A combined method of heavy oil pretreatment and catalytic cracking

A catalytic cracking and combined method technology, which is applied in the direction of hydrocarbon oil treatment, hydroprocessing process, only multi-stage series refining and cracking process treatment, etc., can solve the problem of low specific gravity of hydrogenated heavy oil, decreased yield of light oil, gas Improve the utilization rate, eliminate mutual influence, and save oil resources

Active Publication Date: 2018-05-25
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods directly mix poor-quality catalytically cracked heavy oil and catalytically cracked diesel oil with waxy oil raw materials containing a large amount of saturated hydrocarbons. The saturated hydrocarbons in waxy oils are easy to crack due to the action of acid centers on the catalyst during hydrotreating. light hydrocarbons, resulting in an increase in gas yield, and at the same time, the hydrogenated heavy oil produced has a lower specific gravity, and the yield of light oil decreases when it is used as the feed of the catalytic cracking unit

Method used

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  • A combined method of heavy oil pretreatment and catalytic cracking
  • A combined method of heavy oil pretreatment and catalytic cracking
  • A combined method of heavy oil pretreatment and catalytic cracking

Examples

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Embodiment approach

[0061] The second specific embodiment of the present invention is as figure 2 Shown:

[0062] After the heavy oil is separated and treated, the S component and the AR component are obtained, and the obtained S component is subjected to the first catalytic cracking reaction to obtain dry gas, liquefied gas, gasoline, diesel oil, coke and cracked heavy oil; the obtained AR component is The hydroprocessing reaction is carried out, and the obtained hydrogenated oil is subjected to the third catalytic cracking reaction to obtain dry gas, liquefied gas, gasoline, diesel oil, coke and cracked heavy oil; the obtained diesel oil and cracked heavy oil are subjected to hydroprocessing reaction to obtain hydrogenated Hydrogen produces oil. At the same time, the hydrocracking tail oil and the S component can be mixed together to perform the first catalytic cracking reaction.

[0063] The third specific embodiment of the present invention is as image 3 Shown: S component and AR compone...

Embodiment 1

[0071] This example is used to illustrate the implementation method of heavy oil separation treatment in the combined method of heavy oil pretreatment and catalytic cracking provided by the present invention. Fill the bottom of the separation column with 30g of neutral alumina (the specific surface area is 152m 2 / gram, the pore volume is 0.213 milliliters / gram), the aluminum oxide (the massfraction of silver is 7.05 mass %, adopts silver nitrate impregnation method to prepare) of 110g loading silver in the middle of filling, upper layer filling 30g silica gel (specific surface area is 479 meters 2 / gram, the pore volume is 0.349 milliliters / gram); The lower end of the separation column is connected with the vacuum system. The total volume of the stationary phase was 150 mL. Take vacuum gas oil (VGO, Tahe crude oil is taken from the Tahe Oilfield of Sinopec Northwest Branch Company, and obtain Tahe vacuum gas oil through true boiling point distillation at the Research Institu...

Embodiment 2

[0073] Such as figure 1 As shown, the S component and AR component obtained in Example 1 are respectively used as catalytic cracking raw materials, and the reaction temperature is 500 ° C, the agent-oil mass ratio is 4, and the space velocity is 16 hours -1 The first catalytic cracking reaction and the second catalytic cracking reaction are carried out under certain conditions, the conversion rate, total liquid yield, light oil yield, and six main products dry gas, liquefied gas, gasoline, diesel oil, cracked heavy oil and coke The yield, sulfur content and nitrogen content in gasoline are shown in Table 4.

[0074]From the data in Table 4, it can be seen that compared with the experimental results of VGO direct catalytic cracking, after summarizing the liquefied petroleum gas and gasoline obtained by catalytic cracking of S and AR components respectively, the yields of liquefied petroleum gas and gasoline are respectively higher than 1 The liquefied gas and gasoline yields o...

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Abstract

The invention discloses a heavy oil pretreatment and catalytic cracking combination method. The method comprises the following steps: a) separating the heavy oil to obtain a component S and a component AR; wherein, by taking total mass of the component S as a reference, the mass fraction of saturated hydrocarbon in the component S is greater than 90 mass%; by taking the total mass of the component AR as the reference, the sum of the mass fraction of the aromatic hydrocarbons and the mass fraction of the colloid in the component AR is greater than 90 mass%, the mass fraction of the aromatic hydrocarbon is greater than 50 mass%; and b) performing a first catalytic cracking reaction on the component S in the step a) to obtain dry gas, liquefied gas, gasoline, diesel oil, coke and cracking heavy oil. Compared with the prior art, after the method used for heavy oil processing and then the catalytic cracking reaction, gasoline and liquefied gas yield is higher, and the gasoline sulfur nitrogen content is lower.

Description

technical field [0001] The invention relates to a combined method of heavy oil pretreatment and catalytic cracking. Background technique [0002] Catalytic cracking technology is the most important secondary processing method for lightening heavy oil, an important production process for light oil products such as liquefied petroleum gas, gasoline, diesel, and a processing process for continuously improving the conversion capacity of heavy oil. The process of target product selection. [0003] At present, the raw materials from the atmospheric and vacuum unit entering the heavy oil catalytic cracking unit are not differentiated in terms of fraction composition and reaction performance. They are all mixed together in the form of blending and sent to the catalytic cracking unit. The conversion is carried out in the reactor and under the same process conditions, and no optimization measures are taken according to the differences in the reactivity of hydrocarbons with different ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G55/06C10G69/04
Inventor 赵丽萍田松柏龙军刘泽龙
Owner CHINA PETROLEUM & CHEM CORP
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