A Novel Technology for Desulfurization of FCC Diesel Fuels: Combination of Hydrogenation and Oxidation-assisted Ultrasound

摘要

This new route that integrates with hydrodesulfurization (HDS) and ultrasound-assisted oxidation desulfurization (UAODS) technology can be studied to decrease the sulfur content of high sulfuric FCC dieselfuel. In the integrating technology, the conventional HDS unit continues to produce below 500 μg/g hydrotreated diesel fuels, with UAODS unit used to make sulfur content below 50 μg/g, or even below 10 μg/g of diesel fuels. Since it has been discovered that cavitation can be originated from ultrasonic irradiation in water, ultrasound is an increasingly used tool to enhance chemical process rate. The addition of Fenton 's reagent can enhance the sono-oxidative desulfurization efficiency for diesel fuels. UAODS has more advantages in removing thiophene and alkyl-thiophenes that are less reactive than other organosulfur species present in these hydrocarbon streams (e.g., alkyl sulfides, mercaptans) using HDS technology. The key to success is that the oxidative desulfurization process must be cost-effective versus the HDS revamp alternative available to refiners.