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Low energy consumption propylene production technology

A production process and low energy consumption technology, applied in ethylene production, bulk chemical production, biological raw materials, etc., can solve the problems of high propylene yield and selectivity, achieve high selectivity, control temperature rise, and increase outlet temperature. Effect

Inactive Publication Date: 2013-10-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a low-energy-consumption propylene production process, which mainly solves the problem that a large amount of steam water needs to be ensured in the MTP process in the prior art to obtain high propylene yield and selectivity

Method used

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  • Low energy consumption propylene production technology

Examples

Experimental program
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Effect test

Embodiment 1

[0031] The catalyst used in this example is a ZSM-5 molecular sieve spherical or strip catalyst with a particle size of 1.0-3.0 mm. The raw material used is methanol, and the diluent gas is a mixture of methane and ethane. The molar ratio between the two is 2. :8, the molar ratio of diluent gas to methanol is 3:1.

[0032] The etherification reaction zone adopts a fixed bed reactor, the inlet temperature is 180°C, the outlet temperature is 220°C, the pressure is normal pressure, and the mass space velocity of methanol is 25h -1 . The molar ratio of refining hydrocarbons to primary products is 0.5:1, and the molar ratio of steam water to primary products is 4:1.

[0033] The OTP reaction zone adopts a fixed bed reactor with an inlet temperature of 440°C, operated under normal pressure, and a methanol mass space velocity of 12h -1 . The material in the reactor is contacted with the catalyst with 15% pre-coke, and the temperature of the outlet product stream is 480 ° C. After ...

Embodiment 2

[0036] The catalyst used in this example is ZSM-5 molecular sieve spherical catalyst with a particle size of 1.0-2.5 mm. The raw material used is methanol, the diluent gas is methane, and the molar ratio of diluent gas to methanol is 3:1.

[0037] The etherification reaction zone adopts a moving bed reactor with an inlet temperature of 230°C, an outlet temperature of 260°C, a pressure of 1.8MPa, and a methanol mass space velocity of 10h -1 . The output product of the etherification reactor is divided into two streams A and B, the mass ratio is 1:1, and the recycled hydrocarbon and steam water are mixed with the first stream of etherification reactor outlet product A, of which the recycled hydrocarbon and stream A The molar ratio of the mixture of methanol, dimethyl ether and water in stream A is 2.0:1, and the molar ratio of steam water to the mixture of methanol, dimethyl ether and water in stream A is 2:1.

[0038] The OTP reaction zone adopts two moving bed reactors, the i...

Embodiment 3

[0041] The catalyst used in this example is a ZSM-5 molecular sieve spherical catalyst with a particle size of 1.0-2.5 mm. The raw material used is methanol, and the diluent gas is methane and butane. The molar ratio of the three is 6:1 in sequence. The diluent gas and The molar ratio of methanol is 5:1.

[0042] The etherification reaction zone adopts a moving bed reactor with an inlet temperature of 260°C, an outlet temperature of 300°C, a pressure of 2.1MPa, and a methanol mass space velocity of 5h -1 . Divide the output product of the etherification reactor into three strands A, B, and C, with a mass ratio of 2:3:5, and mix the recycled hydrocarbon and steam water with the first etherification reactor outlet product A, in which the recycled hydrocarbon and The molar ratio of the mixture of methanol, dimethyl ether and water in stream A is 10:1, and the molar ratio of steam water to the mixture of methanol, dimethyl ether and water in stream A is 1:1.

[0043] The OTP rea...

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Abstract

The invention discloses a low energy consumption propylene production technology, which comprises the following steps of (1) after mixing raw material methyl alcohol and diluent gas, carrying out etherification reaction, after mixing the primary product and the stream of the diluent gas with steam water and refined hydrocarbon and heat exchanging, preparing olefin so as to obtain a secondary product; (2) separating the secondary product so as to obtain propylene, ethylene, C1-C3 alkane, C4-C6 components comprising olefin and alkane, C7 and heavy components comprising arene; and (3) taking the vaporized purified water obtained through separation as part of the steam water and circulating to step (1), taking the products of ethylene, C1-C2 alkane, C4-C6 as the refined hydrocarbon, and returning to an OTP (one time programmable) reactor for preparing olefin continuously. According to the preparation method, the problem that high propylene yield needs a large amount of steam water and the problem of selectivity in the MTP (methanol to propylene) technology are solved, and the purposes of water saving and energy saving are finally realized through comprehensive regulation of diluent gas, refined hydrocarbon and catalyst carbon deposit quantity.

Description

technical field [0001] The invention relates to a method for preparing propylene, in particular to a propylene production process using methanol or dimethyl ether as a raw material and capable of saving water and energy. 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, international crude oil prices continue to rise, leading to rising costs of producing propylene from oil, and the low-cost ethane resources in the Middle East make the path of ethane dehydrogenation to ethylene more convenient than the naphtha route. With market competitiveness, it once again impacted the production source of propylene, and finally triggered a research boom of the relatively cheap coal chemical route - methanol to p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C11/06C07C1/20
CPCY02P20/52Y02P30/20Y02P30/40
Inventor 阳永荣严丽霞蒋斌波王靖岱廖祖维汪燮卿蒋云涛冯翔陆飞鹏
Owner ZHEJIANG UNIV
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