Flash hydropyrolysis of coal. Progress report No. 7, July 1-December 31, 1978

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A considerable number of runs on the flash hydropyrolysis of lignite has been made and the data used in correlating the parametric study of the process chemistry. The production of gaseous hydrocarbons (methane and ethane) was studied as a function of the feed hydrogen to coal ratio. The gaseous yield was observed to vary with this ratio to the 0.18 power at pressures of both 1000 psi and 2500 psi. The rate of increase of gaseous yield was shown to be approximately 2 to 2.5% in yield for each 100 psi increase in pressure for H/coal ratios of both 1 and 0.25. The higher H/coal ratio produced an approximately 20% greater overall conversion than the lower ratio. Methane concentrations as high as 34.4% were produced in the process stream at a H/coal ratio of 0.23 and a temperature and pressure of 875/sup 0/C plus 2500 psi. This high methane concentration is 60% of the thermodynamic equilibrium concentrations under these temperatures and pressures. Further attempts were made to operate the

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