Gasoline processing method

Abstract

A gasoline processing method includes: subjecting raw materials of full distillates to a fractionating tower to be fractioned into three fractions, and removing mercaptan sulfur in a light fraction by means of alkali extraction to obtain a liquid product I which is a gasoline blending component; processing an intermediate fraction through a first hydrogenation unit to obtain a liquid product II which is a qualified aromatics extraction raw material; and processing a heavy fraction through a second hydrogenation unit to obtain a liquid product III which is a gasoline blending component. By the gasoline processing method, a qualified aromatic hydrocarbon product and a qualified gasoline product can be obtained simultaneously, sources of the aromatic hydrocarbon product are widened, and compared with raw materials, the obtained gasoline product has the advantages that the induction period is greatly prolonged, sulfur content is greatly reduced, and aromatic hydrocarbon content, especially benzene content is reduced.

Description

technical field [0001] The invention pertains to a method for refining hydrocarbon oils in the presence of hydrogen, more particularly to a hydrogenation method for treating secondary processed gasoline fractions. Background technique [0002] With the continuous development of petrochemical and textile industries, the world's demand for aromatics products continues to grow, especially the demand for benzene and xylene is growing faster. For a long time, the output of aromatic products in my country has not been able to meet the demand. At present, most of the sources of aromatics are gasoline produced by catalytic reforming units of refineries and pyrolysis gasoline produced by ethylene units. The method of separating aromatics from these two gasolines is mainly solvent extraction. Therefore, how to broaden the sources of raw materials for aromatics extraction is a problem that needs to be solved. [0003] In addition, with the increasingly stringent environmental protect...

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Problems solved by technology

[0005] According to the existing hydrofining technology, there are many problems in directly desulfurizing and denitrifying DCC gasoline: due to the high diene content in DCC gasoline, it is easy to polymerize and coke at the top of the catalyst bed, resulting in an increase in the pressure drop of the reactor. Greatly affect the long-term stable operation of the device

[0006] CN1990830A discloses a coker gasoline hydrofining method, the method is first contacted with a hydrogenation protecting agent at a low temperature, and then contacted with a hydrofinishing catalyst at a high temperature, the olefin content in the refined gasoline fraction is less than 1% by volume, The sulfur content is less than 300μg / g, and the nitrogen content is less than 2μg / g, both of which can meet the feed requirements of the reforming prehydrogenation unit and steam cracking ethylene unit. This process can delay the pressure drop of the reactor and prolong the refueling of coker gasoline. Hydrogen unit operating cycle, but the content of sulfur and nitrogen in coked gasoline is still high after treatment, and further treatment is needed

However, the method itself does not involve desulfurization. After the treatment by this method, the sulfur content in the product is hardly reduced. Using it as a gasoline blending component will result in a higher sulfur content in motor gasoline. It is not suitable under the strict general trend

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