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Method for extracting and separating aromatic hydrocarbon and saturated hydrocarbon in catalytic cracking slurry oil

A technology for catalytic cracking of oil slurry and aromatic hydrocarbons is applied in the direction of multi-stage series-connected refining process treatment, etc., and can solve the problems of increasing the scale and processing capacity of the extraction device, adding a large amount of the second solvent, and increasing the cost input, etc. To achieve the effect of reducing processing capacity and operation difficulty, reducing consumption and saving costs

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

However, the above studies are mainly aimed at the re-refined oil and oil slurry of FCC, and less consideration is given to the FCC external oil slurry, and the current dual-solvent extraction process has a large amount of second solvent added, which virtually increases the cost of the extraction device. The scale and processing capacity have increased the initial equipment investment and the cost input in the processing process

Method used

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  • Method for extracting and separating aromatic hydrocarbon and saturated hydrocarbon in catalytic cracking slurry oil
  • Method for extracting and separating aromatic hydrocarbon and saturated hydrocarbon in catalytic cracking slurry oil
  • Method for extracting and separating aromatic hydrocarbon and saturated hydrocarbon in catalytic cracking slurry oil

Examples

Experimental program
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Effect test

example 1

[0027] The catalytic cracking oil slurry A was taken as the separation object, and its properties are shown in Table 1.

[0028] At 60°C, add 100g of FCC oil slurry A, 150g of furfural, and 150g of n-octane into a separatory funnel, oscillate fully to mix evenly, and stand to separate into layers to obtain a raffinate phase and an extraction phase. Add 150g of n-octane to the extracted phase to simulate the operation of the second solvent entering the lower part of the first extraction tower, and the obtained n-octane layer is combined with the raffinate phase extracted for the first time to obtain a mixed raffinate phase. 300g of furfural was added therein for the second extraction operation; the obtained raffinate was then extracted with 300g of furfural for the third and fourth times respectively.

[0029] The raffinate after the fourth extraction was concentrated, and 250 g of n-octane was recovered by distillation under reduced pressure, and the quality of the raffinate w...

example 2

[0031] FCC oil slurry B is extracted and separated by the method of example 1, and the properties of FCC oil slurry B are shown in Table 1. Finally obtained raffinate oil 24.7g, its properties are shown in Table 2, and extracted oil 75.1g, its properties are shown in Table 3.

example 3

[0033] FCC oil slurry A is extracted and separated by the method of Example 1, except that the second solvent is changed from n-octane to n-heptane. Obtain raffinate oil 34.3g at last, its properties are shown in Table 2, and extracted oil 65.6g, its properties are shown in Table 3.

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Abstract

A method for extracting and separating aromatic hydrocarbons and saturated hydrocarbons in catalytic cracking slurry oil comprises two-stage extraction and separation of aromatic hydrocarbons and saturated hydrocarbons in catalytic cracking slurry oil; the first-stage extraction adopts two solvents, wherein the first solvents are furfural, sulfolane, sulfoxide, N-methyl pyrrolidone or amide, and the second solvents are light oil, C6-C10 n-alkane or C6-C10 cycloalkane; before the second-stage extraction, the second solvents in raffinate oil obtained in the first-stage extraction are separated from the raffinate oil; the concentrated raffinate oil is treated by second-stage extraction by the first solvents, and the aromatic hydrocarbons and saturated hydrocarbons are further separated. The method can reduce the solvent using amount, and improve the extraction efficiency.

Description

technical field [0001] The invention is a method for separating hydrocarbon components, in particular, a method for separating aromatic hydrocarbons and saturated hydrocarbons from hydrocarbon components by solvent extraction. Background technique [0002] Fluid catalytic cracking (FCC) is one of the important refining processes of heavy oil to light oil, and plays an important role in the production of light oil products such as gasoline and diesel. [0003] With the increasing weight of catalytic cracking feed and the increase in the proportion of blended residual oil, the processing difficulty of the FCC unit is also increasing, especially the coking and fouling will affect the stable operation of the unit. In order to reduce catalyst carbon deposition, maintain the heat balance of the unit, and improve product distribution and quality, FCC units throw out part of the oil slurry to varying degrees, and the thrown out amount accounts for 5-12% by mass of the raw oil. The ...

Claims

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Application Information

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IPC IPC(8): C10G53/06
Inventor 史军军葸雷果卉马秀艳
Owner CHINA PETROLEUM & CHEM CORP
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