Pyridine solubles Wyodak coals

MAF Coal Conversions to Pyridine Solubles. MAF coal conversions, based on ash analyses, are shown for each coal-solvent combination in Figure 3. Subbituminous coal is converted more slowly, resulting in lower conversions at identical reaction severities than bituminous coal. Maximum conversions are higher with bituminous coal, approaching 90 percent on an MAF basis for the Monterey coal compared to about 75 percent for Wyodak coal. 

In this Laboratory, several potential liquid-phase treating agents have been studied at 225-275°C—that is, at temperatures well below 325°C, which appears to be the initiation temperature for pyrolysis of the coals studied here. Working with Wyodak coal in a ZnC -water melt at 250°C, Holten and coworkers (2,3) discovered that addition of tetralin increased the pyridine solubility of product to 75%, compared to 25% without tetralin. About 10 wt-% of water is required in the melt, because pure ZnC melts at 317°C. 

TABLE III. RELATIONSHIP BETWEEN REACTION TIME, TEMPERATURE, REACTION SEVERITY AND CONVERSION OF WYODAK COAL TO PYRIDINE SOLUBLES... 

Figure 3. Comparison of conversion of MAF Wyodak (—035 solvent (A/ —0/9 solvent (0)) and Monterey (—035 solvent (O) —019 solvent ( Z )) coals to pyridine solubles (based on ash analysis)...

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