Application of a single-cell high-pressure DTA technique to coal hydrogenation research

✍ Scribed by Kazuo Makino; Shigeru Ueda; Michio Shibaoka

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 277 KB
• Volume: 57
• Category: Article
• ISSN: 0016-2361
• DOI: 10.1016/0016-2361(78)90201-6

✦ Synopsis

and the acid 'asphaltenes'. But the aliphatic character is generally stronger than the aromatic in the lignites studied.

There are no absorptions at wavenumbers above 3100 cm-l (see Figures 1 and2), showing the absence of alcoholic or phenolic groups. In this, the present fractions differ sharply from the 'asphaltenes' produced by modern coal-liquefaction processes.

All the fractions show absorption bands in the region 1800-1500 cm-l, assigned to double bonds, oxygencarbon and carbon-carbon. The most intense absorption is at 1700-1735 cm-l, assigned to carboxylic carbonoxygen.

The band of intense absorption at 1760-1750 cm-l is characteristic of the fractionation of bitumen': two sharp bands at 1700 and 1730 cm-l in acid 'asphaltenes' and one at 1730 in basic 'asphaltenes'. By methylation with diazomethane these bands move to 1740 cm-l, and the absorption at 1120 cm-l disappears. These observations agree