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A combined method of heavy oil separation-hydrotreating-catalytic cracking

A technology of catalytic cracking and combined methods, which is applied in the fields of hydrotreating process, hydrocarbon oil treatment, petroleum industry, etc., can solve the problems of low specific gravity of hydrogenated heavy oil, increase of gas yield, decrease of light oil yield, etc., and achieve improvement Utilization rate, elimination of mutual influence, effect of saving oil resources

Active Publication Date: 2018-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • 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 separation-hydrotreating-catalytic cracking
  • A combined method of heavy oil separation-hydrotreating-catalytic cracking
  • A combined method of heavy oil separation-hydrotreating-catalytic cracking

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Experimental program
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Effect test

Embodiment approach

[0056] The second specific embodiment of the present invention is as figure 2 Shown:

[0057] After the heavy oil is separated and treated, S component, A1 component, A2 component and A3 component are obtained, and the obtained S component and A1 component are respectively subjected to the first catalytic cracking reaction and the second catalytic cracking reaction to obtain dry Gas, liquefied gas, gasoline, diesel, coke and cracked heavy oil; the obtained A3 component is subjected to a hydrotreating reaction, and the obtained hydrogenated oil and the A2 component are subjected to a third catalytic cracking reaction to obtain dry gas, liquefied gas, Gasoline, diesel, coke and cracked heavy oil; the obtained diesel and cracked heavy oil are subjected to hydrotreating reaction to obtain hydrogenated oil. At the same time, the hydrocracking tail oil and the S component can be mixed together to perform the first catalytic cracking reaction.

[0058] The present invention will b...

Embodiment 1

[0065]This example is used to illustrate the implementation method of the heavy oil separation unit in the heavy oil separation-hydroprocessing-catalytic cracking combined method 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, pore volume is 0.213 milliliters / gram), the aluminum oxide (massfraction of silver is 7.05 mass %, adopts silver nitrate impregnation method to prepare) of 110g load silver ions in the middle of filling, upper layer fills 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 distillate oil (VGO, Tahe crude oil is taken from the Tahe Oilfield of Sinopec Northwest Branch Company, and obtain Tahe vacuum wax oil through true boiling point distillation at the Research Ins...

Embodiment 2

[0067] Such as figure 1 As shown, the S component, A1 component and A2 component obtained in Example 1 were reacted at a reaction temperature of 500°C, an agent-to-oil mass ratio of 4, and a space velocity of 16 hours -1 The first catalytic cracking, the second catalytic cracking and the third catalytic cracking are respectively carried out under the conditions; the obtained A3 component is subjected to hydrogenation treatment in a precision high-pressure reactor, and the obtained initial boiling point is 160 ° C. Hydrogenated oil ( HT-A3, the composition of the hydrocarbon group is shown in Table 2), at a reaction temperature of 500°C, an agent-oil mass ratio of 4, and a space velocity of 16 hours -1 Carry out the fourth catalytic cracking under certain conditions; all the catalytic cracked diesel oil and catalytic cracked heavy oil obtained from the first catalytic cracking, second catalytic cracking, third catalytic cracking and fourth catalytic cracking are returned to hyd...

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Abstract

The invention discloses a heavy oil separation-hydrotreatment-catalytic cracking combined method. the method comprises the following steps: a, separating heavy oil to obtain a component S, a component A1, a component A2 and a component A3; and b, carrying out a first catalytic cracking reaction on the component S obtained in the step a, so as to obtain dry gas, liquefied gas, gasoline, diesel oil, coke and cracked heavy oil; carrying out a second catalytic cracking reaction on the component A1 obtained in the step a, so as to obtain dry gas, liquefied gas, gasoline, diesel oil, coke and cracked heavy oil; carrying out a third catalytic cracking reaction on the component A2 obtained in the step a, so as to obtain dry gas, liquefied gas, gasoline, diesel oil, coke and cracked heavy oil; and carrying out a hydrotreatment reaction on the component A3 obtained in the step a under the action of a hydrotreating catalyst, so as to obtain hydrogenated oil. In comparison with the prior art, the method for heavy oil treatment and the subsequent catalytic cracking reactions has advantages of higher yield of gasoline and liquefied gas and lower sulfur / nitrogen content of gasoline.

Description

technical field [0001] The invention relates to a combined method of heavy oil separation-hydrotreating-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 di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G55/00C10G69/00
Inventor 赵丽萍田松柏龙军刘泽龙
Owner CHINA PETROLEUM & CHEM CORP
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