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Method for preparing aromatic hydrocarbons and low-carbon olefins through conversion of methanol or dimethyl ether

A technology of low-carbon olefins and dimethyl ether, which is applied in the field of circulating fluidized bed reaction-regeneration system, can solve the problems of hydrothermal deactivation of catalysts, reduction of yield of aromatics, affecting the continuous and stable operation of devices, etc.

Inactive Publication Date: 2018-01-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The technical problem to be solved by the present invention is that the temperature of the regenerator in the prior art is relatively high, so that the catalyst is gradually hydrothermally deactivated, the yield of aromatics is reduced, and the problem of affecting the continuous and stable operation of the device is provided. A method for producing aromatics from methanol or dimethyl ether is provided. and lower olefins

Method used

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  • Method for preparing aromatic hydrocarbons and low-carbon olefins through conversion of methanol or dimethyl ether

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Effect test

Embodiment 1

[0039] 1.8 million tons / year methanol production of aromatics and light olefins adopts such as figure 1 In the circulating fluidized bed reaction-regeneration system shown, the fluidized bed reactor is equipped with an internal heat collector, and a metal catalyst 1%Zn / 3%Cu / ZSM-5 is used. The reaction process conditions of the fluidized bed reactor are: the reaction temperature is 470°C, the reaction pressure is 0.2MPa, and the average density of the catalyst in the dense phase zone is 350 kg / m 3 , the average empty tower line speed is 0.7 m / s. The regeneration process conditions of the fluidized bed regenerator are: the temperature of the fast bed is 550°C, the pressure of the fast bed is 0.21MPa, and the average density of the fast bed catalyst is 80 kg / m 3 , the average superficial linear velocity of the fast bed is 1.3 m / s; the secondary temperature is 660°C, the secondary pressure is 0.2MPa, and the average catalyst density in the secondary dense phase zone is 450 kg / m ...

Embodiment 2

[0042] 1.8 million tons / year methanol production of aromatics and light olefins adopts such as figure 1 In the circulating fluidized bed reaction-regeneration system shown, the fluidized bed reactor is equipped with an internal heat collector, and a metal catalyst 1%Zn / 3%Cu / ZSM-5 is used. The reaction process conditions of the fluidized bed reactor are: the reaction temperature is 450°C, the reaction pressure is 0.3MPa, and the average density of the catalyst in the dense phase zone is 300 kg / m 3 , the average superficial velocity is 0.6 m / s. The regeneration process conditions of the fluidized bed regenerator are: the temperature of the fast bed is 540°C, the pressure of the fast bed is 0.31MPa, and the average density of the fast bed catalyst is 50 kg / m 3 , the average superficial linear velocity of the fast bed is 1.6 m / s; the secondary temperature is 690°C, the secondary pressure is 0.3MPa, and the average catalyst density in the secondary dense phase zone is 400 kg / m 3 ...

Embodiment 3

[0045] 1.2 million tons / year methanol production of aromatics and low-carbon olefins adopts such as figure 2 In the circulating fluidized bed reaction-regeneration system shown, the fluidized bed reactor is equipped with an external heat extractor, and a supported metal catalyst 1%Zn / 3%Cu / ZSM-5 is used. The reaction process conditions of the fluidized bed reactor are: the reaction temperature is 480°C, the reaction pressure is 0.3MPa, and the average density of the catalyst in the dense phase zone is 380 kg / m 3 , the average empty tower line speed is 0.8 m / s. The regeneration process conditions of the fluidized bed regenerator are: the temperature of the fast bed is 560°C, the pressure of the fast bed is 0.31MPa, and the average density of the fast bed catalyst is 100 kg / m 3 , the average superficial linear velocity of the fast bed is 1.1 m / s; the second re-temperature is 680°C, the second re-pressure is 0.3 MPa, and the average density of the catalyst in the second re-dense...

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Abstract

The invention relates to a method for preparing aromatic hydrocarbons and low-carbon olefins through conversion of methanol or dimethyl ether, and mainly solves the problems that the temperature of aregenerator in a production process is high, a catalyst is gradually subjected to hydrothermal deactivation, the aromatic hydrocarbon yield is lowered and the continuous and stable operation of a device is influenced. The method adopts the following technical scheme: by using a circulating fluid bed reaction-regeneration system, the methanol and / or the dimethyl ether are / is in contact with one ormore supported metal catalysts through a fluid bed reactor to generate the low-carbon olefins and an effluent which is rich in the aromatic hydrocarbons; and a hydrogen burning process of the deactivated spent catalysts is mainly completed through a rapid bed (8) by controlling the low temperature, and carbon burning is completed through a second dense-phase fluid bed regenerator (11) by controlling the high temperature. Thus, the method favorably solves the problems about the hydrothermal deactivation of the catalysts and the continuous and stable operation in the process of preparing the aromatic hydrocarbons and the low-carbon olefins through conversion of the methanol or the dimethyl ether, and can be used for industrial production of preparing the aromatic hydrocarbons and the low-carbon olefins through conversion of the methanol or the dimethyl ether.

Description

technical field [0001] The invention relates to a method for preparing aromatic hydrocarbons and low-carbon olefins by converting methanol or dimethyl ether. Specifically, it relates to a circulating fluidized bed reaction-regeneration system for preparing aromatics and light olefins by converting methanol or dimethyl ether. Background technique [0002] Ethylene, propylene and aromatics (especially triphenyl, Benzene, Toluene, Xylene, or BTX) are important basic raw materials for organic synthesis. At present, they are mainly produced by petroleum routes. In recent years, the international crude oil price has been running at a high level, which has brought great cost pressure to the production technology of petroleum routes. [0003] For a long time, coal or natural gas to synthesis gas, synthesis gas to methanol and olefins, and aromatics separation technology have had large-scale mature experience, but the process from methanol to ethylene, propylene and aromatics is a b...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C15/04C07C15/06C07C15/08C07C11/04C07C11/06
CPCY02P20/584Y02P30/20Y02P30/40
Inventor 钟思青金永明李晓红王莉
Owner CHINA PETROLEUM & CHEM CORP
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