolution
Pyrolysis
title_short The influence of impregnation by hydrocarbons on coal structure during its thermal evolution
title_full The influence of impregnation by hydrocarbons on coal structure during its thermal evolution
title_fullStr The influence of impregnation by hydrocarbons on coal structure during its thermal evolution
title_full_unstemmed The influence of impregnation by hydrocarbons on coal structure during its thermal evolution
title_sort The influence of impregnation by hydrocarbons on coal structure during its thermal evolution
dc.creator.none.fl_str_mv Iglesias, María José
Cuesta, María José
Laggoun-Défarge, Fatima
Suárez Ruiz, Isabel
author Iglesias, María José
author_facet Iglesias, María José
Cuesta, María José
Laggoun-Défarge, Fatima
Suárez Ruiz, Isabel
author_role author
author2 Cuesta, María José
Laggoun-Défarge, Fatima
Suárez Ruiz, Isabel
author2_role author
author
author
dc.subject.none.fl_str_mv Coal
Chemical structure
Physical structure
Coal structure
Perhydrous vitrinite
Thermal evolution
Pyrolysis
topic Coal
Chemical structure
Physical structure
Coal structure
Perhydrous vitrinite
Thermal evolution
Pyrolysis
description The present work analyses the changes in the chemical structure of a perhydrous coal during its thermal evolution at different temperatures in an open-medium pyrolysis system. The results obtained were compared with those described for non-perhydrous coals in order to establish the effect of the substances assimilated by the coal structure (hydrocarbon/oil-like substances) on the thermal evolution of the coal. The transformation ratio at each stage of thermal treatment was determined and the chemical-structural characterisation of the resultant products was performed. Changes in textural and microtextural properties associated with structural modifications during the evolution were also tested. The results obtained show that this perhydrous coal develops a specific evolution pathway different from that followed by non-perhydrous coals with a normal H/C ratio. The substances assimilated by the perhydrous coal cannot be easily and totally released from its structure so that they can be only partially removed after thermal treatment. Thus, the treatment debilitates the interactions between the substances and the coal matrix in addition to weakening and cracking the matrix during the thermal process. The increase in temperature also leads to the conversion of some of the heavy assimilated substances into lighter compounds. However, the assimilated substances are present even at high temperatures of the thermal process, providing hydrogen which has the effect of stabilising the radicals originated during the pyrolysis and improving the fluidity properties in the reacting medium.
publishDate 2001
dc.date.none.fl_str_mv 2001
2007
2007
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/2605
url http://hdl.handle.net/10261/2605
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1016/S0165-2370(00)00181-9
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 485442 bytes
application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
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