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Ethylene cracking furnace coking restrainer and its use method

A technology of coking inhibitor and ethylene cracking furnace, which is applied in the direction of hydrocarbon cracking to hydrocarbon production, cracking, non-catalytic thermal cracking, etc., can solve the problem that the yield of ethylene and the utilization rate of raw materials cannot effectively improve the life of the furnace tube, and the coking inhibitor cannot be uniform. It can effectively reduce the production volume and other problems, so as to achieve the effect of inhibiting coking, reducing the temperature of the metal surface and the pressure difference of the furnace tube, preventing carburization and preventing the formation of coke.

Inactive Publication Date: 2008-12-10
北京斯伯乐科学技术研究院
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the production cost of this kind of coking inhibitor is not high, the component is single, the inhibitory effect is general, and the pollution is relatively large. When the usage amount is more than 300ppm, the operating period of the device can only reach 50-70 days, and the cracking furnace The tube wall is highly corrosive, which cannot effectively improve the life of the furnace tube, the yield of ethylene and the utilization rate of raw materials, and cannot effectively reduce CO and CO 2 At the same time, there is also the disadvantage that the coking inhibitor cannot be evenly distributed on the inner surface of the coke oven tube

Method used

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  • Ethylene cracking furnace coking restrainer and its use method
  • Ethylene cracking furnace coking restrainer and its use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 17

[0022] The coking inhibitor in Example 1 was applied to the simulated cracking furnace experiment. The experimental furnace type was STRIII, and the cracking temperature was set at 880°C. The raw material oil was naphtha, and the gasoline ratio was 0.6; The raw oil inlet of the furnace is continuously injected into the raw oil online, the residence time in the cracking furnace tube is 0.1s, and the mass concentration of the coking inhibitor after injection is 500ppm. The operation period of the equipment is 130 days, and the yield of the total triene is 52.84%.

Embodiment 18

[0024] The coking inhibitor in Example 2 was applied to the simulated cracking furnace experiment. The experimental furnace type was STRIII, and the cracking temperature was set at 880°C. The raw material oil was naphtha, and the gasoline ratio was 0.6, and the residence time in the cracking furnace tube was 0.1 The mass concentration of coking inhibitor after s injection is 450ppm. The operation period of the equipment is 126 days, and the yield of total triene is 52.67%.

Embodiment 19

[0026] The coking inhibitor in Example 3 was applied to the simulated cracking furnace experiment. The experimental furnace type was STRIII, and the cracking temperature was set at 880°C. The raw material oil was naphtha, and the gasoline ratio was 0.6. The raw oil inlet of the furnace is continuously injected into the raw oil online, and the residence time in the cracking furnace tube is 0.1s. After injection, the mass concentration of the coking inhibitor is 400ppm. The operation period of the equipment is 123 days, and the yield of total triene is 51.36%.

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Abstract

The present invention relates to a coking depressor for an ethylene cracking furnace, and a method for using the same. The depressor consists of a thiol compound, a quinoline compound, a disalicylic acid compound and an organic solvent. The coking depressor not only overcomes the shortcomings in the prior depressor that the manufacturing cost is high, the injection operation is difficult, the distribution in the cracking furnace tube is uneven, and the depressor erodes the inner wall of the furnace tube, etc., but also effectively prolongs the service life of the cracking furnace and improves the yield of ethylene, the usage of the material and the load of an ethylene device. The producing amount of CO and CO2 is largely reduced, and thus the depressor is safe and environment-friendly.

Description

Technical field: [0001] The invention relates to an ethylene cracking furnace coking inhibitor and a using method thereof. Background technique: [0002] The ethylene cracking furnace is an important core equipment for producing ethylene, and more than half of the energy is consumed in the cracking furnace. Since the cracking furnace is a high-temperature part in the ethylene plant, the hydrocarbon cracking reaction will be accompanied by secondary reactions such as polymerization and condensation. Under the joint action of the metal on the furnace tube wall and the free radical reaction in the material, Causes coking to occur on the tube wall of the cracking furnace. Coking will increase the thermal resistance of the tube wall and reduce the heat transfer coefficient of the tube wall, resulting in an increase in wall temperature and local overheating; coking will also reduce the inner diameter of the furnace tube and increase the pressure drop of the liquid, resulting in a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/04C07C4/02C10G9/16
Inventor 刘宽胜王秀芬史正光高志礼何宏晓裴浩侯金顺刘志清
Owner 北京斯伯乐科学技术研究院
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