Inhibition effects of organic nitrogen compounds on hydrodesulfurization reactions

PETR 68

Håkon Bergem, hakon.bergem@sintef.no1, Elisabeth Vollebekk2, Abdelhakim Rizki2, and Edd A. Blekkan2. (1) Dep. of Process Tecnology, SINTEF, Sem Saelands v. 4, NO-7465 Trondheim, Norway, (2) Dep. of Chemical Engineering, Norwegian University of Science and Technology (NTNU), Sem Saelandsvei 4, NO-7491 Trondheim, Norway
The inhibiting effects of adding nitrogen compounds to a model hydrotreating feed have been investigated. The catalyst used was a commercial NiMo/Al2O3, and the desulfurization of DBT and 4,6 DMDBT dissolved in a toluene-n-heptane solvent was investigated. The inhibition factor, defined as the relative difference in the pseudo first-order rate constant for the HDS of DBT, decreased in the order pyridine > quinoline> aniline, while pyrrole showed no inhibition. The trend follows the basicity of the nitrogen compounds. The inhibition of 4,6 DMDBT was much stronger, and the inhibition factor decreased in the order pyridine > quinoline > pyrrole > aniline. Based on the distribution of products and intermediates it is suggested that the HYD route was suppressed the strongest for DBT, whereas for 4,6DMDBT the DDS route was suppressed most.
 

2nd International Symposium on Hydrotreating/Hydrocracking Technologies
1:30 PM-4:30 PM, Monday, 11 September 2006 Palace -- Presidio Room, Oral

Division of Petroleum Chemistry

The 232nd ACS National Meeting, San Francisco, CA, September 10-14, 2006