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Method for converting methanol into propylene

A methanol conversion and methanol technology, which is applied in organic chemistry, hydrocarbon cracking to hydrocarbon production, bulk chemical production, etc., can solve the problems of discontinuous production and low propylene selectivity, so as to increase raw material processing capacity, improve propylene selectivity, The effect of strengthening the heat removal ability

Inactive Publication Date: 2012-11-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides a method for converting methanol into propylene, which mainly solves the problems of heat removal, discontinuous production and low selectivity of propylene in the current strong exothermic reaction in the moving bed reactor for methanol to propylene

Method used

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  • Method for converting methanol into propylene
  • Method for converting methanol into propylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] The catalyst used in this example is a ZSM-5 molecular sieve spherical catalyst with a particle size of 1.6mm-2mm, and the raw material used is methanol.

[0057] The methanol reaction zone adopts a moving bed reactor with an inlet temperature of 250°C and normal pressure operation.

[0058] The first reaction zone adopts three moving bed reactors, each with an inlet temperature of 500°C, operated under normal pressure, and the mixture of methanol, dimethyl ether and water is divided into three reactant streams according to the weight ratio of 1:1.4:1.8; the quenching liquid uses methanol .

[0059] The second reaction zone adopts a moving bed reactor with an inlet temperature of 525°C and normal pressure operation.

[0060] The carbon deposition catalyst carbon deposition amount removed from the bottom of the catalyst bed is less than 2%, and it is sent to the regenerator for regeneration. The catalyst carbon deposition amount after regeneration is less than 0.5% (car...

Embodiment 2

[0071] The catalyst used in this example is a ZSM-5 molecular sieve spherical catalyst with a particle size of 1.6mm-2mm, and the raw material used is methanol.

[0072] Two moving bed reactors are used in the methanol reaction zone, each with an inlet temperature of 280°C and normal pressure operation.

[0073] The first reaction zone adopts four moving bed reactors, each inlet temperature is 450°C, operated under normal pressure, the mixture of methanol, dimethyl ether and water is divided into four reactant streams according to the weight ratio of 1:1.4:1.8:1.2; A mixture of methanol and water was used.

[0074] The second reaction zone adopts a moving bed reactor with an inlet temperature of 465°C and normal pressure operation.

[0075] The carbon deposition catalyst carbon deposition amount removed from the bottom of the catalyst bed is less than 2%, and it is sent to the regenerator for regeneration. The catalyst carbon deposition amount after regeneration is less than ...

Embodiment 3

[0085] The catalyst used in this example is a ZSM-5 molecular sieve spherical catalyst with a particle size of 2mm-3mm, and the raw material used is methanol.

[0086] The methanol reaction zone adopts a moving bed reactor, each inlet temperature is 300°C, and it operates under normal pressure.

[0087] The first reaction zone adopts three moving bed reactors, each inlet temperature is 450°C, and is operated under normal pressure. The mixture of methanol, dimethyl ether and water is divided into three reactant streams according to the weight ratio of 1:1.4:1.8; the quenching liquid uses methanol Mixture with water.

[0088] The second reaction zone adopts a moving bed reactor with an inlet temperature of 480°C and normal pressure operation.

[0089] The carbon deposition catalyst carbon deposition amount removed from the bottom of the catalyst bed is less than 2%, and it is sent to the regenerator for regeneration. The catalyst carbon deposition amount after regeneration is l...

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Abstract

The invention discloses a method for converting methanol into propylene, which comprises the following steps of: introducing methanol into a methanol reaction zone to perform reaction so as to obtain a mixture of the methanol, dimethyl ether and water; dividing the mixture into a plurality of reactant streams; feeding the first reactant stream to a first reaction zone to perform reaction to obtain a product stream, mixing the product stream and any one of the other reactant streams, feeding the mixture to the first reaction zone to perform reaction until the product stream is mixed with the last reactant stream and feeding the mixture to the first reaction zone to perform reaction so as to obtain a primary reaction product stream; separating the primary reaction product stream to obtain the propylene, propane, C1 to C2 hydrocarbon, C4 hydrocarbon, C5 to C6 hydrocarbon and hydrocarbons with more than seven carbon atoms; circulating the C1 to C2 hydrocarbon and the C4 hydrocarbon to the first reaction zone to perform reaction continuously; feeding the C5 to C6 hydrocarbon and part of the hydrocarbons with more than seven carbon atoms to the second reaction zone to perform reaction so as to obtain a secondary reaction product stream; and separating the secondary reaction product stream to obtain the propylene. The method is suitable for the reactions with high heat discharge and temperature sensitivity such as the reaction for preparing the propylene from the methanol and has the advantages of high target selectivity, continuous and stable reaction and high efficiency.

Description

technical field [0001] The invention relates to a method for preparing propylene, in particular to a method for converting methanol into propylene. Background technique [0002] Propylene is a basic chemical raw material necessary for the modern chemical industry. With the continuous development of the industrial economy, the demand will continue to grow in the future. The traditional industrial production of propylene basically uses petroleum-based substances as raw materials, such as steam cracking of petroleum, etc. As a non-renewable resource, oil is facing a crisis of being exhausted in the long run after years of excessive exploitation and consumption. In the short term, the price fluctuates violently due to factors such as geography, economy, and politics. A method that can replace petroleum as a raw material to produce propylene has been sought. [0003] Methanol to propylene technology is a non-petroleum resource propylene production process with great application ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/06C07C1/20C07C4/06
CPCY02P20/52
Inventor 阳永荣虞贤波王靖岱严丽霞姜坤汪燮卿
Owner ZHEJIANG UNIV