Ageing of SRC II middle distillate from Illinois No. 6 coal: 1. In presence of copper and oxygen

✍ Scribed by Laudie Jones; Norman C. Li

• Book ID: 103092621
• Publisher: Elsevier Science
• Year: 1983
• Tongue: English
• Weight: 603 KB
• Volume: 62
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(83)90057-1

✦ Synopsis

The middle distillate from Illinois No. 6 solvent-refined coal (SRC II) is relatively stable to ageing by direct oxygenation at 335 K. Metallic copper accelerates oxygen ageing as is evident from an increase in viscosity and formation of pentane-insoluble components.

1.1. spectra of aged samples show a significant reduction in the intensity of the free hydroxyl band. FT-i.r. spectra show that oxygencontaining compounds of the coal are concentrated in the pentane-insoluble fraction and that oxygen bubbled into the coal liquid is incorporated into the structure of this fraction. Gel permeation chromatograms also show the formation of aggregates of large molecular-size during ageing. 600-MHz n.m.r. spectra of the aged pentane-soluble fraction are similar to those of the unaged acid-free fraction. These results suggest that copper catalysis in the ageing reaction of the middle distillate involves the polymerization of acidic, phenolic compounds. The aged pentane-soluble fraction possesses the same viscosity as the original coal liquid, but contains less nitrogen and oxygen.