RELATIONSHIP BETWEEN PROPERTIES AND CONVERSIONS OF NORTH BOHEMIAN COALS DURING COAL OIL COPROCESSING/

Eleven low rank coals from North Bohemian mines were comprehensively c haracterized by using a number of analytical methods. Along with commo n proximate and ultimate analysis, spectroscopic techniques, porosity measurement, extractability and swelling in organic solvents were used . Although coals were of similar geological origin, some of their char acteristics largely differed from one coal to another. Coals were copr ocessed with petroleum vacuum residue at 440 degrees C for 1 h and yie lds of reaction products and coal conversions were determined. Despite the differences in composition and properties, the coals provided sim ilar conversions and yields of distillable reaction products. A small positive effect on coal conversion was found for ash content and micro porosity of coals, However, a small negative effect was found for carb on content, optical reflectance and solvent extractability of coals.