Kinetics of decomposition of CaCo3 in an Australian oil shale

✍ Scribed by David J. McCarthy

• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 211 KB
• Volume: 62
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(83)90074-1

✦ Synopsis

Communications

mesophase portion is very difficult and therefore incomplete most of the time, especially when samples contain a high concentration of insoluble material. It seems probable that the pitch incompletely stripped from the aggregate of mesophase with a-resins was responsible for higher yields of mesophase found in the presence of c1resins originally present in pitch.

The present finding is supported by the results of viscosity measurements of pitches measured at < 400"C3. Pitches with a small concentration of a-resins showed a rapid viscosity rise as soon as their temperature reached 400°C but this behaviour was not exhibited by pitches with a high concentration of a-resins. In the latter case, the rapid viscosity rise was detectable after a significant time delay, i.e. after a longer heat exposure. The rapid rise of viscosity is caused by the formation and coalescence of mesophase, and the higher concentration of a-resins delays the mesophase coalescence as was demonstrated by the microscopic study just described.