Method for gasoline hydrogenation modification

Abstract

The invention relates to a method for gasoline hydrogenation modification; gasoline raw materials and hydrogen are mixed, and the mixture is allowed to enter a catalytic distillation tower for dialkene removal, and then to cut the gasoline into light and heavy components; light gasoline from the catalytic distillation tower top is directly used as a clean gasoline blending component; heavy gasoline from the bottom of the tower is allowed to enter a hydrogenation modification reactor for reactions such as aromatization, isomerization, and the like, and then to enter a hydrodesulfurization reactor for supplementary refining; materials from the hydrodesulfurization reactor is cooled, and is allowed to enter a product separation device for gas-liquid separation; hydrogen from the gas-liquid separation device is treated by desulphurization and then recycled; liquid products are allowed to enter a desulfurization tower for further reducing the mercaptan content of the gasoline, and then are mixed with the light gasoline to obtain the hydrogenation modified gasoline products; the method of the invention can not only greatly reduce sulfur and alkene contents in the gasoline, but also can reduce octane number loss due to the modification process.

Description

technical field

[0001] The invention relates to a method for hydrogenation and upgrading of low-quality gasoline, in particular to a method for hydrogenation and upgrading of secondary processed gasoline such as catalytic cracking gasoline. Background technique

[0002] In recent years, in order to protect the environment, countries around the world have put forward stricter restrictions on the composition of engine fuel in order to reduce the emission of harmful substances. Beijing implemented the Beijing local standard DB11 / 238-2007 for motor gasoline on January 1, 2008. The standard stipulates that the sulfur content of motor gasoline should not exceed 0.005% (m / m), and the olefin content should not exceed 30%. It is expected that Beijing will implement the National V standard in 2012, stipulating that the sulfur content of motor gasoline shall not exceed 0.001% (m / m), and the olefin content shall not exceed 25%. The proportion of FCC gasoline in my country's motor gasol...

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