Method for preparing low-carbon olefins from oxygen-containing compound

A technology for low-carbon olefins and compounds is applied in the field of preparing low-carbon olefins from oxygen-containing compounds, which can solve the problem of low yield of low-carbon olefins, and achieve the effects of improving the total yield and improving economy.

Active Publication Date: 2008-09-10
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problem that the yield of low-carbon olefins in

Method used

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  • Method for preparing low-carbon olefins from oxygen-containing compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0020] In the fast fluidized bed reactor, the reaction system is the same as figure 1 . The average temperature of the reaction zone is 500°C, the reaction pressure is 0.1MPa in terms of gauge pressure, pure methanol is fed, and the methanol weight hourly space velocity is 25 hours -1 , the catalyst type is shown in Table 1, the stripping medium in the stripping zone is water vapor, the lifting medium of the regenerated catalyst standpipe is water vapor, the heat exchange medium with the catalyst to be regenerated in the heat exchanger 7 is methanol, the weight of the heat exchange medium and the raw material The flow rate ratio was 0.05:1. The first part of the spent catalyst that enters the regenerator 12 through the catalyst delivery line 6 accounts for 40% by weight of the total spent catalyst, and 100% of the regenerated catalyst enters the catalyst delivery standpipe and contacts with the lifting medium. The average amount of carbon deposited on the catalyst is 2.5% by...

Embodiment 5～6

[0024] According to the conditions described in Example 4, only the reactor temperature was changed, and the experimental results are shown in Table 2.

[0025] Table 2

[0026] parameters

Embodiment 7～8

[0028] According to the conditions described in Example 4, only the type of raw material and the weight hourly space velocity of the raw material were changed, and the experimental results are shown in Table 3.

[0029] table 3

[0030]

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Abstract

The invention relates to a method used to prepare low carbon alkene by means of oxygen compound, and mainly aims to solve the problem of the prior art that the yield of the low carbon alkene is low. The method divides steam stripped spent catalyst into two parts, wherein the first part of the spent catalyst is fed into a regenerator to contact regenerating medium, thereby forming regenerated catalyst, while the second part is fed into a heat exchanger to exchange heat with heat exchange medium and then returns to the bottom of a reaction zone; at least one part of the regenerated catalyst returns to a steam stripping zone through a catalyst stand pipe so as to be mixed with the spent catalyst; moreover, the heat exchange medium is selected from at least one raw material or product, and the weight flow rate ratio between the heat exchange medium and the raw materials is between 0.01:1 and 0.5:1. The technical proposal according to which the heat exchange medium is fed into the reaction zone after exchanging heat with the second part of catalyst solves the problem better, and can be used in the industrial production of low carbon alkene.

Description

technical field [0001] The invention relates to a method for preparing low-carbon olefins from oxygen-containing compounds. technical background [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 oxygenated compounds can be converted from coal, natural gas, bioma...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C11/02B01J29/85B01J29/90
CPCY02P20/584Y02P30/20Y02P30/40
Inventor 齐国祯钟思青金永明王华文
Owner CHINA PETROLEUM & CHEM CORP
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