Method for deep desulfurization of gasoline

Abstract

The invention provides a method for the deep desulfurization of gasoline, belonging to the oxidation-extraction desulfurization technology. The method comprises the following steps: adding ionic liquid and solid manganese dioxide to the gasoline to be subjected to deep desulfurization to form a three-phase system; heating and stirring the three-phase system under the microwave condition so as to conduct the deep oxidation desulfurization reaction; and standing and carrying out solid-liquid separation; and washing the obtained filtrate by adding clean water, then, standing, and carrying out liquid separation to obtain the gasoline with lower sulfur content. Compared with the prior art of hydrodesulfurization, the invention has the advantage that the octane number of the gasoline cannot be reduced; compared with the prior art of oxidation desulfurization, the invention has the advantages of relaxed technological conditions, secondary pollution prevention, simple operation and lower cost; and the invention further has the advantage that the method is favorable for recycling the solid manganese dioxide and ionic liquid used in the reaction process.

Description

technical field [0001] The invention relates to a gasoline desulfurization method, in particular to a gasoline deep desulfurization method. Background technique [0002] Compared with straight-run gasoline, one of the advantages of FCC gasoline is its high octane number, which can save a lot of anti-knock additives when used as motor gasoline. Therefore, most of the motor gasoline (about 70%) is Catalytically cracked gasoline. However, FCC gasoline has the disadvantage of high sulfur content, and the sulfur oxides (SO X ) is a threat to human health, therefore, at least FCC gasoline, which is used as a refined product oil for vehicles, must be desulfurized. Among the desulfurization methods commonly used in industry at present, there are two categories of hydrodesulfurization technology and non-hydrogenation desulfurization technology, and the latter uses oxidative desulfurization technology as one of the main methods. From the perspective of desulfurization effect, they ...

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Problems solved by technology

However, in the existing hydrodesulfurization technology, there are problems such as the octane number will be reduced to varying degrees, the equipment cost is high, and the operating cost is expensive; although oxidative desulfurization has the advantage of not reducing the octane number of gasoline, but Among the existing oxidative desulfurization technologies, only catalytic oxidation technology can carry out deep desulfurization and reach the level of industrial application. However, the existing catalytic oxidation technology has harsh catalytic oxidation conditions, easy loss of catalytic active components, and desulfurization process. The problem of secondary pollution is easy to occur (see: Zhou Hancheng, Chen Nan, Shi Feng, etc. Research on new technology of ionic liquid extraction and desulfurization [J]. Molecular Catalysis, 2005, 19(2): 94.)

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