Molecular mobility in coal-solvent multicomponent systems

The n.m.r. pulsed field gradient technique is applied to study molecular mobility in mixtures of coal with organic solvents. In this way it is possible to measure the self-diffusion coefficient of dissolved coal constituents, of residual water and of the solvent itself. It has been found that for su...

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Bibliographic Details
Published in:Fuel (Guildford) 1990-10, Vol.69 (10), p.1249-1252
Main Authors: Meusinger, Reinhard, Dennhardt, Frank, Kärger, Jörg, Meiler, Wolfgang, Pfeifer, Harry
Format: Article
Language:English
Subjects:
Applied sciences
brown coal
Energy
Exact sciences and technology
Fuel processing. Carbochemistry and petrochemistry
Fuels
mobile phase in coal
n.m.r
Solid fuel processing (coal, coke, brown coal, peat, wood, etc.)
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Summary:The n.m.r. pulsed field gradient technique is applied to study molecular mobility in mixtures of coal with organic solvents. In this way it is possible to measure the self-diffusion coefficient of dissolved coal constituents, of residual water and of the solvent itself. It has been found that for sufficiently large concentrations of the solvent and/or residual water (≈20 mass%) the mobility of these three components increases with both increasing humidity and solvent concentration, while for smaller concentrations in most cases a distinct minimum in molecular mobility is observed.
ISSN:0016-2361
1873-7153
DOI:10.1016/0016-2361(90)90285-X