New approach to the analysis of the 13C CP/MAS n.m.r. spectrum of coal

✍ Scribed by M.L. Burgar

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 319 KB
• Volume: 63
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(84)90239-4

✦ Synopsis

than the initial fraction, which contains more aliphatic and hydroaromatic material. Proton n.m.r. data are consistent with these aromaticity results.

Conclusions

The initial results reported here from tests in the FDU using both coal-derived distillate and residuum show that the unit is basically performing as expected. By operating the destraction device at a temperature somewhat higher than the critical temperature of the carrier fluid, it is possible to generate a liquid reflux by means of a hot finger. This phenomenon is apparently an example of retrograde condensation of the second kinds**.

Fractionation based upon volatility is observed when reflux is established. Under the conditions tested to date, operation of the FDU is more sensitive to temperature with residuum than with distillate. Further analysis of the residuum fractions collected is in progress, as also are

Short Communications

experiments to define the conditions for optimal fractionation of the residuum.