Gasoline hydrodesulfurization method

A gasoline hydrogenation and gasoline technology, which is applied in hydrotreating process, petroleum industry, processing of hydrocarbon oil, etc., can solve the problems of generating mercaptan sulfur, etc., and achieve the advantages of low mercaptan sulfur content, less olefin saturation, and extended service life. Effect

Active Publication Date: 2010-07-28
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

This method adopts the hydrogenation method to remove sulfur in the light fraction, but the disadvantage is that the hydrogenation process of the light fraction produces mercaptan sulfur
In this method, when the desulfurization rate of gasoline is high, the olefin saturation rate is lower than 30%, and the antiknock index loss of gasoline is lower than 2 units, but the sulfur content of the gasoline product obtained by this method is greater than 50 μg / g

Method used

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Examples

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preparation example Construction

[0035] The preparation method of the preferred selective desulfurization catalyst is as follows.

[0036] The carrier is obtained by mixing alumina hydrate and auxiliary agents, drying, and roasting in the air for 2 to 6 hours. The carrier is immersed in the prepared aqueous solution containing cobalt and / or nickel compound, molybdenum and / or tungsten compound for 1-4 hours, dried, and calcined at 300-550°C for 2-5 hours to obtain the catalyst product.

[0037] The aqueous solution of cobalt, molybdenum, nickel and tungsten compounds can be prepared by conventional methods. Cobalt, molybdenum, nickel and tungsten compounds are selected from one or more of their soluble compounds. Wherein the molybdenum compound is preferably ammonium molybdate, and the cobalt compound is preferably one or more of cobalt nitrate, cobalt chloride, and basic cobalt carbonate. The compounds of nickel and tungsten are preferably one or more of nickel nitrate, nickel chloride, basic nickel carbona...

Embodiment 1

[0054] In this embodiment, the same raw material oil A and the same cut point of 75° C. as Comparative Example 1 were used, and the resulting light fraction (A-LCN) and heavy fraction (A-HCN) accounted for 34.7% by weight and 65.3% by weight of the raw material, respectively. The A-LCN alkali delivery and extraction unit undergoes alkali refining to remove mercaptans, A-HCN is mixed with a stream of hydrogen, enters the first hydrogenation reactor, and contacts with the dealdiene catalyst RGO-2 and the selective hydrodesulfurization catalyst C1 respectively. The diolefins and more than 80% of sulfur are removed. After separation, the liquid phase is heated by a heating furnace and enters the second hydrogenation reactor. The gas phase hydrocarbons flow upward in the upper part of the reactor under the action of the selective hydrodesulfurization catalyst C1. In the desulfurization reaction, the liquid phase hydrocarbon flows downward in the lower part of the reactor under the a...

Embodiment 2

[0068] In this example, the same feed oil B and the same cut point as Comparative Example 2 were used, and the resulting light fraction (B-LCN) and heavy fraction (B-HCN) accounted for 30.0% by weight and 70.0% by weight of the raw material, respectively. The B-LCN alkali delivery and extraction unit undergoes alkali refining to remove mercaptans, B-HCN is mixed with a stream of hydrogen, enters the first hydrogenation reactor, and contacts with the dealdiene catalyst RGO-2 and the selective hydrodesulfurization catalyst C1 respectively. The diolefins and more than 80% of sulfur are removed. After separation, the liquid phase is heated by a heating furnace and enters the second hydrogenation reactor. The gas phase hydrocarbons flow upward in the upper part of the reactor under the action of the selective hydrodesulfurization catalyst C1. In the desulfurization reaction, the liquid phase hydrocarbon flows downward in the lower part of the reactor under the action of the selectiv...

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Abstract

The invention relates to a gasoline hydrodesulfurization method, which comprises the following steps that: gasoline raw materials are fractionated into light fraction gasoline and heavy fraction gasoline, wherein the light fraction gasoline is removed mercaptan sulfer through caustic washing refining, the heavy fraction gasoline carries out a hydrogenation diene-removal reaction, a selective hydrodesulfurization reaction and a selective hydrogenation mercaptan sulfer-removal reaction respectively through two hydrogenation reactors, and the obtained hydrogenation heavy fraction gasoline and the refined light fraction gasoline are mixed to obtain full fraction gasoline with ultra-low sulfur. According to the method provided by the invention, under the condition that the desulfurization degree reaches a target, the full fraction gasoline product have small mercaptan sulfur content, less olefin saturation and small octane value loss. The mercaptan sulfur content of the obtained dull fraction gasoline product is less than 10Mug/g, the total sulfur content is reduced under 50Mug/g, and the octane value RON loss is less than 1.0 unit, particularly, the total sulfur content of the full fraction gasoline product is reduced under 10 Mug/g, and the octane value RON loss is less than 1.5 units.

Description

technical field [0001] The present invention pertains to a method of treating hydrocarbon oils in the presence of hydrogen, and more particularly, the invention relates to a method of producing low-sulfur gasoline by selective hydrodesulfurization. Background technique [0002] Air pollution is a serious environmental problem, and a large amount of engine emissions is one of the important causes of air pollution. In recent years, in order to protect the environment, countries around the world have put forward stricter restrictions on the composition of engine fuel in order to reduce the emission of harmful substances. Among them, the restrictions on the sulfur content in gasoline are particularly severe. The United States requires that the sulfur content in motor gasoline be less than 30 μg / g in 2006. In 2005, the European Union began to implement gasoline specifications corresponding to Euro IV vehicle emission standards, requiring the sulfur content in gasoline to be les...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G67/16
Inventor 屈锦华毛俊义高晓冬习远兵李明丰褚阳聂红孟勇新
Owner CHINA PETROLEUM & CHEM CORP
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