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
Comparison scheme
Effect test

Embodiment 1

[0077] This example is used to illustrate the steam cracking method provided by the present invention.

[0078] Using a convection section such as figure 2 The cracking furnace shown carries out the cracking reaction. The specific process includes:

[0079] 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 steam, and the resulting cracked raw material mixture is heated to the crossing temperature through the mixing heating section 15, and then mixed with the first stream of mixed C4 olefins 16 (the composition is shown in Table 2), and the obtained The mixture is injected into the radiant section 9 for cracking reaction; then the cracked reaction product obtained is mixed with the second stream of mixed C4 olefins 16 (composition shown in Table 2) and reacte...

Embodiment 2

[0098] This example is used to illustrate the steam cracking method provided by the present invention.

[0099] Carry out steam cracking according to the method for embodiment 1, and difference is, do not add described mixed C4 olefin at the inlet of described radiant section 9, wherein, the feeding amount of naphtha is 45400kg / h, and the injection amount of steam The injection rate of the second stream of mixed C4 olefins 16 is 1362kg / 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 The cleavage reaction time 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 shown in Table 8 through separation and analysis of the cracked gas.

[0100] Table 7

[0101]

[0102] Table 8

[0103] components

Embodiment 3

[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 mixed C4 olefins at the outlet of described radiant section 9, wherein, the feeding amount of naphtha is 43130kg / h, the injection amount of steam is 22700kg / h, the amount of the mixed C4 olefins injected at the outlet of the radiant section 9 is 2270kg / h, the crossover temperature (XOT) is 590°C, and the outlet temperature (COT) of the radiant section of the cracking furnace is 830 °C, the cleavage reaction time in the radiation 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 9, and the composition of the cracked gas is shown in Table 10 through separation and analysis of the cracked gas.

[0107] Table 9

[0108]

[0109] Table 10

[0110] components

[0111...

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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, then heating in a convection section to the stretch-across temperature, and then entering 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 at least one of the flowing to processes: before a heated cracking feedstock mixture is added into the radiation section, the heated cracking feedstock mixture is mixed with an olefin; and (2) before the cracking reaction product is injected into the rapid-cooling device, the cracking reaction product is contacted with the olefin for reaction. 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 周先锋王国清张利军刘俊杰杨沙沙杜志国张永刚
Owner CHINA PETROLEUM & CHEM CORP
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