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Asphaltenes, the key intermediates in the liquefaction of bituminous coals, consist of hydrogen bonded complexes which can be separated into their acidic and basic components. The acidic components contain all, while the basic components contain none, of the exchangeable protons present. The significance of these findings with respect to coal structure and coal solubilization is discussed.

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high recovery was traced to the filter paper. Ethylene glycolfree water after passage through the filter paper gave intensely brilliant blue solutions on analysis and the intensity decreased with prolonged passage of wash water. The spectra in Figure