Steam cracking method

A steam and cracking furnace technology, 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

[0084] This example is used to illustrate the steam cracking method provided by the present invention.

[0085] Using a convection section such as figure 2 The cracking furnace shown carries out the cracking reaction. The specific process includes:

[0086] Mixed C4 olefins 16 (composition shown in Table 1) were added to the evaporator for vaporization to obtain mixed C4 olefins at a temperature of 180°C, and then the mixed C4 olefins were mixed with steam 3 to obtain an olefin-containing stream.

[0087] 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 steam, and the resulting cracking feedstock mixture is heated to crossover temperature through the mixing heating section 15, then mixed with the first olefin-containing stream, and the resulting mixture is ...

Embodiment 2

[0106] This example is used to illustrate the steam cracking method provided by the present invention.

[0107] 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 olefin-containing stream, wherein, the feeding amount of naphtha is 45400kg / h, in convection section 10 The injection rate of the injected water vapor is 22700kg / h, and in the said olefin-containing stream added at the outlet of the radiant section 9, the injection rate of the mixed C4 olefins is 2270kg / h, and the injection rate of the water vapor is 2270kg / h. 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 0.3 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 cracked gas is show...

Embodiment 3

[0113] This example is used to illustrate the steam cracking method provided by the present invention.

[0114] Carry out steam cracking according to the method for embodiment 1, difference is, do not add described olefin-containing stream at the outlet of described radiation section 9, wherein, the feeding amount of naphtha is 43130kg / h, in convection section 10 The injection rate of the injected water vapor is 22700kg / h, and in the stream containing olefins added at the outlet of the radiant section 9, the injection rate of the mixed C4 olefins is 2270kg / h, and the injection rate of the water vapor is 1362kg / h. 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 0.25 seconds. Other process parameters of the convection section 10 and the quenching heat exchange device 7 are shown in Table 9, and the composition of the cracked gas is shown...

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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 addition of a heated olefin or a heated olefin and water vapor mixture at an inlet port and/or an outlet port of the radiation section. According to the steam cracking method, by addition of the olefin at the outlet port and/or the inlet port of the radiation section, 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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Patent Type & Authority Applications(China)
IPC IPC(8): C07C4/04C07C11/04C07C11/06C07C11/16
Inventor 王国清张利军刘俊杰杜志国李蔚周丛杨沙沙
Owner CHINA PETROLEUM & CHEM CORP
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