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Study on dielectric properties of high organic sulfur coking coal and modeling sulfur compounds

Coking coal is geologically scarce resource and most of them cannot be directly used in steel making due to their higher sulfur content. One desulfurization method that has great potential for massive application is microwave desulfurization, which removes the relatively stubborn organic sulfur unde...

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Autores principales: Cai, Chuanchuan, Ge, Tao, Zhang, Mingxu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6317830/
https://www.ncbi.nlm.nih.gov/pubmed/30605468
http://dx.doi.org/10.1371/journal.pone.0208125
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author Cai, Chuanchuan
Ge, Tao
Zhang, Mingxu
author_facet Cai, Chuanchuan
Ge, Tao
Zhang, Mingxu
author_sort Cai, Chuanchuan
collection PubMed
description Coking coal is geologically scarce resource and most of them cannot be directly used in steel making due to their higher sulfur content. One desulfurization method that has great potential for massive application is microwave desulfurization, which removes the relatively stubborn organic sulfur under mild conditions. The dielectric properties of coals determine the efficiency of the microwave energy absorption. The key to describing the mechanism of microwave desulfurization and further improvement of the desulfurization efficiency is the dielectric response of organic sulfur compounds in coal to microwave. This study focuses on existing formand microwave response of organic sulfur components of three typical coking coal in China. Resultsshowed that the major organic sulfur in selected coals is thiophene which has a stable structure and is the most difficult to be removed. Several dielectric peaks (dielectric loss)andsignificant differencesofeach selected coal samples are observed. The microwave absorption peaks of the model sulfur compounds are identified to be within 9-11GHz. The real parts of the relative dielectric constants (hereinafter referred to as ε′) shows a decreasing trend as: diphenyl sulfoxide > diphenyl sulfone > diphenyl sulfide > dibenzothiophene > Octadecane thiol. Response to microwaveare observed to be distinctively different between sulfur-containing and sulfur-free model compounds. The dielectric polarization of mixture (coal mixed with model sulfur compounds) is greater than pure coal. Meanwhile the higher the sulfur content of the coal, the greater the ε′ is. Sulfur componentsin coal can significantly influence its polarization.
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spelling pubmed-63178302019-01-19 Study on dielectric properties of high organic sulfur coking coal and modeling sulfur compounds Cai, Chuanchuan Ge, Tao Zhang, Mingxu PLoS One Research Article Coking coal is geologically scarce resource and most of them cannot be directly used in steel making due to their higher sulfur content. One desulfurization method that has great potential for massive application is microwave desulfurization, which removes the relatively stubborn organic sulfur under mild conditions. The dielectric properties of coals determine the efficiency of the microwave energy absorption. The key to describing the mechanism of microwave desulfurization and further improvement of the desulfurization efficiency is the dielectric response of organic sulfur compounds in coal to microwave. This study focuses on existing formand microwave response of organic sulfur components of three typical coking coal in China. Resultsshowed that the major organic sulfur in selected coals is thiophene which has a stable structure and is the most difficult to be removed. Several dielectric peaks (dielectric loss)andsignificant differencesofeach selected coal samples are observed. The microwave absorption peaks of the model sulfur compounds are identified to be within 9-11GHz. The real parts of the relative dielectric constants (hereinafter referred to as ε′) shows a decreasing trend as: diphenyl sulfoxide > diphenyl sulfone > diphenyl sulfide > dibenzothiophene > Octadecane thiol. Response to microwaveare observed to be distinctively different between sulfur-containing and sulfur-free model compounds. The dielectric polarization of mixture (coal mixed with model sulfur compounds) is greater than pure coal. Meanwhile the higher the sulfur content of the coal, the greater the ε′ is. Sulfur componentsin coal can significantly influence its polarization. Public Library of Science 2019-01-03 /pmc/articles/PMC6317830/ /pubmed/30605468 http://dx.doi.org/10.1371/journal.pone.0208125 Text en © 2019 Cai et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Cai, Chuanchuan
Ge, Tao
Zhang, Mingxu
Study on dielectric properties of high organic sulfur coking coal and modeling sulfur compounds
title Study on dielectric properties of high organic sulfur coking coal and modeling sulfur compounds
title_full Study on dielectric properties of high organic sulfur coking coal and modeling sulfur compounds
title_fullStr Study on dielectric properties of high organic sulfur coking coal and modeling sulfur compounds
title_full_unstemmed Study on dielectric properties of high organic sulfur coking coal and modeling sulfur compounds
title_short Study on dielectric properties of high organic sulfur coking coal and modeling sulfur compounds
title_sort study on dielectric properties of high organic sulfur coking coal and modeling sulfur compounds
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6317830/
https://www.ncbi.nlm.nih.gov/pubmed/30605468
http://dx.doi.org/10.1371/journal.pone.0208125
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