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Method for keeping regenerator temperature stable in low carbon alkene preparation

A low-carbon olefin and regenerator technology, which is applied in the direction of hydrocarbon production from oxygen-containing organic compounds, chemical recovery, organic chemistry, etc., can solve the problems of large temperature fluctuations in the regenerator, so as to avoid excessive dilute phase temperature and reduce O2 Concentration, the effect of reducing cold collapse

Active Publication Date: 2008-12-24
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problem that the regenerator temperature fluctuates greatly in the prior art, and a new method for keeping the temperature of the regenerator stable in the process of preparing low-carbon olefins from oxygen-containing compounds is provided

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  • Method for keeping regenerator temperature stable in low carbon alkene preparation

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Effect test

Embodiment 1

[0017] exist figure 1 In the small-scale dense-phase fluidized bed regenerator shown, the catalyst is SAPO-34 molecular sieve, the amount of carbon deposited on the ungenerated catalyst belt is 4.5% by weight, the regeneration temperature is set at 650°C, the regeneration medium is air, and the air flow rate is 18 meters 3 / hour, the temperature of the regeneration medium is 180°C, the temperature of the regeneration dense phase and the flow rate of the fluidized medium of the external heat extractor of the regenerator adopt automatic cascade control, the external heat extractor of the regenerator is a back-mixing type, the fluidized medium is nitrogen, and the heat exchange The medium is water, the weight ratio of the CO combustion aid to the total amount of catalyst in the regenerator is about 1%, and the CO combustion aid is Pt / Al 2 o 3 , the running results for three consecutive hours show that: O in the generated flue gas 2 The content is always between 0.52% and 0.72%...

Embodiment 2

[0019] exist figure 1 In the shown small-scale dense-phase fluidized bed regenerator, the catalyst is SAPO-18 molecular sieve, the amount of coke deposited on the ungenerated catalyst belt is 7.5% by weight, the regeneration temperature is set at 700°C, the regeneration medium is air, and the air flow rate is 24 meters 3 / hour, the temperature of the regeneration medium is 300°C, the temperature of the regeneration dense phase and the flow rate of the fluidized medium of the external heat extractor of the regenerator adopt automatic cascade control, the external heat extractor of the regenerator is a back-mixing type, the fluidized medium is nitrogen, and the heat exchange The medium is water, the weight ratio of the CO combustion aid to the total amount of catalyst in the regenerator is about 1%, and the CO combustion aid is Pd / Al 2 o 3 , the running results for three consecutive hours show that: O in the generated flue gas 2 The content is always between 0.15 and 0.29% by...

Embodiment 3

[0021] exist figure 1 In the shown small-scale dense-phase fluidized bed regenerator, the catalyst is SAPO-34 molecular sieve, the amount of carbon deposited on the ungenerated catalyst belt is 0.5% by weight, the regeneration temperature is set at 600°C, the regeneration medium is air, and the air flow rate is 10 meters 3 / hour, the temperature of the regeneration medium is 100°C, the regeneration dense phase temperature and the flow rate of the fluidized medium of the external heat extractor of the regenerator adopt automatic cascade control, the external heat extractor of the regenerator is a back-mixing type, the fluidized medium is nitrogen, and the heat exchange The medium is water, the weight ratio of the CO combustion aid to the total amount of catalyst in the regenerator is about 1%, and the CO combustion aid is Pt / Al 2 o 3 , the running results for three consecutive hours show that: O in the generated flue gas 2The content is always between 0.48% and 0.83% by volu...

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Abstract

The invention relates to a method for keeping the regenerator temperature stable during the process of light olefins preparation by oxygen compounds, mainly solves the problem of unstable temperature of the regenerator in the prior art. The method comprises oxidizing reacting the regenerating medium with a temperature between 100 and 300 DEG C in the regenerating zone of a fluidized bed regenerator with an aluminosilicophosphate molecular sieve catalyst with a 0.5-7.5wt% of carbon deposition and a solid particle CO combustion promotor at 600-700 DEG C, forming huge heat while generating the flue gas with O2, CO and CO2, wherein the heat is transported out of the regeneration zone by an external cooler of the regenerator, the weight ratio of the CO combustion promotor and the catalyst in the regeneration zone is not more than 1%, the O2 content in the flue gas is not more than 1% by volume. The technique scheme of the invention well solves the above problem and is suitable to the industrial production of light olefins.

Description

technical field [0001] The invention relates to a method for keeping the temperature of a regenerator stable during the process of preparing light olefins from oxygen-containing compounds. Background technique [0002] Low-carbon olefins, namely ethylene and propylene, are two important basic chemical raw materials, and their demand is increasing. Generally, ethylene and propylene are produced through petroleum routes, but due to the limited supply and high price of petroleum resources, the cost of producing ethylene and propylene from petroleum resources continues to increase. In recent years, people have begun to vigorously develop the technology of converting alternative raw materials into ethylene and propylene. Among them, an important class of alternative raw materials for the production of light olefins are oxygenates, such as alcohols (methanol, ethanol), ethers (dimethyl ether, methyl ethyl ether), esters (dimethyl carbonate, methyl formate Esters), etc., these ox...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C11/02
CPCY02P20/584
Inventor 齐国祯钟思青王洪涛杨远飞
Owner CHINA PETROLEUM & CHEM CORP
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