Steam cracking method

A technology of cracking furnace and vaporization device, which is applied in the field of steam cracking, can solve problems such as coking in the convection section, and achieve the effects of avoiding coking, increasing the heating rate and improving the selectivity.

Inactive Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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Problems solved by technology

[0031] The purpose of the present invention is to provide a new steam cracking method in order to overcome the problem that unsatu

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Example Embodiment

[0065] Example 1

[0066] This example is used to illustrate the steam cracking method provided by the present invention.

[0067] use figure 1 The cracking furnace shown preheats the convection section and conducts the cracking reaction. The specific process includes:

[0068] The olefins of C4, C5 and C6 (the compositions are shown in Table 1) are vaporized in a vaporizer;

[0069] The mixed gas of the vaporized gas-phase unsaturated hydrocarbons 1 and the dilution steam 3 is preheated in the convection section of the cracking furnace through the raw material preheating section, and the weight ratio of the amount of the unsaturated hydrocarbons 1 and the dilution steam 3 is is 1:0.4; then the mixed gas of gas-phase unsaturated hydrocarbons and dilution steam preheated in the preheating section of the raw material is preheated in the preheating section to obtain a mixture of cracking raw materials; wherein, the pipes in the convection section of the cracking furnace are ar...

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Abstract

The invention discloses a steam cracking method. The method comprises the following steps: vaporizing unsaturated hydrocarbons in a vaporization device, mixing the vaporized gaseous unsaturated hydrocarbons with dilution steam, introducing the above obtained cracking raw material mixture to the convection section of a cracking furnace, preheating the cracking raw material mixture, introducing the preheated cracking raw material mixture from the middle position of the radiation section of the cracking furnace, and carrying out a cracking reaction, wherein a diameter ratio of a preheating row to a connecting box is 1:5-12, and preferably 1:8-10, and the middle position of the radiation section of the cracking furnace is the 1/4-1/5 position of the height of the cracking furnace. The steam cracking method improves the heating speed of the cracking raw material in a cracking furnace tube in order to improve the selectivity of the cracking reaction, so the yield of ethylene, propylene and butadiene is substantially 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 of 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 sa...

Claims

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Application Information

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IPC IPC(8): C07C11/04C07C11/06C07C11/16C07C4/04C10G9/20
Inventor 张利军王国清巴海鹏杜志国周丛张永刚张兆斌周先锋
Owner CHINA PETROLEUM & CHEM CORP
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