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Title: Desulfurization of organic sulfur from a subbituminous coal by electron-transfer process with K{sub 4}(Fe(CN){sub 6})

Abstract

The desulfurization reaction involving direct electron transfer from potassium ferrocyanide, K{sub 4}(Fe(CN){sub 6}), successfully removed organic sulfur from a subbituminous coal. The temperature variation of desulfurization revealed that increase of temperature enhanced the level of sulfur removal. Moreover, the desulfurization reaction was found to be dependent on the concentration of K{sub 4}(Fe(CN){sub 6}). Gradual increase in the concentration of K{sub 4}(Fe(CN){sub 6}) raised the magnitude of desulfurization, but at higher concentration the variation was not significant. The removal of organic sulfur from unoxidized coal slightly increased with reduced particle size. Desulfurization from oxidized coals (prepared by aerial oxidation) revealed a higher level of sulfur removal in comparison to unoxidized coal. Highest desulfurization of 36.4 wt % was obtained at 90{sup o}C and 0.1 M concentration of K{sub 4}(Fe(CN){sub 6}) in the 100-mesh size oxidized coal prepared at 200{sup o}C. Model sulfur compound study revealed that aliphatic types of sulfur compounds are primarily responsible for desulfurization. Because of higher stability, thiophene and condensed thiophene-type of compounds perhaps remained unaffected by the electron-transfer agent. Infrared study revealed the formation of oxidized sulfur compounds (sulfoxide, sulfone, sulfonic acid, etc.) in the oxidized coals. The desulfurization reaction in different systems is well-represented by themore » pseudo-first-order kinetic model. Application of the transition state theory indicated that the desulfurization reaction proceeds with the absorption of heat (endothermic reaction) and is nonspontaneous in nature. 53 refs., 6 figs., 3 tabs.« less

Authors:
 [1]
  1. Pragjyotika J College, Titabar (India). Department of Chemistry
Publication Date:
OSTI Identifier:
20701160
Resource Type:
Journal Article
Resource Relation:
Journal Name: Energy and Fuels; Journal Volume: 20; Journal Issue: 1; Other Information: diputtb@yahoo.co.in
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; SUBBITUMINOUS COAL; DESULFURIZATION; ORGANIC SULFUR COMPOUNDS; FERROCYANIDES; POTASSIUM COMPOUNDS; TEMPERATURE DEPENDENCE; CONCENTRATION RATIO; OXIDATION; ELECTRON TRANSFER; CHEMICAL REACTION KINETICS

Citation Formats

Dipu Borah. Desulfurization of organic sulfur from a subbituminous coal by electron-transfer process with K{sub 4}(Fe(CN){sub 6}). United States: N. p., 2006. Web. doi:10.1021/ef050340b.
Dipu Borah. Desulfurization of organic sulfur from a subbituminous coal by electron-transfer process with K{sub 4}(Fe(CN){sub 6}). United States. doi:10.1021/ef050340b.
Dipu Borah. Wed . "Desulfurization of organic sulfur from a subbituminous coal by electron-transfer process with K{sub 4}(Fe(CN){sub 6})". United States. doi:10.1021/ef050340b.
@article{osti_20701160,
title = {Desulfurization of organic sulfur from a subbituminous coal by electron-transfer process with K{sub 4}(Fe(CN){sub 6})},
author = {Dipu Borah},
abstractNote = {The desulfurization reaction involving direct electron transfer from potassium ferrocyanide, K{sub 4}(Fe(CN){sub 6}), successfully removed organic sulfur from a subbituminous coal. The temperature variation of desulfurization revealed that increase of temperature enhanced the level of sulfur removal. Moreover, the desulfurization reaction was found to be dependent on the concentration of K{sub 4}(Fe(CN){sub 6}). Gradual increase in the concentration of K{sub 4}(Fe(CN){sub 6}) raised the magnitude of desulfurization, but at higher concentration the variation was not significant. The removal of organic sulfur from unoxidized coal slightly increased with reduced particle size. Desulfurization from oxidized coals (prepared by aerial oxidation) revealed a higher level of sulfur removal in comparison to unoxidized coal. Highest desulfurization of 36.4 wt % was obtained at 90{sup o}C and 0.1 M concentration of K{sub 4}(Fe(CN){sub 6}) in the 100-mesh size oxidized coal prepared at 200{sup o}C. Model sulfur compound study revealed that aliphatic types of sulfur compounds are primarily responsible for desulfurization. Because of higher stability, thiophene and condensed thiophene-type of compounds perhaps remained unaffected by the electron-transfer agent. Infrared study revealed the formation of oxidized sulfur compounds (sulfoxide, sulfone, sulfonic acid, etc.) in the oxidized coals. The desulfurization reaction in different systems is well-represented by the pseudo-first-order kinetic model. Application of the transition state theory indicated that the desulfurization reaction proceeds with the absorption of heat (endothermic reaction) and is nonspontaneous in nature. 53 refs., 6 figs., 3 tabs.},
doi = {10.1021/ef050340b},
journal = {Energy and Fuels},
number = 1,
volume = 20,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2006},
month = {Wed Feb 01 00:00:00 EST 2006}
}