Abstract
A preliminary screening of spanish coals including samples of Anthracite from 19 mines, of Bituminous and Subbituminous coal from 32 mines and Hard and Soft brown coal (Lignites) from 32 mines was made based on their proximate and ultimate analysis, looking for the most promising ones as raw materials for liquefaction processes. Relationships between different coal characteristics were established. Ergun correlation between gross calorific value and moisture content seems not to be acceptable for spanish coals. Some of the coals selected (Lignites) were studied via petrographic characterization, and finally tested in a laboratory autoclave reactor of 400 c.c. under standarized operating conditions. Correlations between coal characteristics and the liquefaction yields obtained are compared with other data from the Technical Literature. The results obtained for subbituminous coals about the influence of rank in liquefaction has been verified for our lignites.
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