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Production technique of propylene

A production process, propylene technology, applied in the direction of ethylene production, bulk chemical production, biological raw materials, etc., to achieve the effect of reducing sensitivity, uniform carbon deposit distribution, and high selectivity

Inactive Publication Date: 2015-02-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a production process of propylene, which mainly solves the problem of how to maintain high activity and high propylene selectivity of the MTP catalyst, and finally realizes the purpose of increasing the yield of propylene and saving energy consumption

Method used

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  • Production technique of propylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The catalyst used in this example is a ZSM-5 molecular sieve spherical catalyst with a particle size of 1.5mm-2mm, and the raw material used is methanol.

[0044] The etherification reaction zone adopts a moving bed reactor, the inlet temperature is 200°C, the operation is under normal pressure, and the mass space velocity of methanol is 20h -1 .

[0045] The OTP reaction zone adopts two moving bed reactors, the inlet temperature of the first moving bed reactor is 450°C, operated under normal pressure, and the mass space velocity of methanol is 10h -1 ; The inlet temperature of the second moving bed reactor is 450°C, operated under normal pressure, and the mass space velocity of methanol is 10h -1 ;

[0046] The intermediate quench liquid is a mixture of dimethyl ether, methanol and water produced by etherification reaction, the molar ratio of the diluent to the primary product is 3, and the diluent is water.

[0047] Transport the fresh catalyst without coke to the ...

Embodiment 2

[0051] The catalyst used in this example is a ZSM-5 molecular sieve spherical catalyst with a particle size of 1.5mm-2mm, and the raw material used is methanol.

[0052] The etherification reaction zone adopts a moving bed reactor, the inlet temperature is 230°C, it is operated under normal pressure, and the mass space velocity of methanol is 4h -1 .

[0053] The OTP reaction zone adopts four moving bed reactors, the inlet temperature of the first moving bed reactor is 470°C, operated under normal pressure, and the mass space velocity of methanol is 2h -1 , the other three are the same; the intermediate shock liquid adopts the mixture of dimethyl ether, methanol and water produced by the etherification reaction, the molar ratio of the diluent to the primary product is 10, and the diluent is water.

[0054] The catalyst with 10% carbon content is sent to the first moving bed reactor, and during the reaction, it moves to the second to fourth moving bed reactors in turn by gravi...

Embodiment 3

[0058] The catalyst used in this example is a ZSM-5 molecular sieve spherical catalyst with a particle size of 1.5mm-2mm, and the raw material used is methanol.

[0059] The etherification reaction zone adopts a moving bed reactor, the inlet temperature is 250°C, the operation is under normal pressure, and the mass space velocity of methanol is 1h -1 .

[0060] The OTP reaction zone adopts six moving bed reactors, the inlet temperature of the first moving bed reactor is 480°C, operated under normal pressure, and the mass space velocity of methanol is 0.5h -1 , the other five are the same; the intermediate cold shock liquid adopts mixtures such as dimethyl ether, methanol and water produced by etherification reaction, the molar ratio of the diluent to the primary product is 20, and the diluent is water.

[0061] The catalyst with 1.5% carbon content is transported to the first moving bed reactor, and during the reaction, it moves to the second to sixth moving bed reactors in t...

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Abstract

The invention discloses a production technique of propylene, which comprises the following steps: (1) heating the raw material methanol, introducing the methanol into an etherification reaction zone to carry out etherification reaction, and flowing through a primary carbon deposit catalyst to react, thereby obtaining a primary reaction product stream; (2) mixing the primary reaction product stream and a diluter for heat exchange, and introducing into an OTP (one tube purification) to contact a regenerated catalyst so as to carry out OTP reaction, thereby obtaining a secondary reaction product stream containing rich propylene; and (3) after carrying out heat exchange on the secondary reaction product, sending into a separation zone, dehydrating, removing oxides, and separating to obtain the propylene. The carbon deposit quantity of the catalysts used in the etherification reaction zone and OTP reaction zone can be regulated to effectively control the reaction of the etherification reaction zone and the OTP reaction zone, thereby achieving the goals of high propylene selectivity, high yield and energy saving.

Description

technical field [0001] The invention relates to a preparation method of propylene, in particular to a production process of propylene using methanol as a raw material. Background technique [0002] Propylene is an important basic chemical raw material in the modern chemical industry, and its demand is constantly increasing. The traditional production route of propylene is steam cracking and catalytic cracking of naphtha as a product of ethylene coproduction. With the depletion of oil reserves, the international crude oil price continues to rise, which leads to the continuous increase of the process cost of producing propylene from oil, thus triggering a research boom of relatively cheap methanol to propylene technology (MTP). Under the circumstances that the current crude oil price is very high and it is difficult to drop in the future, for China, which is short of oil, gas and rich in coal, MTP technology has highlighted its strong competitiveness and far-reaching strategi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/06C07C1/20
CPCY02P20/52Y02P20/584Y02P30/20Y02P30/40
Inventor 阳永荣严丽霞蒋云涛蒋斌波王靖岱廖祖维黄正梁姜坤冯翔陆飞鹏汪燮卿
Owner ZHEJIANG UNIV
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