Dielectric constants of coal-derived liquids and slurries with coal at 750 MHz

✍ Scribed by Ira.B. Goldberg; Kwang E. Chung

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 458 KB
• Volume: 62
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(83)90258-2

✦ Synopsis

The real part of the complex dielectric constants of SW-1 recycle solvent, SIX-II naphtha, middle distillate and heavy distillate, and tetralin were measured over the temperature range of 23" to 140°C. Values were strongly temperature dependent, generally increasing with temperature and increasing in the sequence naphtha < heavy distillate < recycle solvent < middle distillate, and were related to the phenolic contents of the liquids. The temperature dependence was attributed to the viscosity which in turn affects the relaxation behaviour of the dipolar molecules in the liquid. Association-dissociation equilibria of the polar components also affect the dielectric constant. Measurements of slurries of the SRC-I recycle solvent with coal show that the real part of the dielectric constant, E', is given by the Looyenga equation, .G'= [E':'~+ f$, (,'i'3-~;r'3)]3, where E; and E; are respectively the real parts of the dielectric constant of the coal and the solvent and 4, is the volume fraction of the coal.