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Method for preparing low carbon olefin by hydrocarbon thermal cracking

A technology for low-carbon olefins and carbon-olefins, applied in the field of producing low-carbon olefins, can solve the problems of low heat transfer efficiency, waste of raw hydrocarbon resources, huge energy demand, etc., and achieve the effect of avoiding the heat transfer process

Active Publication Date: 2013-08-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this process changes the thermodynamic system of the cracking reaction, the reaction process does not require external heat supply, but the disadvantages of this process are that 1. The reaction process becomes an exothermic process, and there are still factors that affect the heat transfer process due to the generation of coke; 2. During the reaction By-products CO and CO 2 The formation of raw material hydrocarbon resources has caused waste
[0005] Due to the high temperature and strong heat absorption characteristics of the petroleum hydrocarbon cracking process, the steam thermal cracking process used in industry and the catalytic cracking process under research are faced with huge energy demand and heat transfer efficiency due to ultra-high temperature caused by external indirect heating low problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Naphtha is gasified in a heating furnace at a feed rate of 1000g / h, mixed with 200g / h of diluted steam and heated to 580°C, the heated mixture is mixed with 50g / h of hydrogen, and then mixed with 1200g / h of hydrogen h Air is mixed and enters the hydrogen catalytic combustion device, which is filled with Pt / Al 2 o 3 Catalyst (produced by Beijing Research Institute of Chemical Industry, brand BHO-H2), reaction pressure 0.1MPa, space velocity 4h -1 (weight), after passing through the device, the temperature of the mixed gas reaches 860°C, and enters the adiabatic reaction device after mixing with 300g / h water vapor. In the adiabatic reaction device, the raw material hydrocarbons undergo a cracking reaction to generate low-carbon olefins. After the reaction, the temperature of the mixed gas drops to 750°C. Low-carbon hydrocarbon products such as ethylene propylene (Table 1).

[0036] Table 1

[0037] Composition%

Embodiment 2

[0039] Naphtha is gasified in a heating furnace at a feed rate of 1000g / h, mixed with 200g / h of dilution steam and heated to 580°C, first mixed with 50g / h of hydrogen, then mixed with 240g / h of oxygen, and entered Hydrogen catalytic combustion device filled with Pt / Al 2 o 3 Catalyst (produced by Beijing Research Institute of Chemical Industry, brand BHO-H2), reaction pressure 0.1MPa, space velocity 4h -1 (weight), after passing through the device, the temperature of the mixed gas reaches 860°C, and enters the adiabatic reaction device after mixing with 300g / h water vapor. In the adiabatic reaction device, the raw material hydrocarbons undergo cracking reaction to produce low-carbon olefins. After the reaction, the temperature of the mixed gas drops to 750°C. The mixed gas enters the quenching heat exchange device, and the temperature of the mixed gas quickly drops to 320°C and enters the separation system to obtain ethylene. Propylene and other low-carbon hydrocarbon product...

Embodiment 3

[0043] Naphtha is gasified in a heating furnace at a feed rate of 1000g / h, mixed with 200g / h of dilution steam and heated to 580°C, first mixed with 30g / h of hydrogen, then mixed with 140g / h of oxygen, and entered The first hydrogen catalytic combustion device, which is filled with Pt / Al 2 o 3 Catalyst (produced by Beijing Research Institute of Chemical Industry, brand BHO-H2), reaction pressure 0.1MPa, space velocity 4h -1 (weight), after passing through the device, the temperature of the mixed gas reaches 820°C, and enters the first adiabatic reaction device after mixing with 300g / h water vapor. In the first adiabatic reaction device, the raw material hydrocarbons undergo a cracking reaction to generate low-carbon olefins, and the temperature of the mixed gas drops to 730°C after the reaction;

[0044] The mixed gas is mixed with 12g / h of hydrogen and 60g / h of oxygen into the second catalytic combustion device, which is filled with Pt / Al 2 o 3 Catalyst (produced by Beiji...

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Abstract

The invention discloses a method for preparing low carbon olefin by hydrocarbon thermal cracking. The method comprises the following steps of: introducing preheated hydrocarbon raw materials, hydrogen and oxygen-containing gas into a plurality of units which comprise hydrogen catalytic combustion devices and adiabatic reaction devices; combusting the hydrogen to supply energy to increase the temperature of the mixed materials to the temperature needed by thermal cracking reactions in the hydrogen catalytic combustion devices; generating the thermal cracking reactions to generate physical flows containing the low carbon olefin in the adiabatic reaction devices; and finally, recovering heat by using a quenching device, and obtaining various low carbon olefin products by using a separating system. The method partly changes external heating modes of the hydrocarbon steam cracking process, and saves energy consumption by adopting the internal heating modes. Compared with the hydrocarbon steam cracking process, the technical process has the advantages of low energy consumption, less emission, low production cost, investment saving and the like.

Description

technical field [0001] The present invention relates to a kind of method for preparing light olefins, more particularly, the present invention relates to a kind of method of producing light olefins, especially ethylene, propylene and butene from hydrocarbon feedstock. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important basic raw materials for petrochemicals and play a pivotal role in petrochemicals. At present, most of the light olefins are produced by steam pyrolysis process of feedstock hydrocarbons. The process is to preheat the raw materials to about 600°C and mix them with steam into the cracking furnace tube for reaction. The heat required for the cracking reaction is provided by the high-temperature flue gas in the furnace where the furnace tube is located. Hydrocarbon cracking reaction is a reaction process initiated by free radicals. During the reaction process, C-C or C-H bonds in alkanes need to be cracked to form free ra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C4/04C07C11/04C07C11/06C07C11/16C10G9/00C10G9/28
CPCY02P20/50
Inventor 张利军张勇王国清刘小波杜志国白杰
Owner CHINA PETROLEUM & CHEM CORP