Method for preparing low carbon olefin by coupled catalytic cracking of petroleum hydrocarbon

A technology of catalytic cracking and low-carbon olefins, applied in the field of coupled catalytic cracking of petroleum hydrocarbons, can solve problems such as complex equipment and high energy consumption, and achieve the effects of improving utilization, reducing energy consumption, and easy to control reactions

Inactive Publication Date: 2005-06-15
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to propose a coupled catalytic cracking of petroleum hydrocarbons to produce low The method of carbon olefins can effectively convert petroleum hydrocarbons to produce ethylene, propylene and other low-carbon olefins at a relatively low temperature using a solid acid catalyst, wherein the total yield of ethylene + propylene can reach 40-50%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0031] Examples 1-3 illustrate the reaction effect of producing light olefins by catalytic cracking of heavy oil coupled with methanol.

[0032] Catalyzed cracking was carried out on a small-scale fixed fluidized bed (equipment identical to Comparative Example 1-3) with a catalyst loading of 200 grams using Daqing atmospheric residue (reaction raw material the same as Comparative Example 1-3) and methanol as raw materials. Table 6 is the physical and chemical properties of raw methanol in the examples. Table 7 shows the yield of main products and the decrease of reactor bed temperature in heavy oil catalytic cracking coupled with methanol. The composition yield of each product is the ratio of the mass of each product collected after the reaction to the mass of the feed atmospheric residue plus the theoretical amount of methanol fully converted to ethylene. The reaction temperature drop is the maximum drop in temperature of the catalyst bed during the reaction.

[0033] ...

Embodiment 4

[0036] This example illustrates the reaction effect of catalytic cracking of light gasoline coupled with methanol to produce light olefins.

[0037] The catalytic cracking light gasoline (fraction -1 , Catalyst: atmospheric residue oil weight ratio is 20:1, water: atmospheric pressure residue oil weight ratio is 0.7:1, methanol: atmospheric pressure residue oil weight ratio is 0.4:1. Table 8 shows the main product yield and reactor bed temperature decrease °C after catalytic cracking. The composition yield of each product is the ratio of the mass of each product collected after the reaction to the mass of the feed atmospheric residue plus the theoretical amount of methanol fully converted to ethylene. The reaction temperature drop is the maximum drop in temperature of the catalyst bed during the reaction.

[0038] composition

Embodiment 5

[0040] This example illustrates the reaction effect of heavy oil catalytic cracking coupled with dimethyl ether / methanol to produce light olefins.

[0041] With Daqing atmospheric residue (reaction raw material is the same as comparative example 1) and dimethyl ether / methanol mixture as raw material, carry out on the small-scale fixed fluidized bed (equipment identical with comparative example 1-3) that catalyst loading is 200 grams Catalytic cracking reaction. Catalyst A is used for coupling catalytic cracking, the reaction temperature is 630°C, the catalyst: atmospheric residue weight ratio is 20:1, water: atmospheric residue weight ratio is 0.49:1, (alcohol+ether): atmospheric residue weight ratio is 0.38 : 1, dimethyl ether: methanol weight ratio 1: 1, heavy oil feed space velocity 3.7h -1 . Table 9 shows the yield of main products of coupled heavy oil catalytic cracking and the decrease of reactor bed temperature. The composition yield of each product is the ratio of t...

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Abstract

A coupled catalytic cracking method of petroleum hydrocarbons to produce low-carbon olefins, using petroleum hydrocarbons and organic oxygen-containing compounds as raw materials, using a fluidized bed reactor, under the action of a solid acid catalyst and high-temperature water vapor, through coupling The catalytic cracking process to produce light olefins. The reaction conditions are: temperature 500-720°C, weight ratio of catalyst to petroleum hydrocarbon 5-40:1, weight ratio of organic oxygen-containing compound to petroleum hydrocarbon 0.01-2:1, weight ratio of water vapor to petroleum hydrocarbon 0-1 : 1. Petroleum hydrocarbons include low-carbon hydrocarbons, gasoline with different boiling ranges, diesel oil, vacuum gas oil, crude oil or residual oil and their mixtures, especially suitable for various heavy hydrocarbons.

Description

technical field [0001] The present invention belongs to the catalytic cracking method of coupled petroleum hydrocarbons, more specifically, under the action of high-temperature water vapor and solid acid catalyst, the catalytic cracking of petroleum hydrocarbons and organic oxygen-containing compounds is coupled to produce ethylene, propylene and other low carbene method. Background technique [0002] Industrially obtain low-carbon olefins such as ethylene and propylene mainly through the traditional tube furnace cracking method. Under the condition of high reaction temperature, petroleum hydrocarbon molecules undergo carbon bond breakage or dehydrogenation reaction to generate low-carbon olefins with lower molecular weight; because the pyrolysis process of high-temperature tube furnace is easy to coke, most ethylene and propylene production plants adopt The raw materials are light components with high thermal grade in crude oil, such as ethane, light oil and naphtha. As c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G11/18
Inventor 刘中民朱书魁谢鹏杨越李铭芝张今令
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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