Background and Challenges A mid-continent refinery produces about 5,000 barrels of FCCU slurry oil per week. The slurry is routed to on-site storage and then loaded onto a truck to be sold as carbon black oil feedstock. The slurry oil, however, averages 250 ppm or higher of hydrogen sulfide (H 2 S) in the vapor space. In order for the slurry to be stored and transported, the hydrogen sulfide has to be scavenged to reduce the risk of danger and

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