Abstract
Two lignite samples, Beulah No. 3 and Big Brown No. 1, were liquefied at 420 °C using H 2 and synthesis gas to determine the optimum beneficial amount of H 2S in the batch autoclave reactor. Under the conditions employed, 50–100 psi partial pressure of H 2S, nominally 4–10 wt% of daf lignite, was optimum for both samples. Synthesis gas outperformed H 2 with and without H 2S for the liquefaction of the two coals.
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