Gasoline deep desulfurization method, and equipment used for gasoline deep desulfurization

Abstract

The invention belongs to the field of hydrocarbons refining, and discloses a gasoline deep desulfurization method and equipment used for gasoline deep desulfurization. The gasoline deep desulfurization method comprises following steps: 1, gasoline raw material is subjected to pre-hydrogenation so as to obtain pre-hydrogenated gasoline raw materials; 2, the pre-hydrogenated gasoline raw materials are subjected to fractionation so as to obtain light fractions, medium fractions, and heavy fractions; 3, the medium fractions are contacted with an extraction solvent so as to obtain a sulfur-containing solvent and solvent-extracted medium fractions, separation is adopted to separate the sulfur-containing solvent from sulfides contained by the sulfur-containing solvent so as to obtain a solvent extracted sulfur-containing material and a recycled sulfide-free solvent; 4, the heavy fractions are subjected to selective hydrogen desulfurization reaction so as to obtain hydrogenated heavy fractions; and 5, the light fractions, the solvent extracted medium fractions, and the hydrogenated heavy fractions are mixed so as to obtain gasoline products. The gasoline deep desulfurization method is capable of obtaining gasoline products lower in sulfur content without large reduction of octane value.

Description

technical field [0001] The present invention relates to the refining field of hydrocarbon materials, in particular, to a method for deep desulfurization of gasoline and a device for deep desulfurization of gasoline, and more specifically, to a kind of sulfur-containing gasoline through hydrogenation and non-hydrogenation A combination of deep desulfurization process. Background technique [0002] As we all know, the emission of toxic and harmful substances in automobile exhaust seriously affects the air quality. For this reason, countries all over the world have set stricter and stricter standards for the quality of oil used as engine fuel. From January 1, 2013, my country has implemented No. IV emission standards nationwide, and has implemented No. V emission standards in Beijing, Shanghai and other major cities. No. Ⅳ and No. Ⅴ emission standards respectively stipulate that the sulfur content in motor gasoline shall not exceed 50 μg / g and 10 μg / g. [0003] The sulfur in ...

AI Technical Summary

Problems solved by technology

However, studies have found that the sulfur-rich materials produced during the lye extraction process usually carry a small amount of alkali and colloids, which can easily lead to poisoning and coking of the hydrogenation catalyst when entering the hydrogenation system, while the sulfur-containing materials produced during the solvent extraction process Materials often also contain unstable impurities, which are not conducive to direct hydrogenation treatment, especially under high-temperature hydrogenation conditions in pursuit of higher desulfurization rates; on the other hand, conventional liquid-liquid solvent extraction is usually not suitable for all The sulfides are selective, and when the extracted material is separated from the extraction solvent, it is often entrained with each other (usually requires further follow-up treatment, such as washing the extracted material with water, etc.), while the positive pressure ( Above the standard atmospheric pressure), distillation of the solvent with the extracted material is difficult to recover the extraction solvent, and even leads to side reactions such as high temperature degradation of the extraction solvent, reducing the ability of the solvent to continue to extract sulfides

Images