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Steam cracking method

A technology of steam and cracking furnace, applied in the field of steam cracking, can solve problems such as olefin coking, and achieve the effect of improving butadiene yield and high butadiene yield

Active Publication Date: 2014-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to provide a new steam cracking method in order to overcome the problem that coking will occur when olefins are injected into the cracking furnace as part of the cracking raw material

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0081] This example is used to illustrate the steam cracking method provided by the present invention.

[0082] Using a convection section such as figure 2 The cracking furnace shown carries out the cracking reaction. The specific process includes:

[0083] Naphtha 1 at 60°C (relevant parameters are shown in Table 2) is preheated through raw material preheating section 11; at the same time, water vapor 3 is preheated through dilution steam superheating section 13; then the preheated naphtha The oil is mixed with preheated water vapor, and the obtained cracking raw material mixture is heated to the crossing temperature through the mixing heating section 15, and then mixed with C4 olefins 16 (the composition is shown in Table 1), hydrogen 18 and steam 3 The mixed first olefin-containing stream is mixed, and the obtained mixture is injected into the radiant section 9 for cracking reaction; The second olefin-containing stream mixed with water vapor 3 is mixed and reacted, and ...

Embodiment 2

[0102] This example is used to illustrate the steam cracking method provided by the present invention.

[0103] Carry out steam cracking according to the method for embodiment 1, difference is, at the inlet of described radiant section 9, do not add described first stream containing olefin, wherein, the feeding amount of naphtha is 45400kg / h, after The amount of water vapor preheated in the dilution steam superheating section 13 is 22700kg / h, in the second stream containing olefins, the injection amount of water vapor is 2270kg / h, the feeding amount of mixed C4 olefins is 1362kg / h, the amount of hydrogen The injection rate is 15kg / h, the crossover temperature (XOT) is 590°C, the outlet temperature (COT) of the radiant section of the cracking furnace is 830°C, and the cracking reaction time in the radiant section 9 is 0.24 seconds. Other process parameters of the convection section 10 and the quenching heat exchange device 7 are shown in Table 7, and the composition of the crac...

Embodiment 3

[0109] This example is used to illustrate the steam cracking method provided by the present invention.

[0110]Carry out steam cracking according to the method for embodiment 1, difference is, at the outlet place of described radiant section 9, do not add described second strand olefin-containing stream, wherein, the feeding amount of naphtha is 43130kg / h, after The amount of steam preheated in the dilution steam superheating section 13 is 22700kg / h. In the first olefin-containing stream, the injection rate of the mixed C4 olefins is 2270kg / h, the injection rate of hydrogen is 25kg / h, and the water The injection rate of steam is 2270kg / h, the crossover temperature (XOT) is 590°C, the outlet temperature (COT) of the radiant section of the cracking furnace is 830°C, and the cracking reaction time in the radiant section 9 is 0.24 seconds. Other process parameters of the convection section 10 and the quenching heat exchange device 7 are shown in Table 10, and the composition of th...

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Abstract

A steam cracking method comprises the following steps: mixing a liquid cracking raw material with water steam, heating the above obtained cracking raw material mixture in a convection section to an across temperature, carrying out a cracking reaction, injecting the above obtained cracking reaction product into a quenching apparatus, and cooling and separating, wherein the method also comprises at least one of the following two processes: 1, the heated cracking raw material mixture is mixed with a material flow containing olefin before the heated cracking raw material mixture is added to a radiant section; and 2, the cracking reaction product contacts and reacts with the material flow containing olefin before the cracking reaction product is injected to the quenching apparatus. The method allows the material flow containing olefin to be introduced at the outlet and / or inlet of the radiant section, so coking generated in the convection section of a cracking furnace and in the quenching apparatus does not appear, the effective utilization of heat of high temperature cracking products from the radiant section can be realized, and the butadiene yield is improved.

Description

technical field [0001] The invention relates to a steam cracking method. Background technique [0002] Low-carbon olefins such as ethylene, propylene and butadiene are important basic raw materials for the petrochemical industry. At present, the method for producing low-carbon olefins is mainly based on the tube furnace petroleum hydrocarbon steam cracking process. According to statistics, about 99% of ethylene, more than 50% of propylene and more than 90% of butadiene in the world are produced through this process. [0003] The production plant established with the core technology of the tube cracking furnace steam cracking process and its downstream cryogenic separation process is called an ethylene plant. The core equipment of the device is a tube cracking furnace, which is composed of a convection section and a radiation section. The pyrolysis raw material and dilution water vapor are firstly heated in the convection section furnace tube respectively, the two are mixe...

Claims

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Application Information

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IPC IPC(8): C07C4/04C07C11/04C07C11/06C07C11/16
Inventor 王国清周先锋张利军杜志国张永刚刘俊杰张兆斌
Owner CHINA PETROLEUM & CHEM CORP
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