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Method for increasing production of low-carbon olefins

A technology of low-carbon olefins and products, which is applied in the field of increasing production of low-carbon olefins, and can solve the problem of low yield of low-carbon olefins

Active Publication Date: 2011-01-12
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 low yield of low-carbon olefins in the prior art, and a new method for increasing the production of low-carbon olefins is provided

Method used

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  • Method for increasing production of low-carbon olefins

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Experimental program
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Effect test

Embodiment 1

[0018] in such as figure 1 In the shown reaction device, the first reaction zone 2 is a fast fluidized bed, the average temperature is 480° C., the reaction pressure is 0.1 MPa in gauge pressure, and the gas linear velocity is 1.5 m / s; the second reaction zone 14 is a lift tube, the average temperature is 550°C, the reaction pressure is 0.1 MPa by gauge pressure, and the gas linear velocity is 5.0 m / s; the third reaction zone 9 is a dense-phase fluidized bed, the average temperature is 500°C, and the reaction pressure is by gauge pressure Calculated as 0.1MPa, the gas linear velocity is 0.5 m / s. The carbon deposition amount of the pre-carbon deposition catalyst is 0.5% by weight. The feed at the bottom of the first reaction zone 2 is pure methanol, the feed is 2 kg / hour, the catalyst is modified SAPO-34, the feed 12 at the bottom of the second reaction zone 14 is mixed carbon four, and the content of carbon four olefins is 87%. The feed 10 at the bottom of the three reaction...

Embodiment 2

[0020]According to the conditions described in Example 1, the average temperature of the first reaction zone 2 is 500°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 second reaction zone 14 is 650°C, The reaction pressure is 0.2 MPa in gauge pressure, the linear velocity of gas is 10.0 m / s; the average temperature of the third reaction zone 9 is 630° C., the reaction pressure is 0.2 MPa in gauge pressure, and the linear velocity of gas is 1.0 m / s. The carbon deposition amount of the pre-carbon deposition catalyst is 1.8% by weight. The feed 12 at the bottom of the second reaction zone 14 is mixed carbon tetraolefins, the content of carbon tetraolefins is 58%, and the stability of the catalyst flow control is maintained. The product at the outlet of the reactor is analyzed by online gas chromatography, and the yield of light olefins reaches 85.27% by weight.

Embodiment 3

[0022] According to the conditions described in Example 1, the average temperature of the first reaction zone 2 is 400°C, the reaction pressure is 0.01MPa in gauge pressure, and the gas linear velocity is 0.8 m / s; the average temperature of the second reaction zone 14 is 600°C, The reaction pressure is 0.01MPa in gauge pressure, the linear velocity of gas is 3.0m / s; the average temperature of the third reaction zone 9 is 530°C, the reaction pressure is 0.01MPa in gauge pressure, and the linear velocity of gas is 0.3m / sec. The carbon deposition amount of the pre-carbon deposition catalyst is 0.1% by weight. The stability of catalyst flow control is maintained, and the outlet product of the reactor is analyzed by online gas chromatography, and the yield of low-carbon olefins reaches 85.79% by weight.

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Abstract

The invention relates to a method for increasing the production of low-carbon olefins, which mainly solves the problem of low yield of the low-carbon olefins in the prior art. The method for increasing the production of the low-carbon olefins comprises the following steps that: (1) raw materials containing methanol enter a first reaction zone and contacts a silicoaluminophosphate molecular sieve catalyst to generate product material flow I and form an inactivated catalyst simultaneously; (2) the inactivate catalyst enters a regenerator for regeneration, the regenerated catalyst enters a second reaction zone and contacts hydrocarbon having more than four carbon atoms, and the product and the catalyst enter a third reaction zone and contact the hydrocarbon having more than four carbon atoms to generate a product material flow II and form a pre-carbon-deposit catalyst simultaneously; and (3) the product material flow II is subjected to gas-solid separation and is mixed with the product material flow I to enter a separation section. The technical scheme that the pre-carbon-deposit catalyst returns the first reaction zone solves the problem well, and can be used for the industrial production of the low-carbon olefins.

Description

technical field [0001] The invention relates to a method for increasing the production of low-carbon olefins. 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, biomass and other e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C1/20C07C11/04C07C11/06B01J29/85
CPCY02P20/52Y02P20/584Y02P30/20Y02P30/40
Inventor 齐国祯钟思青王洪涛王华文
Owner CHINA PETROLEUM & CHEM CORP
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