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Abstract : |
The performance of the two CoMo catalysts was evaluated for hydrodesulfurization of two Saudi naphthas in a bench-scale unit under Industrial conditions. Various types of sulfur compounds in the naphtha feed stocks and products were determined by chemical analysis and gas chromatography. The results show that the product sulfur decreased with increasing temperature down to a minimum, followed by an increase at higher temperatures. This increase was attributed to the occurrence of H2S-alkene recombination reaction leading to the formation of mercaptans. The effect of increasing the space velocity was to slightly increase product sulfur, while the hydrogen gas rate had an insignifcant effect. The product sulfur for the two catalysts was below 1 ppm in the temperature range 280-350 degrees C. However, one catalyst was selected based on its superior HDS performance attributed to higher concentrations of molybdenum, cobalt and phosphorus oxides., |
