Process for removing sulfur in crude oil using microwaves

A process for removing sulfur (S)-containing compounds in a crude oil material, comprising the steps of:

• (a) mixing the crude oil material with a removing agent, which comprises a phosphoric acid ester and an aqueous phase, and subjecting the reaction mixture to stirring and microwave heating for a first period of time, at a temperature which is lower than the boiling point of the removing agent;
• (b) adding a first mixture of solvents including water to the reaction mixture, and subjecting the aqueous reaction mixture to stirring for a second period of time, at a temperature which is less than about 95° C. using microwaves for heating;
• (c) allowing the aqueous reaction mixture to stand for a third period of time, thereby obtaining an oil phase comprising a treated oil and one or more phases including an aqueous phase;
• and
• (d) subjecting the aqueous reaction mixture to separation thereby yielding the treated oil.