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Catalytic conversion method for preparing ethylene, propylene and butylene

A catalytic conversion and catalytic cracking technology, which is applied in organic chemistry, hydrocarbon cracking to produce hydrocarbons, and hydrocarbon oil treatment, can solve the problems of low reaction selectivity, flexible adjustment, and small ethylene/propylene, so as to improve utilization rate and realize recovery Effects of utilization and productivity improvement

Active Publication Date: 2022-07-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method focuses on recycling the C4 fraction, which improves the conversion rate of olefins, and the obtained ethylene and propylene are not less than 62% of the total amount of raw olefins, but the ethylene / propylene ratio is small, which cannot be flexibly adjusted according to market demand, and the reaction selectivity is low.

Method used

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  • Catalytic conversion method for preparing ethylene, propylene and butylene
  • Catalytic conversion method for preparing ethylene, propylene and butylene
  • Catalytic conversion method for preparing ethylene, propylene and butylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] see figure 1 The procedure shown was tested on a mid-scale unit of a riser reactor.

[0145] The 1-pentene and the high temperature catalytic conversion catalyst I are contacted at the bottom of the first reaction zone, and the catalysis occurs under the conditions that the reaction temperature is 700 ° C, the reaction pressure is 0.1 MPa, the reaction time is 5 seconds, and the weight ratio of the catalyst to the raw material is 45:1. conversion reaction;

[0146] The heavy oil I is contacted with the stream from the first reaction zone at the bottom of the second reaction zone, and the heavy oil I and the catalytic conversion catalyst i are at a reaction temperature of 530 ° C, a reaction pressure of 0.1 MPa, a reaction time of 6 seconds, and the weight ratio of the catalyst to the raw material. Catalytic conversion reaction occurs under the condition of 5:1, and the weight ratio of 1-pentene to heavy oil I is 1:9.

[0147] The reaction product of the reaction and t...

Embodiment 2

[0152] see figure 1 The procedure shown, was tested on a mid-scale unit of a riser reactor.

[0153] The heavy oil I and the catalytic conversion catalyst I are contacted at the bottom of the second reaction zone, the reaction temperature is 530 ° C, the reaction pressure is 0.1 MPa, the reaction time is 6 seconds, and the catalytic conversion reaction occurs under the weight ratio of the catalyst to the raw material 5:1, and the reaction is separated. The reaction product and the to-be-generated catalyst are introduced into the regenerator together for coke regeneration, and the obtained reaction product is introduced into the combined separation system together to obtain a stream comprising ethylene, propylene, butene, olefin-rich streams and a stream with a boiling point greater than 250°C. The second catalytic cracking distillate oil and other products, the second catalytic cracking distillate oil and the hydrogenation catalyst IV are at 350 ° C, the hydrogen partial press...

Embodiment 3

[0157] Basically the same as Example 2, except that heavy oil II is used. The second catalytically cracked distillate oil with a boiling point greater than 250℃ is not subjected to deep hydrotreating, and is contacted with the hydrodesulfurization catalyst ⅴ in the hydrodesulfurization reactor. , volume airspeed 2.0 hours -1 The low-sulfur hydrocatalytically cracked distillate oil is obtained as a light oil component. The reaction conditions and product distribution are listed in Table 3.

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Abstract

The invention relates to a catalytic conversion method for preparing ethylene, propylene and butylene. The method comprises the following steps: carrying out catalytic cracking on an olefin-rich raw material in a first reaction zone of a catalytic conversion reactor, contacting a mixed material flow in the first reaction zone with a heavy raw material in a second reaction zone, carrying out a catalytic cracking reaction, and carrying out first separation treatment and second separation treatment on a reaction product, the obtained material flow rich in olefin can be used for catalytic cracking again, and the oil-olefin-containing material in the reaction product is used for further producing ethylene, propylene and butylene, so that the utilization rate of petrochemical resources is increased; according to the invention, heavy raw materials are introduced into a production process, so that recycling of heavy oil is realized, and the cost is reduced; the catalytic conversion method for preparing ethylene, propylene and butylene provided by the invention has high yield and selectivity of ethylene, propylene and butylene, can reduce the generation of hydrogen, methane and ethane, and especially can inhibit the generation of methane.

Description

technical field [0001] The present application relates to petroleum refining and petrochemical processing, in particular to a catalytic conversion method for preparing ethylene, propylene and butene. Background technique [0002] Olefins with four carbon atoms or less are important chemical raw materials, and typical products include: ethylene, propylene and butene. On the one hand, with the accelerating economic development, the demand for light oil and clean fuel oil from all walks of life has also grown rapidly. On the other hand, with the continuous increase of oilfield production, the available production of conventional crude oil is decreasing, and the quality of crude oil is getting worse and worse, tending to be inferior and heavier. Although the production capacity of light olefins in my country is growing rapidly, but At present, it still cannot meet the domestic market's demand for light olefins. [0003] Among them, the main products produced with ethylene inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G69/00C07C4/06C07C11/04C07C11/06C07C11/08
CPCC10G69/00C07C4/06C10G2400/20C10G2300/1037C07C11/04C07C11/06C07C11/08Y02P20/52
Inventor 许友好左严芬王新何鸣元沙有鑫白旭辉
Owner CHINA PETROLEUM & CHEM CORP
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