Method for producing low-sulfur gasoline

Abstract

The invention relates to a method for producing low-sulfur gasoline, which comprises the following steps that: firstly, gasoline raw materials are fractionated into light and heavy gasoline fractions, the light gasoline fractions are subjected to alkali washing for removing sulfur and alcohol, the heavy gasoline fractions are subjected to catalytic hydrogenation for removing sulfur-containing compounds, the heavy gasoline fractions after the hydrogenation desulfuration are introduced into a counter flow reactor from the middle part, hydrogenation sulfur and alcohol removal catalysts are filled in positions under a material inlet of the counter flow reactor, hydrogen-rich gas is introduced from the bottom of the reactor, a part of heavy gasoline fractions are vaporized into gas phase ingredients and liquid phase ingredients, the liquid phase ingredients flow from top to bottom and are in count flow contact with hydrogen gas on the catalysts for carrying out hydrogenation sulfur and alcohol removal reaction, the liquid phase ingredients after the sulfur and alcohol removal flow out from the bottom of the reactor, the gas phase ingredients and other gas are discharged out from the top of the reactor, the gas phase ingredients after the condensation are mixed with the liquid phase ingredients discharged from the bottom of the tower and the light gasoline fractions subjected to the alkali washing for removing sulfur and alcohol to obtain gasoline products. When the method provided by the invention is adopted, the gasoline product with the sulfur and alcohol sulfur content lower than 3mug / g can be producted, and simultaneously, the total sulfur content of the gasoline product is reduced.

Description

technical field

[0001] The invention relates to a method for hydrogenation and desulfurization of gasoline. More specifically, it is a method of reducing the sulfur content in gasoline and the sulfur content of regenerated mercaptans to produce low-sulfur gasoline. Background technique

[0002] With the increasingly stringent environmental protection regulations, countries around the world have put forward stricter restrictions on the composition of engine fuels such as sulfur content, vapor pressure, benzene content, total aromatics content, and olefin content, among which the sulfur content in gasoline is particularly strict. At present, 90% to 99% of the sulfur in finished gasoline comes from FCC gasoline. Therefore, reducing the sulfur content of FCC gasoline is the key to reducing the sulfur content of finished gasoline.

[0003] my country's FCC gasoline is the main blending component in the gasoline blending pool, with a mass fraction of more than 80%. FCC gasoline ...

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