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Steam cracking method

A steam and cracking furnace technology, applied in the field of steam cracking, can solve the problems of olefin coking, etc., and achieve the effects of increasing butadiene yield, reducing coking, 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

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Effect test

Embodiment 1

[0083] This example is used to illustrate the steam cracking method provided by the present invention.

[0084] Using a convection section such as figure 2 The cracking furnace shown carries out the cracking reaction. The specific process includes:

[0085] The mixture of C4 olefins 16 (the composition is shown in Table 2) and hydrogen is preheated to 190°C through the dilution steam superheating section 13, and then mixed with steam 3 to obtain an olefin-containing stream.

[0086] Naphtha 1 at 60°C (relevant parameters are shown in Table 1) 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 mixed with the first olefin-containing stream, then enters the mixing heating section 15 and is heated to the crossing temperature, and then enters the radiant section...

Embodiment 2

[0105] This example is used to illustrate the steam cracking method provided by the present invention.

[0106]Carry out steam cracking according to the method for embodiment 1, difference is, do not add described first stream containing olefin, wherein, the feeding amount of naphtha is 45400kg / h, the water preheated through dilution steam superheating section 13 The amount of steam is 22700kg / h. In the second olefin-containing stream (that is, the olefin-containing stream introduced at the outlet of the radiant section 9), the injection rate of the mixed C4 olefins is 1362kg / h. The injection rate is 15kg / h, the injection rate of water vapor 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 is 0.3 seconds. Other process parameters of the convection section 10 and the quenching heat exchange device 7 are shown in Table 7, and the...

Embodiment 3

[0112] This example is used to illustrate the steam cracking method provided by the present invention.

[0113] Carry out steam cracking according to the method for embodiment 1, difference is, do not add described second stream containing olefin, wherein, the feeding amount of naphtha is 43130kg / h, the water preheated through dilution steam superheating section 13 The amount of steam is 20430kg / h. In the first olefin-containing stream (that is, the olefin-containing stream introduced in the convection section 10), the injection rate of the mixed C4 olefins is 2270 kg / h, and the injection rate of hydrogen is The injection rate of water vapor is 25kg / h, the injection rate of water vapor 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 Second. Other process parameters of the convection section 10 and the quenching heat excha...

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Abstract

The invention discloses a steam cracking method, and the method comprises the following steps: mixing water vapor with a liquid cracking feedstock, heating an obtained cracking feedstock mixture in a convection section to the stretch-across temperature, and then adding the heated cracking feedstock mixture into a radiation section for cracking reaction, and then injecting an obtained cracking reaction product into a rapid-cooling device for cooling and separating. The method also comprises introduction of an olefin, hydrogen and water vapor mixture at an inlet port of the convection section and / or the radiation section. According to the steam cracking method, in a steam cracking process, an olefin is introduced as a partial cracking feedstock, coking in the convection section of a cracking furnace and the rapid-cooling device may not be produced, the heat from high temperature cracking products of the radiation section can be effectively used, and the yield of butadiene may be 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 王国清张利军周先锋杜志国刘俊杰张永刚
Owner CHINA PETROLEUM & CHEM CORP
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