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Method for enhancing yield of light olefins in MTO technology

A methanol-to-olefins and low-carbon olefins technology, applied in the direction of hydrocarbon production from oxygen-containing organic compounds, chemical recovery, ethylene production, etc., can solve the problem of low yield of low-carbon olefins

Active Publication Date: 2014-07-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problem of low yield of low-carbon olefins existing in the prior art, and a new method for increasing the yield of low-carbon olefins in the methanol-to-olefins process is provided

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  • Method for enhancing yield of light olefins in MTO technology

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Experimental program
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Effect test

Embodiment 1

[0020] in such as figure 1In the shown reaction device, the average temperature of the first fast bed reaction zone is 480°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 is The gauge pressure is 0.1MPa, the gas linear velocity is 5.0m / s; the average temperature of the second fast bed reaction zone is 500°C, the reaction pressure is 0.1MPa gauge pressure, and the gas linear velocity is 0.8m / s. The carbon deposition amount of the pre-carbon deposition catalyst is 0.5% by weight. The bottom feed of the first fast bed reaction zone is pure methanol, the feed is 2 kg / hour, the catalyst is SAPO-34, and the SiO in the molecular sieve 2 : Al 2 o 3 :P 2 o 5 =0.1:1:1, the mass fraction of the binder in the catalyst is 60%. The bottom feed of the riser reaction zone is mixed C4, the content of C4 olefins is 87%, the bottom feed of the second fast bed...

Embodiment 2

[0022] According to the conditions described in Example 1, the average temperature of the first fast bed reaction zone 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 riser reaction zone is 650°C, The reaction pressure is 0.2MPa in gauge pressure, the linear velocity of gas is 10.0m / s; the average temperature of the second fast bed reaction zone is 630°C, the reaction pressure is 0.2MPa in gauge pressure, and the linear velocity of gas is 2.0m / sec. The carbon deposition amount of the pre-carbon deposition catalyst is 1.8% by weight. The feed at the bottom of the reaction zone of the riser is mixed C4, the content of C4 olefins is 58%, and the stability of the catalyst flow control is maintained. The output product of the reactor is analyzed by online gas chromatography, and the yield of light olefins reaches 85.55% by weight.

Embodiment 3

[0024] According to the conditions described in Example 1, the average temperature of the first fast bed reaction zone 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 riser reaction zone 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 second fast bed reaction zone is 530°C, the reaction pressure is 0.01MPa in gauge pressure, and the linear velocity of gas is 1.0m / 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 85.80% by weight.

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Abstract

The invention relates to a method for enhancing yield of light olefins in MTO technology. The method mainly solves the problem of low yield of light olefins in the prior art, and comprises the following steps that: (1) raw materials containing methanol enter into a first rapid fluidized bed reaction zone and contact with a catalyst containing a silicoaluminophosphate molecular sieve to produce a product flow I containing light olefins and to make the catalyst inactivating; (2) the inactivating catalyst enters into a reactivator for regeneration, the regenerated catalyst enters into a riser reaction zone and contacts with raw materials containing fractions with four or more carbon atoms, the product and catalyst enter into a second rapid fluidized bed reaction zone and contact with raw materials containing fractions with four or more carbon atoms and with a second catalyst coming from the reactivator so as to produce a product flow II containing light olefins and a pre-coked catalyst; (3) after gas-solid separation, the product flow II is mixed with the product flow I, and the mixture is subjected to separation. The technique scheme that pre-coked catalyst returns to the first rapid fluidized bed reaction zone enables effective solving of problems in the prior art and can be used for industrial production of light olefins.

Description

technical field [0001] The invention relates to a method for increasing the yield of low-carbon olefins in the methanol-to-olefins process. 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, na...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/06C07C11/04C07C1/20
CPCY02P20/52Y02P20/584Y02P30/20Y02P30/40
Inventor 齐国祯钟思青杨远飞
Owner CHINA PETROLEUM & CHEM CORP