The invention relates to a liquid
hydrocarbon mercaptan removal technique capable of deeply removing total
sulfur, in particular to a
sweetening technique for liquefied gas in an
oil refinery. The oil refining liquid
hydrocarbon refers to components of liquefied gas and light
gasoline, wherein the liquefied gas is a
raw material for producing MTBE, and the light
gasoline is a component for producing high-cleanness
gasoline. In order to solve the problem of high total
sulfur in the oil refining MTBE and the light gasoline, according to the shape and the
distribution rule of sulfocompounds in the liquid
hydrocarbon, processes such as functional reinforcement of a recycle
solvent, three-phase mixed reinforced regeneration, regenerated catalyst and extractant separation and recycle
solvent deoxidization and the like are adopted in the conventional process of liquid hydrocarbon extraction, oxidization and mercaptan removal, so the technical effects of reinforcing the mercaptan removal depth, improving
carbonyl sulfide removal rate, and avoiding forming disulphide in the extracting, saving energy and reducing emission and the like are achieved. Thus, the liquid hydrocarbon can be deeply desulfurated, the problem of high total
sulfur in the oil refining MTBE and the light gasoline is solved and the
slag discharging quantity in the conventional process is greatly reduced.