Steam cracking method

A cracking furnace and dilution steam technology, applied in the field of steam cracking, can solve problems such as coking in the convection section

Inactive Publication Date: 2016-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0020] The purpose of the present invention is to provide a new steam cracking method in order to overcome the problem that unsatu

Method used

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Embodiment 1

[0056] This example is used to illustrate the steam cracking method provided by the present invention.

[0057] use figure 2 The cleavage apparatus shown performs the cleavage reaction. The specific process includes:

[0058] C4, C5 and C6 olefins (composition as shown in Table 1) are vaporized in a vaporization device; the dilution steam 3 is preheated through the raw material preheating section 11 in the convection section of the cracking furnace, and the unsaturated hydrocarbon The weight ratio of 1 and the amount of the dilution steam 3 is 1:0.4; then the vaporized gas phase unsaturated hydrocarbon is mixed with the gas of the dilution steam preheated by the raw material preheating section 11 to obtain a cracking raw material mixture; Then a part of this cracking raw material mixture is introduced from the radiant section 9 outlet of cracking furnace, and another part is introduced from the top of the radiant section 9 of cracking furnace and carries out cracking reacti...

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Abstract

The present invention discloses a steam cracking method, which is performed in a vaporization apparatus and a cracking furnace, wherein the cracking furnace comprises a convection section and a radiation section. The method comprises that unsaturated hydrocarbon is vaporized in the vaporization apparatus, diluted steam is pre-heated in the convection section of the cracking furnace, the vaporized gas-phase unsaturated hydrocarbon and the pre-heated diluted steam are mixed, one part of the obtained cracking raw material mixture is introduced into the outlet position of the cracking furnace radiation section and is cracked, and the other part is introduced from the top portion of the cracking furnace radiation section and is cracked. With the steam cracking method of the present invention, the temperature of the unsaturated hydrocarbon in the convection section pre-heating alignment tube is reduced so as to reduce the coking rate of the unsaturated hydrocarbon in the pre-heating alignment tube and slow or avoid the coking of the cracking raw material during the pre-heating process in the convection section, such that the possibility of the cracking furnace work stopping caused by the coking at the convection section is reduced, and the smooth operating of the cracking furnace is ensured.

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] There are two main sources of raw materials for the production of low-carbon olefins such as ethylene, propylene and butadiene. One is light hydrocarbons by-product of natural gas, such as ethane, propane, butane and natural gasoline, etc.; Products, such as refinery gas, naphtha, diesel, and secondary processing products, such as coking hydrogenated naphtha, hydrogenated tail oil, etc. A common feature of these raw materials is that most of them are ...

Claims

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Application Information

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IPC IPC(8): C07C4/04C07C11/04C07C11/06C07C11/16
Inventor 王国清张利军张永刚周丛周先锋巴海鹏张兆斌
Owner CHINA PETROLEUM & CHEM CORP
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