Method for ion liquid abstraction-catalytic oxidation desulfurization

Abstract

The invention relates to a method which uses ionic liquids extraction coupling tungsten, molybdenum and other polyoxometallate to catalyst oxidation so as to reduce the content of sulfur in the oil. The invention dissolves the catalyst into the ionic liquid and the volume ratio of the ionic liquid and the oil is 1:3 to 1:5, and the quantity range of the catalyst and the sulfur compounds is 1:100 to 4:100. The concentration of the aqueous hydrogen peroxide is 5 percent to 40 percent, and the content range with the sulfur compounds in the oil is 1:2 to 1:10. When the temperature is between 30 and 70 DEG C and the reaction time is 0.5 to 3 hours, coupling catalyst oxidation is extracted to reduce the content of sulfur in the oil to be less than 10 ppm. Compared with the traditional method, the method has the advantages that the sulfur has high removal efficient, and the reaction system is very simple, and the reaction condition is very soft and no pressure equipment is needed; the separation is very convenient and the ionic liquid can be recycled.

Description

technical field [0001] The invention relates to a method for reducing sulfur content in gasoline by coupling ionic liquid extraction with polyoxometalate to catalyze hydrogen peroxide oxidation. Background technique [0002] The sulfur compounds in gasoline will produce a large amount of sulfur dioxide during the combustion process. Sulfur dioxide is the main cause of acid rain, which will cause a wide range of environmental pollution and seriously threaten the ecological balance of the earth. Countries around the world have increasingly strict requirements on the sulfur content in gasoline. For the sulfur content in gasoline, the United States in 2006 required the sulfur content of diesel and gasoline to be lower than 15ppm and 30ppm; Europe currently requires the sulfur content in gasoline to be below 30ppm. The sulfur content is required to be below 50ppm. At present, the standard of sulfur in gasoline in my country is lower than 800ppm, which is far behind developed cou...

AI Technical Summary

Problems solved by technology

Later reported ionic liquids also [C 4 mim] Cl, [C 4 mim] Br, [C 4 mim]Cl / CuCl, [C 4 mim]Cl / ZnCl 2 , [C 4 mim]Cl / SnCl 2 , tertiary amine / AlCl 3 , trimethylamine hydrochloride / AlCl, [C 2 mim][EtSO 4 ], [C 4 mim][OcSO 4 ], [C 6 mim][Tf 4 N] and phosphate ionic liquids, etc. These ionic liquids mainly examine the effect of extraction and desulfurization, and generally speaking, there is a problem of low sulfur removal rate.