Method for producing low-sulfur gasoline by non-hydroforming sulfur and alcohol removal

Abstract

The invention relates to a method for producing low-sulfur gasoline by non-hydroforming sulfur and alcohol removal, which comprises the following steps that: (1) gasoline raw materials are fractionated into light and heavy gasoline fractions, the light gasoline fractions are subjected to alkali washing sulfur and alcohol removal, and the heavy gasoline fractions are subjected to hydrogen desulfurization; and (2) the heavy gasoline fractions after the hydrogen desulfurization are introduced into a counter flow contact reactor, sulfur and alcohol removal catalysts are filled in positions under a material inlet of the reactor, steam stripping media which do not contain hydrogen gas are introduced into the bottom of the reactor, liquid phase ingredients of the heavy gasoline fractions in the counter flow reactor are in counter flow contact with the steam stripping media, the regeneration sulfur and alcohol in the materials are decomposed into olefin and hydrogen sulphide on catalysts, the heavy gasoline heavy ingredients after the sulfur and alcohol removal flow out from the tower bottom, heavy gasoline light ingredients, steam stripping media and hydrogen sulphide gas are discharged from the top of the reactor, the heavy gasoline light ingredients after the H2S removal, the heavy gasoline heavy ingredients after the sulfur and alcohol removal and the light gasoline fraction after the alkali washing are mixed to obtain the gasoline products. The gasoline product produced by adopting the method provided by the invention belongs to the gasoline product with the advantages that the sulfur and alcohol content is lower than 3mug/g, the sulfur content meets the Euro IV discharge standard, and in addition, the octane number loss is little.

Description

technical field [0001] The invention relates to a method for desulfurizing gasoline. More specifically, it is a method for reducing the sulfur content and mercaptan content in gasoline, especially reducing the regenerated mercaptan content in gasoline after hydrodesulfurization, and producing low-sulfur gasoline. Background technique [0002] As people's awareness of environmental protection continues to increase, the specifications of motor gasoline indicators such as oxygen content, vapor pressure, benzene content, total aromatics content, boiling point, olefin content and sulfur content will become more and more stringent, especially sulfur content. In 2008, Beijing took the lead in implementing the National IV gasoline standard, requiring the sulfur content to be less than 50 μg / g and the mercaptan content to be less than 10 μg / g. The content of total sulfur and mercaptan sulfur is also required to be further reduced. [0003] FCC gasoline in my country is the main ble...

AI Technical Summary

Problems solved by technology

These macromolecular mercaptans are stable in nature. The traditional Merox catalytic oxidation of mercaptans can only convert mercaptans into disulfides to reduce the sulfur content of mercaptans, but the total sulfur of the product has not been reduced.

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