Abstract: The sulfur content of refined liquefied petroleum gas (LPG) often fails to meet the requirements of downstream users. Therefore, the study of high selective and deep desulfurization of LPG with H₂O₂ as oxidant under the specific catalyst was carried out. The most common residual sulfide in refined LPG was used to prepare model oil to explore the reaction conditions, and then the desulfurization test of refined C₄ was carried out under the best conditions. The results show that when C is the catalyst, the reaction temperature is 35℃, the molar ratio of n(H₂O₂)/n(S) is 4, and the concentration of H₂O₂ is 30%, the desulfurization rate of the simulated oil can reach more than 98%. Under the same conditions, the desulfurization rate of refined C₄ is only 50%, but after optimizing the mixing mode of H₂O₂, catalyst and refined C₄, it is found that the desulfurization rate of refined C₄ is close to 100%. In addition, the method has little effect on the hydrocarbon composition of hydrocarbon oil or refined C₄, indicating that this method has higher selectivity for oxidative removal of sulfide, and is expected to be used for ultra deep desulfurization of LPG in the future.

Key words: LPG, H2O2, catalytic oxidation, desulfurization