Determination of the effect of different additives in coking blends using a combination of in situ high-temperature 1H NMR and rheometry

Castro Diaz, Miguel C., Steel, Karen M., Drage, Trevor C., Patrick, John W. and Snape, Colin E. (2005) Determination of the effect of different additives in coking blends using a combination of in situ high-temperature 1H NMR and rheometry. Energy & Fuels, 19 6: 2423-2431. doi:10.1021/ef050126n


Author Castro Diaz, Miguel C.
Steel, Karen M.
Drage, Trevor C.
Patrick, John W.
Snape, Colin E.
Title Determination of the effect of different additives in coking blends using a combination of in situ high-temperature 1H NMR and rheometry
Journal name Energy & Fuels   Check publisher's open access policy
ISSN 0887-0624
Publication date 2005-11-01
Year available 2005
Sub-type Article (original research)
DOI 10.1021/ef050126n
Open Access Status
Volume 19
Issue 6
Start page 2423
End page 2431
Total pages 9
Place of publication WASHINGTON
Publisher American Chemical Society
Language eng
Subject 0904 Chemical Engineering
Abstract High-temperature H-1 NMR and rheometry measurements were carried out on 4:1 wt/wt blends of a medium volatile bituminous coal with two anthracites, two petroleum cokes, charcoal, wood, a low-temperature coke breeze, tyre crumb, and active carbon to determine the effects on fluidity development to identify the parameters responsible for these effects during pyrolysis and to study possible relationships among the parameters derived from these techniques. Positive, negative, and neutral effects were identified on the concentration of fluid material. Small positive effects (ca. 5-6%) were caused by blending the coal with petroleum cokes. Charcoal, wood, and active carbon all exerted negative effects on concentration (18-27% reduction) and mobility (12-25% reduction in T-2) of the fluid phase, which have been associated with the inert character and high surface areas of these additives that adsorb the fluid phase of the coal. One of the anthracites and the low-temperature coke breeze caused deleterious effects to a lesser extent on the concentration (7-12%) and mobility (13-17%) of the fluid material, possibly due to the high concentration of metals in these additives (ca. 11% ash). Despite the high fluid character of tyre crumb at the temperature of maximum fluidity of the coal (73%), the mobility of the fluid phase of the blend was lower than expected. The comparison of H-1 NMR and rheometry results indicated that to account for the variations in minimum complex viscosity (eta(*)) for all the blends, both the maximum concentration of fluid phase and the maximum mobility of the fluid material (T-2L) had to be considered. For individual blends, two exponential relationships have been found between the complex viscosity and the concentration of solid phase in both the softening and resolidification stages but the parameters are different for each blend.
Keyword Crystal mesophas development
Coal-tar Pitch
Metallurgical cokes
Softening coal
Petroleum coke
liquid content
Carbonization
Generation
Plasticity
viscosity
Q-Index Code C1
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Chemical Engineering Publications
 
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