By Yong Zhou
1991 overseas convention on Coal technological know-how lawsuits
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Additional resources for 1991 International Conference on Coal Science Proceedings. Proceedings of the International Conference on Coal Science, 16–20 September 1991, University of Newcastle-Upon-Tyne, United Kingdom
No evidence of multistep drying kinetics were seen in these experiments, which only followed moisture loss to 85% of original levels. The drying rates are much higher than those reported for a similar Beulah-Zap sample in one study , and much lower than those reported in another . The origin of the discrepancy is unclear, except that in ref. 14, the rate was not modeled as first order in remaining moisture. The value of activation energies are quite variable, and their interpretation is uncertain to say the least.
6]) that the onset of softening is a fusion transition or physical déstabilisation - the temperature of its occurrence being a measure of the strength of the non-covalent or physical stabilisation of the coal molecular lattice. The extent of déstabilisation of the coal molecular lattice by heat or exposure to solvent can be assessed by proton nuclear magnetic resonance (*H NMR) techniques which allow changes in the molecular dynamics to be detected and quantified. g. ). lino and Matsuda  have shown that the room temperature extractability of bituminous coals is much greater when this solvent, 32 which is expected to be effective in destabilising electrostatic interactions, is used in binary mixtures with carbon disulphide (CS2).
15] that the moisture loss from coal increases with drying temperature, even above 373 K. This supports the idea that there is a distribution of energies associated with water retention and that some water is held more strongly in coal than in pure bulk water. Just how much more strongly is revealed by other types of experiments. Sorption isotherms were measured as earlier described  for the lignites of Table 1 and results are given in Fig. 2. e. 7 kJ/mol). Even when there is a shift between 303 K and 323 K the results imply isosteric heats of order 70 kJ/mol or less.
1991 International Conference on Coal Science Proceedings. Proceedings of the International Conference on Coal Science, 16–20 September 1991, University of Newcastle-Upon-Tyne, United Kingdom by Yong Zhou