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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
This is again consistent with the observations of isosteric heats as being close to heats of condensation. It is hypothesized that the retention of moisture in lignites involves a solvent swelling type of behavior, governed by the nature of different specific interaction sites within the lignites. The net enthalpy of interaction of liquid water with the coals is not large, whereas the interactions are comparable in strength to intermolecular interactions in bulk water, as suggested by the high temperatures needed to dry coals.
7 7,7,8,8-Tetracyanoquinodimethane (TCNQ), tetracyanoethylene (TCNE) and p-phenylenediamine, which are considered to have charge-transfer complex with coal molecules, increased the solubility. Aromatic compounds such as benzene, naphthalene and anthracene, and LiBr were also effective, although the effect was low, compared to TCNE and TCNQ. But, p-benzoquinone and chloranil were not effective, although both of them are a strong acceptor similar to TCNE and TCNQ. ~5 Figure 2 shows a plot of soluble wt% of PI fraction versus weight ratio of the additives to the PI fraction.
Org. Geochem. 1990, 76, 1067. 8. M. and Sundararaman, P. Org. Geochem. 1990, 75, 249. 9. K. M. Adv. in Org. Geochem. Pergamon Press, Oxford. 1979,229. 10. S. Adv. in Petroleum Geochem. 1984,7,115. Table 1. Analytical data of the Victorian brown coal sample and its hydrous pyrolysates at 200°C, 250° and 300°C. 1 Pentaaromatic 43 MONOMERS IN COAL MACROMOLECULES R. E. Winans, R. L. McBeth, J. E. Hunt, and P. E. Melnikov Chemistry Division, Argonne National Laboratory, Argonne, IL 60439 USA 1. INTRODUCTION The objective of this study is to elucidate the nature of the thermally stable monomers released from coal macromolecules upon heating.