Effects of tetrabutylammonium acetate addition on the aggregation of coal molecules at solution and solid states

H. Shui, Koyo Norinaga, M. Iino

Research output: Contribution to journalArticle

21 Citations (Scopus)


Effect of tetrabutylammonium acetate (TBAA) addition on the aggregation of coal-derived materials at solution and solid states was investigated. As coal-derived materials, a 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. Similar results were obtained when CS2/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.

Original languageEnglish
Pages (from-to)487-491
Number of pages5
JournalEnergy and Fuels
Issue number2
Publication statusPublished - Mar 1 2001


All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology

Cite this