Abstract
Publisher Summary This chapter describes the effect of various additives on noncovalent interactions in coals. In a study described in the chapter, some extract fractions and various compounds were added to the pyridine insoluble (PI) fraction, and its solubility was examined in the CS 2 –NMP mixed solvent. The solubility was determined from the amount of the insoluble when 0.40 g of the PI fraction of Shin-Yubari, Zao Zhuang, and Upper Freeport coal was dissolved in 50 ml of the CS 2 –NMP mixed solvent (1:1 by volume) at room temperature, under ultrasonic irradiation for 30 min. It was found that CS 2 –NMP extract or its acetone insoluble (AI) fraction was almost soluble in the mixed solvent for redissolution. But, after fractionation by pyridine, 30–50 wt% of PI fraction, which is heavier than preasphaltene, became insoluble in the mixed solvent. Separated lighter fractions, that is, AS and/or pyridine soluble (PS) fractions were added to the PI fraction in the mixed solvent, resulting in the enhanced solubility of the PI fraction in the mixed solvent.
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