Coprocessing of Spanish lignites
This project deals with the study of the influence of coal type, vacuum residue, catalyst and temperature on the conversion and quality of liquid products. A study of the influence of partial pressure of hydrogen was also carried out. Two different Spanish lignites were coprocessed with a typical commercial vacuum residue. Two supported catalysts were prepared: one with 25% Fe as oxide, and a second with 25% Fe plus 10% Mo as oxides. Prior to their utilisation, the catalysts were sulphided. The range of temperatures studied was 350-470 C. Three levels of partial pressure of hydrogen were also checked. Experimental results show that temperature and partial pressure of hydrogen are the most important variables, producing the maximum conversion and proportion of valuable liquid fraction between 375 and 425 C. Temperatures exceeding this range produce a negative value of conversion because of the retrograde recombination reactions of radicals. They consequently lead to a formation of a greatly increased volume of gases. Comparison of the two lignites confirms the relationship between the structural composition and the level of maximum conversion attained. The main conclusion concerning the use of Fe and Fe-Mo catalysts is that the amount of sulphur found in the resulting oil fraction is lower than that obtained without the use of catalysts.
Bibliographic Reference: EUR 13679 EN (1991) 107 pp., MF, ECU 8
Record Number: 199110703 / Last updated on: 1994-12-02
Original language: en
Available languages: en