A two-stage catalytic gasoline upgrading method for producing ultra-low sulfur gasoline by increasing gasoline yield

Abstract

The invention discloses a two-stage catalytic gasoline upgrading method for increasing gasoline yield and producing ultra-low sulfur gasoline. The method comprises the following steps: (1) a mixture of liquefied petroleum gas and full-range FCC (fluid catalytic cracking) gasoline is mixed with hydrogen, and the mixture firstly enters an alkylation fixed bed reactor to undergo an alkylation reaction under the action of an alkylation catalyst so as to convert most C4 hydrocarbon and parts of olefins in the FCC gasoline to C8-C12 isoparaffin; and (2) a reaction mixture obtained from the step (1) and hydrogen are mixed to simultaneously undergo hydrodesulfurization of a sulfocompound and alkane and olefin cracking, congruence, cyclization and aromatization reaction under the action of hydrodesulfurization / aromatization catalysts so as to produce upgraded ultra-low sulfur gasoline. The invention provides a gasoline upgrading method which is used to produce ultra-low sulfur gasoline by using high-sulfur and high-olefin FCC gasoline as a raw material and simultaneously greatly reduce gasoline yield loss of and octane number loss.

Description

technical field [0001] The invention relates to a two-stage catalytic gasoline upgrading method for producing ultra-low-sulfur gasoline by increasing gasoline yield, in particular to a method for producing sulfur content less than 10 μg / g under the premise of increasing gasoline yield and reducing octane number loss A two-stage catalytic gasoline upgrading method for ultra-low sulfur gasoline. Background technique [0002] Reducing the sulfur content of gasoline can effectively control the pollution of automobile exhaust to the atmosphere. Therefore, the sulfur content standards in gasoline are becoming more and more stringent in countries all over the world. Europe began to implement the Euro IV emission standard in 2005, requiring that the sulfur content in gasoline should not exceed 50 μg / g; in 2008, it began to implement the Euro V emission standard, that is, the sulfur content in gasoline should not exceed 10 μg / g; by 2014, Europe will plan to Implement Euro VI, that i...

AI Technical Summary

Problems solved by technology

Therefore, in addition to the fact that my country’s own or imported technologies are mainly used to produce National III and some National IV gasoline, and there are many difficulties in the production of National V or even sulfur-free gasoline, it cannot but be said that these technologies are facing a large loss in gasoline yield. Achilles' heel

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