Syed A. Ali, Jamal A. Anabtawi King Fahd University of Petroleum & Minerals Dhahran, Saudi Arabia Pilot plant studies have shown that the presence of even very small amounts of olefins may limit the desulfurization of reformer feedstocks to trace levels. Engineers at the Research Institute of King Fahd University of Petroleum & Mineral observed under typical industrial conditions the recombination reaction of olefins with hydrogen sulfide to form mercaptans. The results indicate that the advantage of using highly active (third generation) CoMo hydrotreating catalysts can be masked by these reactions if the olefins are not ...

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