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Process for converting oxygen-containing compound to prepare low carbon olefin hydrocarbon

A technology of low-carbon olefins and compounds, which is applied in the field of conversion of oxygen-containing compounds to low-carbon olefins, which can solve the problems of catalyst loss and other problems, and achieve the effect of simple and convenient operation and low cost

Active Publication Date: 2012-05-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that there is a large amount of catalyst loss in the prior art, and a new method for converting oxygen-containing compounds to produce low-carbon olefins is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The methanol raw material that concentration is 99.5% (weight) drops into the MTO reactor that SAPO-34 catalyzer is housed, and reactor is a fast fluidized bed reactor, and a secondary cyclone separator is installed in the reactor, and this reactor is at reaction temperature at 495°C and a reaction pressure of 0.08 MPa (in gauge pressure), the fluidization medium is water vapor, and the components of the reaction product stream flowing out from the outlet of the above-mentioned MTO reactor are shown in Table 1; the outlet of the reactor is connected to a Heat exchanger, the heat exchange medium is methanol raw material, the outflow temperature of the reaction product stream after heat exchange is 185°C; after heat exchange, it enters the plate scrubber, and the reaction product stream out of the scrubber does not contain fine powder, and its temperature is 20°C .

[0014] Table 1 Reactor outlet reaction product stream components (1)

[0015] components

Embodiment 2

[0017] According to the conditions of Example 1, only the reaction temperature is changed to 350 DEG C, and other operating conditions are unchanged, the components of the reaction product stream flowing out from the outlet of the above-mentioned MTO reactor are as shown in Table 2; the outflow of the reaction product stream after heat exchange The temperature is 162°C; the reaction product flow out of the washing tower does not contain fine powder, and its temperature is 15°C.

[0018] Table 2 Reactor outlet reaction product stream components (2)

[0019] components

Embodiment 3

[0021] According to the conditions of Example 1, only the reaction temperature is changed to 525 ° C, and other operating conditions are unchanged, the components of the reaction product stream flowing out from the outlet of the above-mentioned MTO reactor are as shown in Table 3; the outflow of the reaction product stream after heat exchange The temperature is 191°C; the reaction product flow out of the washing tower does not contain fine powder, and its temperature is 23°C.

[0022] Table 3 Reactor outlet reaction product stream components (3)

[0023] components

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PUM

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Abstract

The present invention relates to a method for preparing low carbon alkene by reforming an oxygen-containing compound. The method mainly solves the problem of the prior art that a large amount of catalyst is dissipated. The method adopts materials comprising the oxygen-containing compound to contact with a molecular sieve catalyst at an effective condition so as to produce a product flow which comprises low carbon alkene and a catalyst formation flow 1. The product flow 1 enters a gas-solid separation zone. After passing through a cyclone, the weight fraction of the catalyst in the formed production flow 2 is not larger than 0.4 percent. After the product flow 2 enters a heat exchanger to exchange heat, the temperature of the product flow at the outlet of the heat exchanger is between 110 and 400 DEG C. The product flow 2 coming from the heat exchanger enters a scrubbing device to transmit the catalyst from the product flow 2 to a scrubbing media, and simultaneously, the weight fraction of the catalyst in the formed low carbon alkene-containing gas phase product is not larger than 0.001 percent. The technical proposal that heat exchanging media is a material comprising the oxygen-containing compound, water, a recycled C4 olefin product and a recycled oxygen-containing perfectly solves the problem, and can be used in the industrial production of preparing the low carbon alkene by reforming the oxygen-containing compound.

Description

technical field [0001] The invention relates to a method for converting oxygen-containing compounds to produce low-carbon olefins. Background technique [0002] Low-carbon olefins, mainly ethylene and propylene, are two important basic chemical raw materials, and their demand is constantly 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 low-carbon olefins is oxygenated compounds, such as alcohols (methanol, ethanol), ethers (dimethyl ether, methyl ethyl ether), esters (dimethyl carbonate, methyl formate Esters), etc., these oxygenated compounds can be convert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C11/02B01J29/85B01J29/90
CPCY02P20/584
Inventor 王洪涛齐国祯钟思青俞志楠
Owner CHINA PETROLEUM & CHEM CORP