HYDROPYROLYSIS OF COALS UNDER PRESSURE - INFLUENCE OF COAL PRETREATMENT ON THE HYDROPYROLYSIS YIELDS AND MECHANISMS
Studies on hydropyrolysis of coal have been continued. The influence of various pretreatments, catalytic or not, on the hydropyrolysis yields has been investigated. Several gaseous pre-treatments have shown that a H(2) pretreatment slightly increases the oil yield and improves its quality, whereas He, CO(2) and steam have a negative influence. 5% H(2)S in H(2) increases the rate of oil formation. The study of the characteristics of the chars has been continued. The evolution of the porosity, the microhardness, the exinite reflectance and fluorescence during coal pyrolysis under He and H(2) pressure have shown the role of H(2) during the first step of the devolatilisation. Oxy- and carboxyreactivities in fixed and fluidised beds have been studied, showing the importance of the pyrolysis condition on the combustion rates. The study of the hydrocracking of a phenolic fraction has been completed. The best conditions for on-line postcracking have been determined, leading to a chemical upgrading of the pyrolysis oil. The study of the fate of organic sulphur under pyrolysis and hydropyrolysis conditions has been completed. The cracking mechanisms of the thiophenic compounds under H(2) pressure have been demonstrated.
Bibliographic Reference: EUR 12628 FR (1990), 83 PP., FS, ECU 7.50 ISBN 92-826-1215-5 THE OFFICE FOR OFFICIAL PUBLICATIONS OF THE EUROPEAN COMMUNITIES, L-2985 LUXEMBOURG
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Record Number: 1989128053300 / Last updated on: 1990-11-09
Available languages: fr