Ultrasonic oxidative desulfurization method for gasoline or diesel

An ultrasonic oxidative desulfurization method for gasoline or diesel, comprising:

• Step 1, mixing an oxidant solution with an organic acid catalyst solution to obtain a mixture solution, wherein an oxidant of the oxidant solution reacts with an organic acid catalyst of the organic acid catalyst solution to obtain a peroxy acid;
• Step 2, mixing the mixture solution with the gasoline or the diesel and heating to 50 to 70° C., and performing an ultrasonic oxidative reaction under ultrasonic waves at 20 to 25 kHz to obtain a pre-prepared oil;
• wherein a mass flow ratio of the oxidant solution, the organic acid catalyst solution and the gasoline or the diesel is (0.03-0.08):(0.01-0.03):1;
• Step 3, performing a phase separation process to the pre-prepared oil, wherein an upper layer is gasoline or diesel containing sulfone and sulfoxide, and a lower layer is an aqueous phase containing the organic acid catalyst;
• and
• Step 4, recycling the organic acid catalyst and performing a countercurrent extraction for the gasoline or the diesel to obtain a desulfurized gasoline or a desulfurized diesel;
• wherein a method for recycling the organic acid catalyst comprises:
• drying and dehydrating the aqueous phase containing the organic acid catalyst by a desiccant to obtain a dehydrated organic acid catalyst, and formulating the dehydrated organic acid catalyst into a solution and conveying the solution into the mixture solution in the Step 1.