Solvent treatment of coals: 1. Effects on microporosity at ambient temperature

✍ Scribed by Myrna P. Klotzkin

• Publisher: Elsevier Science
• Year: 1985
• Tongue: English
• Weight: 652 KB
• Volume: 64
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(85)90112-7

✦ Synopsis

The effects of extraction with thirteen solvents and three solvent mixtures at ambient temperature on the surface areas of three bituminous coals were investigated. The total surface area of each coal, measured by CO, at 298 K, was substantially increased by extraction with pyridine, ethylenediamine, methylpyrrolidinone and THF. The maximum surface area attained was nearly the same for the three coals--evidence for a similar, highly crosslinked macromolecular network type of structure in all three coals. Given enough time, the mixed solvents were also effective in increasing the total surface area when the 'solubility parameter' of the coal was equal to the 'solubility parameter' of the mixture. None of the solvents increased the surface area measured by nitrogen significantly, indicating that the pores opened by the extraction of soluble pore material were < 0.5 nm in size. All the effective solvents satisfied the donor and acceptor number requirements for extraction of pore material based on the donor-acceptor model of coal extraction.