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Method for producing propylene

A production method and technology of propylene, applied in the field of propylene production, can solve the problem of low propylene yield, achieve the effects of improving selectivity, reducing heat load, and increasing conversion rate of raw materials

Active Publication Date: 2013-09-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is the problem that the yield of propylene in the prior art is not high, and a new production method of propylene is provided

Method used

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  • Method for producing propylene

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Experimental program
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Effect test

Embodiment 1

[0021] In such figure 1 In the reaction device shown, the average temperature of the first fast bed reaction zone is 460°C, the reaction pressure is 0.1MPa in gauge pressure, and the gas linear velocity is 1.5 m / s; the average temperature of the riser reaction zone is 550°C, and the reaction pressure The gauge pressure is 0.1MPa, the gas linear velocity is 5.0 m / s; the average temperature of the second fast bed reaction zone is 470°C, the reaction pressure is 0.1MPa gauge, and the gas linear velocity is 0.8 m / s. The carbon deposit of the pre-carbon catalyst is 0.5% by weight. The bottom feed of the first fast bed reaction zone is pure methanol, the feed is 2 kg / h, the catalyst is SAPO-34, the second raw material is ethane and pentane, the weight ratio is 1:4, and the third raw material is ethylene and Carbon four olefins, the weight ratio is 1.5:1, the regeneration catalyst activity index is 0.95, and the stability of the catalyst flow control is maintained. The reactor outlet...

Embodiment 2

[0023] According to the conditions described in Example 1, the average temperature of the first fast bed reaction zone is 440°C, the reaction pressure is 0.2MPa in gauge pressure, and the gas linear velocity is 2.5 m / s; the average temperature of the riser reaction zone is 650°C, The reaction pressure is 0.2 MPa in gauge pressure, and the gas linear velocity is 10.0 m / s; the average temperature of the second fast bed reaction zone is 630° C., the reaction pressure is 0.2 MPa in gauge pressure, and the gas linear velocity is 2.0 m / sec. The carbon deposit of the pre-carbon catalyst is 1.8% by weight. The second raw material is propane and mixed carbon five, the weight ratio is 1:4, the alkane content in mixed carbon five is 79% (weight), the third raw material is ethylene and mixed carbon four, the weight ratio is 1.5:1, mixed carbon The olefin content in No. 4 is 88%, which maintains the stability of catalyst flow control. The product at the outlet of the reactor is analyzed by ...

Embodiment 3

[0025] According to the conditions described in Example 1, the average temperature of the first rapid bed reaction zone is 380°C, the reaction pressure is 0.01 MPa in gauge pressure, and the gas linear velocity is 0.8 m / s; the average temperature of the riser reaction zone is 510°C, The reaction pressure is 0.01 MPa in gauge pressure, and the gas linear velocity is 3.0 m / s; the average temperature of the second fast bed reaction zone is 450° C., the reaction pressure is 0.01 MPa in gauge pressure, and the gas linear velocity is 1.0 m / sec. The carbon deposit of the pre-carbon catalyst is 1.2% by weight. The second raw material is ethane, propane, pentane, and hexane, and the weight ratio is 1:2:4:2. The third raw material is ethylene, butene-2, methanol, and the weight ratio is 1:1:0.2. Keep the catalyst The stability of flow control, the reactor outlet product is analyzed by on-line gas chromatography, the yield of low-carbon olefin carbon base reaches 83.23% by weight, of whic...

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Abstract

The invention relates to a method for producing propylene, and the method is mainly used for solving the problem of low propylene yield in the prior art. The method mainly comprises the following steps: (1) feeding a first raw material containing methanol into a first rapid fluidized bed reaction zone to be contacted with a catalyst comprising a molecular sieve, thus generating a product material flow I comprising ethylene, propylene and over-C4 hydrocarbon and simultaneously forming an inactivated catalyst; (2) feeding the inactivated catalyst into a regenerator for regeneration, feeding the formed regenerated catalyst into a riser pipe reaction zone so as to be contacted with a second raw material, and feeding the generated product and the catalyst into a second rapid fluidized bed reaction zone to be contacted with a third raw material, thus generating a product material flow II comprising the propylene and simultaneously forming a catalyst with pre-deposited carbon; and (3) mixing the product material flow II subjected to gas-solid separation with the product material flow I, then feeding into a separation station, and returning the catalyst with the pre-deposited carbon back to the first rapid fluidized bed reaction zone, wherein the activity index of the regenerated catalyst is 0.8-1.0, the second raw material comprises C1-C3 alkane and over-C5 hydrocarbon, and the third raw material comprises ethylene and C4 olefin. By using the technical scheme, the problem is well solved, thus the method can be used in industrial production of low-carbon olefin.

Description

Technical field [0001] The invention relates to a method for producing propylene. technical background [0002] Propylene is an important basic chemical raw material, and its demand is constantly increasing. Generally, propylene is produced through the petroleum route, but due to the limited supply of petroleum resources and higher prices, the cost of producing propylene from petroleum resources continues to increase. In recent years, people have begun to vigorously develop alternative raw materials conversion technology to produce propylene. Among them, an important type of alternative raw materials for the production of light olefins are oxygenated compounds, such as alcohols (methanol, ethanol), ethers (dimethyl ether, methyl ethyl ether), esters (dimethyl carbonate, methyl formate). These oxygen-containing compounds can be converted from energy such as coal, natural gas, and biomass. Certain oxygen-containing compounds can already be produced on a larger scale, such as met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C11/06C07C11/04
CPCY02P20/584Y02P30/20Y02P30/40
Inventor 齐国祯钟思青金永明
Owner CHINA PETROLEUM & CHEM CORP