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A combined method for producing ultra-low sulfur gasoline

A combined method and ultra-low sulfur technology, applied in the petroleum industry, hydrocarbon oil treatment, hydrotreating process, etc., can solve the problems of difficulty in simultaneously achieving deep desulfurization to reduce octane number loss, complicated operation of desulfurization methods, etc. Loss of octane number, reducing desulfurization load, and satisfying the effect of deep desulfurization

Active Publication Date: 2017-04-26
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The invention provides a combined method for producing ultra-low sulfur gasoline, which is used to solve the technical defects of the desulfurization method in the prior art, such as complex operation and difficulty in simultaneously realizing deep desulfurization and reducing octane loss.

Method used

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  • A combined method for producing ultra-low sulfur gasoline
  • A combined method for producing ultra-low sulfur gasoline
  • A combined method for producing ultra-low sulfur gasoline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] 1. Preparation of selective hydrodesulfurization catalyst

[0095] 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.

[0096] 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.

[0097] 2. Gasoline desulfurization

[0098] Using catalytic gasoline produced by Daqing atmospheric heavy oil through catalytic cracking as raw material (see Table 1 for its c...

Embodiment 2

[0124] This embodiment is improved on the basis of Embodiment 1, where the difference is:

[0125] The sweetened light fraction, middle fraction raffinate and heavy fraction raffinate of Example 1 were combined into a mixed oil, and then the mixed oil was subjected to adsorption desulfurization to obtain adsorption desulfurized oil and sulfur-rich oil, and then the sulfur-rich oil was combined with the The extracted oil, middle distillate extracted oil and heavy distillate extracted oil of Example 1 are combined and then selectively hydrodesulfurized to obtain a desulfurized fraction. The process flow is as follows figure 2 shown.

[0126] 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, a...

Embodiment 3

[0131] In addition to extractive distillation, the theoretical plate number of the extractive distillation tower is 25, the temperature of the top of the extractive distillation tower is about 80°C, the temperature of the bottom of the tower is about 150°C, and the absolute pressure of the top of the tower is about 0.2MPa. The material ratio is about 0.4, and the separation degree of olefins and aromatics in the extractive distillation tower reaches about 80% at this time;

[0132] In adsorption desulfurization, the service life of the desulfurization adsorbent is 3.5h, and the adsorption desulfurization efficiency reaches about 85%. The rest are the same as in Example 2 to obtain desulfurized gasoline with a yield of 86%. The composition is shown in Table 1.

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Abstract

The invention provides a combination method for producing ultralow sulphur gasoline. The combination method includes the following steps that gasoline raw materials are cut into light fractions, medium fractions and heavy fractions; the medium fractions are subjected to liquid-liquid extraction, and olefin-containing medium-fraction raffinate and sulfide-and-arene-containing medium-fraction extract oil are obtained; the heavy fractions are extracted and distilled, and olefin-containing heavy-fraction raffinate and sulfide-and-arene-containing heavy-fraction extract oil are obtained; selective hydrogen desulfurization is carried out on the medium-fraction extract oil and the heavy-fraction extract oil, and desulfurized fractions are obtained; the light fractions, the medium-fraction raffinate, the heavy-fraction raffinate and the desulfurized fractions are mixed, and the desulfurized gasoline is obtained. The cutting temperature of the light fractions and the medium fractions ranges from 35 DEG C to 50 DEG C, and the cutting temperature of the medium fractions and the heavy fractions ranges from 80 DEG C to 110 DEG C. By means of the combination method, deep desulfurization is achieved; meanwhile, losses of the octane value of gasoline products can be remarkably reduced, desulfurization loads can be greatly reduced, and the product yield is higher than 95%.

Description

technical field [0001] The invention relates to a gasoline desulfurization method, in particular to a combined method for producing ultra-low sulfur gasoline. 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 (RSDS-I) d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G67/00
Inventor 赵亮高金森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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