Catalysts for upgrading coal-derived liquids. Quarterly report, June 9--September 8, 1977. [Rasyn oil; 700/sup 0/F; 1500 psig

Abstract

One experimental run was conducted to assess a composite feedstock (a mixture of equal volumes of raw anthracene oil and Synthoil II liquid). The reactor was prematurely shut down at the end of 185 hours due to plugging. At the Catalyst Life Test Unit ten experimental runs have been conducted, two of which are still continuing. Rasyn oil, a mixture of equal volumes of raw anthracene oil and Synthoil II liquid has been used as the feedstock. Rasyn oil has been successfully hydrotreated at 700/sup 0/F (371/sup 0/C), 1500 psig and for volume hourly space times of 1.25 and 2.5 hours for 674 and 501 hours of oil-catalyst contact. Experimental run series at temperatures of 750/sup 0/F (399/sup 0/C) has resulted in premature shut down due to reactor plugging. Relatively stable sulfur removal activity has been observed during the 176 hours of Synthoil II liquid hydrotreatment operation. In the case of Rasyn oil the hydrodesulfurization activity at 700/sup 0/F (371/sup 0/C), 1500 psig and 1.25 LVHST seems to decrease after 400 hours of operation. Significant hydrodenitrogenation activity decay has been observed in hydrotreating Synthoil II liquid as well as Rasyn oil. The CLTU computer is now monitoring the Catalyst Life Test Unit on a continuous basis and is recording the temperature and pressure profiles every hour. The molecular weight range for the principal compound types present in the asphaltene neutrals isolated from COED coal liquid was reinvestigated. The new data substantiate a considerably broader carbon number distribution for most of the Z and Z(0) series.