A kind of technology that utilizes fixed-bed reactor to produce propylene

A fixed bed reactor and reactor technology, applied in the field of propylene production, to achieve the effects of reducing the difficulty of heat exchange, increasing the yield of propylene, and high product selectivity

Inactive Publication Date: 2015-08-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a process for producing propylene by using a fixed-bed reactor and a fixed-bed reactor matched with the process, aiming to solve the problem of methanol and C 4 or C 4 / C 5 Comprehensive Utilization of Fractions

Method used

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  • A kind of technology that utilizes fixed-bed reactor to produce propylene

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Effect test

Embodiment 1

[0036] The ZSM-5 that chooses phosphorus-iron modification is catalyst A, and the ZSM-5 that lanthanum modifies is catalyst B, and preparation method is as follows:

[0037] The required raw materials are HZSM-5 molecular sieve (Si:Al=50), binder, phosphoric acid, ferric nitrate, lanthanum nitrate aqueous solution, mix HZSM-5 molecular sieve and binder at a ratio of 3:1, and form it by extrusion Strip-shaped HZSM-5 molecular sieves were obtained by the impregnation method, and ZSM-5 molecular sieve catalysts containing 1.5% phosphorus and 1% iron were obtained by impregnation, and ZSM-5 catalysts containing 1.5% lanthanum were obtained. Additives can be added as appropriate during the preparation process.

[0038] The bed temperature in area A of the fixed bed reactor is 430°C, the bed temperature in area B is 450°C, the pressure is 0.13Mpa, and the mass space velocity is 1.2h -1 . C 4 / C 5 The distillate is mixed with methanol and water vapor at a mass ratio of 2:3:12 for ...

Embodiment 2

[0041] Choose phosphorus-nickel modified ZSM-5 as catalyst A, phosphorus-lanthanum modified ZSM-5 as catalyst B, and the preparation method is as follows:

[0042] The required raw materials are HZSM-5 molecular sieve (Si:Al=50), binder, phosphoric acid, nickel nitrate, lanthanum nitrate aqueous solution, mix HZSM-5 molecular sieve and binder at a ratio of 3:1, and form by extrusion strip-shaped HZSM-5 molecular sieve obtained by the impregnation method, and the ZSM-5 molecular sieve catalyst containing 1.5% phosphorus and 1% nickel was obtained by the impregnation method, and the ZSM-5 catalyst containing 1.5% phosphorus and 1% lanthanum was obtained during the preparation process. Add additives.

[0043] The bed temperature in reactor area A is 440°C, the bed temperature in reactor area B is 460°C, the pressure is 0.16Mpa, and the mass space velocity is 1h -1 . C 4 / C 5 The distillate is mixed with methanol and water vapor in a mass ratio of 1:1:4 and then injected from ...

Embodiment 3

[0046] Choose phosphorus-nickel modified ZSM-5 as catalyst A, phosphorus-magnesium modified ZSM-5 as catalyst B, and the preparation method is as follows:

[0047] The required raw materials are HZSM-5 molecular sieve (Si:Al=50), binder, phosphoric acid, nickel nitrate, and magnesium nitrate aqueous solution. Mix HZSM-5 molecular sieve and binder in a ratio of 3:1, and form it by extrusion Strip-shaped HZSM-5 molecular sieves were obtained by the impregnation method, and ZSM-5 molecular sieve catalysts containing 1.5% phosphorus and 1% nickel were obtained by the impregnation method, and ZSM-5 catalysts containing 1.5% phosphorus and 2% magnesium were obtained during the preparation process. Add additives.

[0048] The bed temperature in reactor area A is 450°C, the bed temperature in reactor area B is 470°C, the pressure is 0.18Mpa, and the mass space velocity is 1.5h -1 . C 4 / C 5 The distillate is mixed with methanol and water vapor in a mass ratio of 1:2:8 and then inj...

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Abstract

The invention discloses a technology for production of propylene by a fixed bed reactor. The fixed bed reactor falls into an area A and an area B. A catalyst A is disposed in the area A and a catalyst B is disposed in the area B. The propylene production technology includes: introducing a feed gas 1 into the area A to undergo contact reaction with the catalyst A, thus generating a first product flow; subjecting a feed gas 2 to mixing and heat exchange with the first product flow, then introducing the gas into the area B to undergo contact reaction with the catalyst B, thus generating a secondary product flow; treating the secondary product flow to obtain propylene and a hydrocarbon by-product; and carrying out crude separation on the C4 or C4 / C5 fraction in the hydrocarbon by-product, and then returning the C4 or C4 / C5 fraction to the area A and the area B. The technology makes use of the co-refining reaction of methanol and / or dimethyl ether and C4 or C4 / C5 fraction to increase the yield of propylene, the strong heat effects generated by individual production of propylene from the two materials can be neutralized, and the heat exchange difficulty is reduced. At the same time, through a double reaction area design, the yield of propylene is increased, and high selectivity of propylene is ensured.

Description

technical field [0001] The invention relates to the technical field of propylene production, in particular to a process for producing propylene with a fixed-bed reactor. Background technique [0002] Low-carbon hydrocarbons such as ethylene and propylene are the basis of the modern chemical industry. In recent years, the demand for low-carbon hydrocarbons and their downstream products has grown rapidly, among which the growth rate of propylene demand is significantly higher than that of ethylene, and there is an obvious gap between supply and demand. The traditional production of propylene relies on petroleum and its derivatives, and the continuous rise in international oil prices leads to high production costs of propylene. On the other hand, the way of co-production of ethylene plant and by-product of refinery is constrained by the production of ethylene and fuel oil, so the stable supply of propylene cannot be guaranteed. Breaking through the single source of propylene ...

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 王靖岱王中仁廖祖维蒋斌波黄正梁阳永荣季来军蒋云涛严丽霞陆飞鹏冯翔
Owner ZHEJIANG UNIV
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