Hydrogenation method for deeply desulfurizing gasoline

Abstract

The invention provides a hydrogenation method for deeply desulfurizing gasoline. The hydrogenation method comprises the steps that catalytically cracked gasoline is fractionated into light fractions and heavy fractions; the heavy fractions and hydrogen are mixed and enter into a first hydrogenation reaction zone to react to obtain low-sulfur heavy fraction oil, and the recycle hydrogen obtained through separation is recycled after desulfurization; the light fractions and hydrogen are mixed and enter into a second hydrogenation reaction zone, diene is subjected to hydrogenation saturation to obtain mono-olefin low-boiling sulfides and the mono-olefin low-boiling sulfides are converted to high-boiling sulfides; the hydrogenated light fraction oil enters a light-medium fraction fractionating tower and is divided into light fractions and medium fractions and low-sulfur light fraction oil is obtained; the medium and light fractions and hydrogen are mixed and enter into a third hydrogenation reaction zone to react to obtain low-sulfur medium fraction oil, and the recycle hydrogen obtained through separation is recycled after desulfurization; and the heavy fraction oil, the light fraction oil and the medium fraction oil are mixed to obtain the low-sulfur gasoline product. Aiming to produce the gasoline with sulfur content not more than 10mu g / g, the method provided by the invention has the characteristics of high desulfurization depth, long device running period and the like.

Description

technical field [0001] The invention belongs to a method for refining hydrocarbon oil under hydrogen-facing conditions in the field of petrochemical industry. Specifically, the invention relates to a hydrogenation method for deep desulfurization of gasoline. Background technique [0002] With the rapid development of the automobile industry, people pay more and more attention to the pollution of automobile exhaust. In order to protect the environment, countries all over the world have put forward stricter requirements on the composition of vehicle fuels in order to reduce the emission of harmful substances. Sulfur limits are more stringent. my country's gasoline standards for vehicles have also gradually become stricter in recent years: On July 1, 2005, the national gasoline implemented the National II standard, and the sulfur content was ≯500μg / g; on December 31, 2009, the national gasoline implemented the National III standard, and the sulfur content was ≯ 150μg / g; the sta...

AI Technical Summary

Problems solved by technology

[0012] In order to overcome the limitations of the existing catalytic cracking gasoline hydrodesulfurization technology, the present invention provides a hydrogenation method for deep desulfurization of gasoline. The main purpose is to produce gasoline with a sulfur content ≯ 10 μg / g. Less loss of value, strong adaptability of raw materials, flexible operation, long operation period of the device, etc.

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