ASSOCIATION BEHAVIOR OF COAL EXTRACTS IN SOLUTION AND THE EFFECT OF SOME ADDITIVES ON IT

摘要

Effect of tetrabutylammonium acetate (TBAA) addition on the aggregation of coal derived materials at solution and solid states was investigated. As coal derived materials, pyridine insoluble fraction (PI) of the extract of Upper Freeport coal was used. Two kinds of the solid states with quite different solubility in N-methyl-2-pyrrolidinone (NMP) were obtained for PI by the removal of the solvents from its solution in NMP with and without TBAA, respectively. The similar results were obtained when CS_2/NMP mixed solvent was used instead of NMP. Characterizations of these two types of PI by FT-IR, elementary and XRD analysis suggest that they have different states of molecular aggregation, which seem to be the reflection of their aggregation states in solution.