Aspects of the chemistry of donor solvent coal dissolution. The role of phenol in the reaction

✍ Scribed by Hsiang-Hui King; Leon M. Stock

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 364 KB
• Volume: 61
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(82)90210-1

✦ Synopsis

multiple washings with benzene. Evidently, supercritical CO, is more effective at penetrating the interior of the solid coal-extract, at displacing the pyridine, or both. The selective removal of pyridine from the solid extract is analogous to the selective extraction of alkaloids from plant material with supercritical CO,.6

EXPERIMENTAL

Supercritical carbon dioxide extraction

Pyridine extract (Z 1 g) was placed in a 15 x 0.4 cm stainless steel column containing 5 ,um frits on either end and 300 ~1 of water was added to the extract. This was maintained at 40°C (the critical temperature of CO, is 31.3"C) and carbon dioxide (10.2 MPa) was passed through the column for 4 h at an exit flow rate of 1 ml s-' (at atmospheric pressure). A spiral glass tube connected to the exit valve collected any non-volatile material that was removed from the extract. REFERENCES