Low energy consumption catalytic gasoline hydrodesulfurization method

Abstract

The invention discloses a low-energy consumption catalytic gasoline hydrodesulfurization method. The method comprises: adjusting the operating conditions of a catalytic device fractionating tower, conducting pre-separation on FCC (fluid catalytic cracking) gasoline in the fractionating tower so as to obtain light fractions at the tower top and heavy fractions at a lateral line; subjecting mercaptan in the light fractions to hydroconversion into a heavy sulfide, leaving the treated light fractions to enter a hydrogenation prefractionator to fractionate light gasoline and medium gasoline; carrying out moderate selective hydrodesulfurization on the medium gasoline, performing deep selective hydrodesulfurization on the heavy gasoline, subjecting the obtained two refined products to gas stripping, and then mixing them with the light gasoline undergoing mercaptan hydroconversion, thus obtaining a clean gasoline product. Compared with the existing catalytic gasoline hydrodesulfurization technologies, the method provided in the invention can significantly reduce equipment energy consumption, the gasoline octane number loss is small, the obtained gasoline product quality can meet the quality requirement of a sulfur content of less than 10 micrograms / g, and the economic benefits of oil refining enterprises are improved obviously.

Description

technical field

[0001] The invention relates to a method for hydrodesulfurization of catalytic gasoline with low energy consumption, in particular to a method for hydrogenating catalytic gasoline as a raw material to produce clean gasoline blending components with a sulfur content less than 10 μg / g. Background technique

[0002] With the increasingly stringent environmental protection regulations, developed countries such as Europe and the United States have successively put forward stricter regulations on the content of sulfur and olefins in motor gasoline. From 2009 onwards, the Euro V emission standard with a sulfur content of less than 10 μg / g will be implemented. my country's requirements for the sulfur content of motor gasoline are becoming more and more stringent. Since January 1, 2008, the gasoline supplied to Beijing has begun to implement the specifications equivalent to Euro IV emission standards, that is, the sulfur content is less than 50 μg / g, and Shanghai, Gua...

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