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Gasoline desulfurization method

A technology for gasoline and gasoline fractions, which is applied in the petroleum industry, processing hydrocarbon oil, etc., can solve the problems of complicated operation of desulfurization method, difficult to achieve deep desulfurization and reduction of octane number loss at the same time, etc.

Active Publication Date: 2015-12-16
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The invention provides a gasoline desulfurization method, which is used to solve the technical defects of the desulfurization method in the prior art, such as complex operation and difficulty in simultaneously achieving deep desulfurization and reducing octane loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] 1. Preparation of selective hydrodesulfurization catalyst

[0066] CoSO first 4 The solution impregnates the ZSM-5 molecular sieve (carrier) with an equal volume, and after washing, drying and roasting, the (NH 4 ) 6 Mo 7 o 24 . 4H 2 O aqueous solution on the impregnated CoSO 4 The ZSM-5 type molecular sieve in the solution is impregnated with equal volume, and after washing, drying and roasting, a selective hydrogenation desulfurization catalyst is prepared.

[0067] The total specific surface area of ​​the selective hydrodesulfurization catalyst prepared above is 168m 2 / g, the total pore volume is about 0.378mL / g, the loading amount of Co on the carrier is about 7%, the loading amount of Mo on the carrier is about 10%, and the mass ratio of Co and Mo loaded on the carrier is 0.7 :1.

[0068] 2. Gasoline desulfurization

[0069] Using the gasoline fraction with a boiling range of 40-100°C as the raw material (see Table 1 for its composition), the process flo...

Embodiment 2

[0086] This embodiment is improved on the basis of embodiment 1, and its technological process is as follows figure 2 As shown, the difference is:

[0087] In liquid-liquid extraction, the organic solvent used is tetraethylene glycol, and the C5 alkane used is n-pentane; the temperature at the top of the extraction tower is controlled at 80°C, the temperature at the bottom of the tower is 60°C, and the absolute pressure at the top of the tower is 0.2MPa , the feed ratio of the organic solvent to the raffinate is 2.0, and the feed ratio of C5 alkane to the raffinate is 0.2; the absolute pressure of the extractive distillation tower is controlled to be 0.2MPa, and the temperature at the bottom of the extractive distillation tower is 180° C.; The absolute pressure of the recovery tower is 0.025MPa, and the bottom temperature of the recovery tower is 150°C.

[0088] In addition, the hydrogenated desulfurized gasoline fraction formed by selective hydrodesulfurization is further s...

Embodiment 3

[0094] 1. Preparation of selective hydrodesulfurization catalyst

[0095] Prepare the selective hydrodesulfurization catalyst according to the method of Example 1, the difference is that the loading of Co on the carrier is controlled to be about 4%, the loading of Mo on the carrier is about 10%, and the Co and Mo loaded on the carrier are The mass ratio is 0.4:1.

[0096] 2. Gasoline desulfurization

[0097] Using the gasoline fraction with a boiling range of 40-130°C as the raw material (see Table 2 for its composition), the process flow for desulfurizing the gasoline raw material is as follows: image 3 shown.

[0098] 2.1 Extractive distillation

[0099] The above-mentioned gasoline fraction enters from the middle and lower part of the extractive distillation tower, and the organic solvent enters from the upper part of the extractive distillation tower, and the gasoline fraction and the organic solvent are contacted through multi-stage countercurrent in the extractive di...

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Abstract

The invention provides a gasoline desulfurization method which comprises the following steps: performing extractive distillation on gasoline fractions, so as to obtain extraction residues containing olefin and extractives containing sulfides and arene; performing desulfuration treatment on the extractives, so as to obtain desulfurized gasoline fractions and sulfur-rich gasoline fractions, wherein the desulfuration treatment is liquid-liquid extraction or adsorption desulfuration; separating organic solvents in the extractives, so as to obtain extract oil containing sulfides and arene. Through the adoption of the gasoline desulfurization method, the deep desulfurization can be realized, the octane value loss of gasoline products can be remarkably reduced, the desulfuration load can be greatly reduced, and the product yield is greater than 95%.

Description

technical field [0001] The invention belongs to the technical field of petrochemical industry, and in particular relates to a gasoline desulfurization method. Background technique [0002] As people pay more and more attention to environmental protection, the new environmental protection regulations of various countries in the world have stricter requirements on the quality of gasoline. For example, my country's national V motor gasoline standard that will be implemented on January 1, 2017 will require the olefin content to be below 25%, and the sulfur content to be below 10ppm; ); Europe requires that the sulfur content of gasoline should be lower than 50ppm (Euro IV emission standard). Therefore, it is necessary to carry out deep desulfurization of gasoline to meet the relevant requirements. [0003] Adsorption desulfurization has little effect on the octane number of gasoline products while removing sulfide in gasoline raw materials, so it is one of the more potential de...

Claims

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Application Information

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IPC IPC(8): C10G53/00
Inventor 高金森赵亮郝天臻韩晓娜李海争蓝兴英王成秀
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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