Coupling method of catalytic cracking gasoline desulfurization

A technology for catalytic cracking of gasoline and gasoline, which is applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc. It can solve problems such as the difficulty in achieving deep desulfurization at the same time, the loss of octane number, and the complicated operation of the desulfurization method, so as to avoid octane number Loss, reduce desulfurization load, meet the effect of deep desulfurization

Active Publication Date: 2016-02-03
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
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Problems solved by technology

[0012] The invention provides a coupling method for catalytic cracking gasoline desulfurization, which is used to solve technical defects such as compl

Method used

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  • Coupling method of catalytic cracking gasoline desulfurization
  • Coupling method of catalytic cracking gasoline desulfurization
  • Coupling method of catalytic cracking gasoline desulfurization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] 1. Preparation of selective hydrodesulfurization catalyst

[0074] 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.

[0075] 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.

[0076] 2. Gasoline desulfurization

[0077] Using catalytic gasoline produced by Daqing atmospheric heavy oil through catalytic cracking as raw material (see Table 1 for its comp...

Embodiment 2

[0097] This embodiment is improved on the basis of Embodiment 1, where the difference is:

[0098] The raffinate oil and sweetened light fraction of Example 1 are combined into mixed oil, and then the mixed oil is subjected to adsorption desulfurization to obtain adsorption desulfurized oil and sulfur-rich oil, and then the sulfur-rich oil is combined with the extracted oil and extracted oil of Example 1 After combined with the heavy fraction, selective hydrodesulfurization is carried out to obtain the desulfurized heavy fraction. The process flow is as follows figure 2 shown.

[0099]The desulfurization adsorbent is used for the above-mentioned adsorption desulfurization. The desulfurization adsorbent is obtained by carrying the active metal components on the ZSM-5 molecular sieve and activated carbon that have been treated with alkali respectively; the mass ratio of the molecular sieve to the activated carbon is 1:1, and the active metal For K and Ni, the loading of K on t...

Embodiment 3

[0104] In addition to extractive distillation, the theoretical plate number of the extractive distillation tower is 25, the temperature at the top of the tower is about 80°C, the temperature at the bottom of the tower is about 145°C, and the absolute pressure at the top of the tower is about 0.2MPa. The material ratio is about 0.6, and the separation degree of olefins and aromatics in the extractive distillation tower reaches about 80% at this time;

[0105] In adsorption desulfurization, the life of the desulfurization adsorbent is 3.4h, and the adsorption desulfurization efficiency reaches about 87%. The rest are the same as in Example 2 to obtain desulfurized gasoline with a yield of 93%. The composition is shown in Table 1.

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Abstract

The invention provides a coupling method of catalytic cracking gasoline desulfurization. The coupling method comprises the following steps: cutting gasoline raw materials into light fractions, medium fractions and heavy fractions; carrying out extractive distillation on the medium fractions by an organic solvent to obtain olefin-contained raffinate and extracts which contain sulfide and arene; separating the organic solvent in the extracts to obtain extraction oil; carrying out selective hydrodesulfurization on the extraction oil and the heavy fractions to obtain the desulfurization heavy fractions; mixing the light fractions, the raffinate and the desulfurization heavy fractions to obtain desulfurization gasoline, wherein the cutting temperature of the light fractions and the medium fractions is 35 to 60DEG C, and the cutting temperature of the medium fractions and the heavy fractions is 140 to 160DEG C. According to the coupling method of the gasoline desulfurization, the octane value loss of a gasoline product can be obviously reduced, and desulfurization load is drastically lowered while deep desulfurization is realized. The yield of the product is greater than 95%.

Description

technical field [0001] The invention relates to a gasoline desulfurization method, in particular to a coupling method for catalytic cracking gasoline desulfurization. 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] Hydrodesulfurization is the most effective method for removing sulfur compounds from gasoline. Among them, the FCC gasoline selective hydrodesulfurization process (R...

Claims

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Application Information

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IPC IPC(8): C10G67/04
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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