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Method for producing low-sulfur gasoline

A gasoline and light gasoline technology, applied in the petroleum industry, processing hydrocarbon oil, hydrotreating process, etc., can solve the problem of product octane loss and other issues

Active Publication Date: 2012-07-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when traditional catalysts and processes are used for hydrodesulfurization, the large-scale hydrogenation of olefins will cause a large loss of octane number of the product

Method used

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  • Method for producing low-sulfur gasoline
  • Method for producing low-sulfur gasoline
  • Method for producing low-sulfur gasoline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Produce low-sulfur gasoline according to the process shown in Figure 1.

[0054] Gasoline raw material oil is catalytic cracking full distillate gasoline, and its properties are shown in Table 1. Light gasoline fraction and heavy gasoline fraction are obtained by fractional distillation, and the cut point is 65°C. The properties of light gasoline fraction and heavy gasoline fraction are listed in Table 1.

[0055] The distillate of light gasoline is put into the alkali washing tower to remove mercaptan. The operating conditions are: extraction temperature 30°C, pressure 0.4MPa, lye concentration 15%, oil-alkali volume ratio 10:1.

[0056] The mixed raw material C of heavy gasoline fraction and heavy distillate oil is put into the primary hydrodesulfurization reactor for desulfurization. The properties of mixed raw material C are listed in Table 1. After hydrodesulfurization, the heavy gasoline fraction enters the secondary desulfurization reactor for desulfurization. C...

Embodiment 2

[0061] In the process shown in Figure 1, the flash tower 8 is omitted, and low-sulfur gasoline is produced according to this process.

[0062] The gasoline stock oil is the same as in Example 1, and its properties are shown in Table 1. Light gasoline fraction and heavy gasoline fraction are obtained by fractional distillation, and the cut point is 65°C. The properties of light gasoline fraction and heavy gasoline fraction are listed in Table 1.

[0063] The distillate of light gasoline is put into the alkali washing tower to remove mercaptan. The operating conditions are: extraction temperature 30°C, pressure 0.4MPa, lye concentration 15%, oil-alkali volume ratio 10:1.

[0064] The heavy gasoline distillate oil enters the primary hydrodesulfurization reactor for hydrodesulfurization reaction, and the properties of the heavy gasoline distillate oil are listed in Table 1. After hydrodesulfurization, the heavy gasoline fraction enters the secondary desulfurization reactor for d...

Embodiment 3

[0068] Produce low-sulfur gasoline according to the process shown in Figure 1.

[0069] Except that the conditions of the first desulfurization reaction and the second desulfurization reaction are different from those in Example 1, the others are the same as in Example 1.

[0070] The primary desulfurization reaction conditions are: the reaction temperature is 250°C, the reaction pressure is 1.6MPa, and the gasoline feed volume space velocity is 3h -1 , gasoline feed hydrogen oil volume ratio is 400. The properties of the gasoline fraction after hydrodesulfurization are listed in Table 2.

[0071] The secondary desulfurization reaction conditions are: the pressure is 1.3MPa, the average temperature of the catalyst bed below the feed is 230°C, and the mass space velocity of the feed is 3h -1 , The volume ratio of steam (inert gas) to raw oil is 30. The properties of gasoline product S3 are listed in Table 3.

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Abstract

The invention discloses a method for producing low-sulfur gasoline. The method comprises the following steps of: (1) cutting a gasoline raw material into a light gasoline fraction and a heavy gasoline fraction, wherein the cutting point of the light gasoline fraction and the heavy gasoline fraction is 50-100DEG C; (2) performing alkali washing on the light gasoline fraction for desulfurization to obtain the desulfurized light gasoline fraction; (3) in the presence of hydrogen and a catalyst A, performing primary desulfurization reaction on the heavy gasoline fraction, and separating to obtain the hydrogenated and desulfurized heavy gasoline fraction; (4) in the presence of inert gas and a catalyst B, preforming secondary desulfurization reaction on the hydrogenated and desulfurized heavy gasoline fraction, and separating to obtain low-sulfur heavy oil fraction; and (5) mixing the light gasoline fraction obtained in the step (2) and the heavy gasoline fraction obtained in the step (4) to obtain a gasoline product. Compared with the prior art, the method has the advantages that: the gasoline produced by the method has low sulfur content and low olefin saturation rate and the method has high desulfurization selectivity.

Description

technical field [0001] The invention relates to a method for producing low-sulfur gasoline. 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. [0003] At present, 90% to 99% of the sulfur in my country's finished gasoline comes from FCC gasoline. Therefore, reducing the sulfur content of FCC gasoline is the key to reducing the sulfur content of finished gasoline. [0004] Hydrogenation pretreatment of catalytic cracking feedstock (pre-hydrogenation) or hydrodesulfurization of catalytic cracked gasoline (post-hydrogenation) are two alternative technical solutions for reducing the sulfur content of catalytic cracking gasoline. Among them, the pretreatmen...

Claims

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Application Information

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IPC IPC(8): C10G67/00
Inventor 李明丰褚阳毛俊义刘锋朱玫王奎聂红
Owner CHINA PETROLEUM & CHEM CORP
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