Western subbituminous coal, effect

Similarly, a subbituminous coal (Wyodak-Anderson) which gave only 60% conversion at 427°C in 2 minutes could be converted to >70% at 460°C with no ill effects (see Figure 17). At 470°C there was an indication that conversion had begun to decline at 2 minutes however, this data is extremely limited. The implications of these results with a western subbituminous coal is that a low sulfur boiler fuel may potentially be produced in a single-stage short contact time process. 

Table III shows that hydrogenated and unhydrogenated SRC recycle solvents were equally effective for the conversion of a western subbituminous coal at low reaction severity. At higher severity but at times shorter than 10 minutes, significantly higher conversions were achieved only with the hydrogenated solvents which could donate more hydrogen.

The Effect of Solvent Compositions on the Liquefaction Behavior of Western Subbituminous Coal... 

Western subbituminous coals can be readily liquefied and desulfurized by non-catalytlc liquefaction vlth synthesis gas and steam at 400-450°C and an operating pressure of 3800-4400 psl. The mineral matter present In these coals functions as effective catalysts for promoting the water gas shift reaction and the reduction of carbonyl groups to oil soluble products. 

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