A kind of steam cracking method

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

Active Publication Date: 2016-05-25
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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  • A kind of steam cracking method
  • A kind of steam cracking method
  • A kind of steam cracking method

Examples

Experimental program
Comparison scheme
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 performs the cracking reaction. The specific process includes:

[0085] The mixture of mixed C4 olefin 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] The naphtha 1 (relevant parameters are shown in Table 1) at 60°C is preheated through the raw material preheating section 11; at the same time, the water vapor 3 is preheated through the dilution steam superheating section 13; then the preheated naphtha is preheated. The oil is mixed with preheated steam, and the resulting cracked feedstock mixture is mixed with the first olefin-containing stream, and then enters the mixed heating section 15 to be heated to the crossover temperature, and the...

Embodiment 2

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

[0106]The steam cracking is carried out according to the method of Example 1, the difference is that the first olefin-containing stream is not added, wherein the feeding amount of the naphtha is 45400 kg / h, and the water preheated in the dilution steam superheating section 13 is passed through. 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 amount of the mixed C4 olefins is 1362kg / h, and the hydrogen 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 radiation section of the cracking furnace is 830°C, and the cracking reaction time in radiation section 9 is 0.3 seconds. The other process parameters of the convection section 10 and the quenchi...

Embodiment 3

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

[0113] The steam cracking is carried out according to the method of Example 1, the difference is that the second olefin-containing stream is not added, wherein the feeding amount of naphtha is 43130 kg / h, and the water preheated in the dilution steam superheating section 13 is passed through. 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 2270kg / h, and the injection rate of hydrogen is 25kg / h, the injection volume of water vapor is 2270kg / h, the crossover temperature (XOT) is 590°C, the outlet temperature (COT) of the radiation section of the cracking furnace is 830°C, and the cracking reaction time in the radiation section 9 is 0.24 second. The other process parameters of the convection section 10 and the quenching heat ex...

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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 present 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 steam cracking process of petroleum hydrocarbons in a tubular furnace. According to statistics, about 99% of the world's ethylene, more than 50% of propylene and more than 90% of butadiene are produced through this process. [0003] The production unit established with the core technology of the steam cracking process of the tubular cracking furnace and its downstream cryogenic separation process is called an ethylene unit. The core equipment of the device is a tubular cracking furnace, which is composed of a convection section and a radiation section. The cracked raw material and dilution steam are first heated in the convection section furnace tube respective...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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