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Method for producing light olefins with high selectivity by using methanol as raw material

A low-carbon olefin and high-selectivity technology, applied in the direction of biological raw materials, ethylene production, bulk chemical production, etc., can solve the problem of low selectivity of low-carbon olefins, achieve selectivity improvement, increase yield, and reduce back-mixing Effect

Active Publication Date: 2013-12-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problem of low selectivity of low-carbon olefins existing in the prior art, and a new method for producing low-carbon olefins with methanol as a raw material with high selectivity is provided

Method used

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  • Method for producing light olefins with high selectivity by using methanol as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] in such as figure 1 On the shown reaction device, under normal pressure, the catalyst adopts SAPO-34, and the reaction conditions in the reaction zone are as follows: the reaction temperature is 465°C, the average carbon deposition mass fraction of the catalyst is 2.8%, and methanol with a purity of 99.5% passes through at 210°C The distribution plate enters the reaction zone, and a gas-solid rapid separation device is installed at the outlet of the reaction zone. Part of the catalyst to be produced is returned to the lower part of the reaction zone to replenish the catalyst storage in the reaction zone, and a part of the zone is regenerated by the regenerator. The ratio of the diameter of the discharge end to the diameter of the feed end is 0.85, and 78% of methanol has been converted in the space from the distribution plate to 1 / 3 of the height of the reaction zone. The product is analyzed by gas chromatography. The experimental results are: methanol conversion rate 99...

Embodiment 2

[0020] According to the conditions described in Example 1, the reaction conditions in the reaction zone are as follows: the reaction temperature is 500° C., the average carbon deposit mass fraction of the catalyst is 3.97%, and the methanol with a purity of 99.5% enters the reaction zone through a distribution plate at 300° C. and exits the reaction zone. The ratio of the diameter of the feed end to the diameter of the feed end is 0.5, and 70.5% of methanol has been converted in the space from the distribution plate to 1 / 3 of the height of the reaction zone. The product is analyzed by gas chromatography. The experimental result is: the conversion rate of methanol is 99.08% (weight), the low carbon olefin carbon group selectivity is 80.17% (weight).

Embodiment 3

[0022] According to the conditions described in Example 1, the reaction conditions in the reaction zone are as follows: the reaction temperature is 400° C., the average carbon deposit mass fraction of the catalyst is 1.5%, and the methanol with a purity of 99.5% enters the reaction zone through a distribution plate at 170° C. and exits the reaction zone. The ratio of the diameter of the feed end to the diameter of the feed end is 0.95, and 74% of methanol has been converted in the space from the distribution plate to 1 / 3 of the height of the reaction zone. The composition of the product is analyzed by gas chromatography. The experimental result is: the conversion rate of methanol is 99.23% (weight), the low carbon olefin carbon group selectivity is 80.26% (weight).

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Abstract

The invention relates to a method for producing light olefins with high selectivity by using methanol as a raw material, and mainly solves the problem of low selectivity of light olefins in the prior art. The method for producing light olefins with high selectivity by using methanol as a raw material of the invention comprises the following steps: allowing a methanol-containing raw material to enter a reaction region of a fluidized bed reactor with a diameter of a discharging end being less than a diameter of a charging end, allowing the raw material to contact a catalyst which contains a silicon aluminium phosphor molecular sieve, allowing 70% of the methanol to be converted in a space from a raw material charging position to 1 / 3 of the reaction region height so as to obtain a product which contains light olefins; the technical scheme well solves the problem, and the method is applicable to the industrial production of light olefins.

Description

technical field [0001] The invention relates to a method for producing light olefins with high selectivity by using methanol as a raw material. 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 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 conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C1/20C07C11/04C07C11/06
CPCY02P20/52Y02P20/584Y02P30/20Y02P30/40
Inventor 齐国祯王洪涛金永明杨远飞
Owner CHINA PETROLEUM & CHEM CORP