Method for preparing butadiene by multistage oxidative dehydrogenation of butene

An oxidative dehydrogenation, butadiene technology, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve the problems of uneven catalyst temperature, poor butadiene selectivity, short regeneration cycle, etc., to improve the conversion efficiency and selectivity, increased reaction stages, and savings in product yields

Active Publication Date: 2016-01-13
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
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Problems solved by technology

[0015] The technical problem mainly solved by the present invention is the problem of uneven catalyst temperature, easy carbon deposition, short regeneration cycle and poor selectivity of butadiene in the isothermal reactor tube in the prior art existing in the prior art, and provides a new A method for preparing butadiene by isothermal oxidative dehydrogenation of butene, which has the advantages of uniform catalyst temperature in the isothermal reactor tube, less carbon deposition, long regeneration cycle and high butadiene selectivity

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  • Method for preparing butadiene by multistage oxidative dehydrogenation of butene

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Embodiment 1

[0036] A 200,000 tons / year butene oxidative dehydrogenation to butadiene plant adopts figure 1 The process technology, the reactor is two-stage, and the two-stage reactors are isothermal tubular fixed-bed reactors. The iron-based oxide catalysts are filled in the tubes of the two-stage reactors. The main components include iron, zinc, magnesium, molar The ratio is: Fe:Zn:Mg=10:3:5, prepared by co-precipitation method, the main crystal phase is ZnFe 2 o 4 Spinel, the primary reactor and the secondary reactor have the same structure, the size is Φ4500×6000mm, the tubes are Φ50×6000mm, the number of tubes is 4000, and the heat exchange area is 3900m 2 , the shell side of the primary reactor and the secondary reactor are divided into two upper and lower heat removal chambers by a partition perpendicular to the tubes. The heat removal medium is heat transfer oil. The total amount of butene is 40000kg / h, the total amount of air is 72000kg / h, the butene raw material is divided into...

Embodiment 2

[0041] A 200,000 tons / year butene oxidative dehydrogenation to butadiene plant adopts figure 1 The process technology, the reactor is two-stage, and the two-stage reactors are isothermal tubular fixed-bed reactors. The iron-based oxide catalysts are filled in the tubes of the two-stage reactors. The main components include iron, zinc, magnesium, molar The ratio is: Fe:Zn:Mg=10:3:5, prepared by co-precipitation method, the main crystal phase is ZnFe 2 o 4 Spinel, the primary reactor and the secondary reactor have the same structure, the size is Φ4500×6000mm, the tubes are Φ50×6000mm, the number of tubes is 4000, and the heat exchange area is 3900m 2 , the primary reactor and the secondary reactor shell side are divided into 4 heat removal chambers by the partitions perpendicular to the tubes. The flow rate of butene is 40000kg / h, the total amount of air is 72000kg / h, the butene raw material is divided into two parts, the flow rate of butene in the first stage is 26000kg / h, th...

Embodiment 3

[0046] A 200,000 tons / year butene oxidative dehydrogenation to butadiene plant adopts figure 1 The process technology, the reactor is two-stage, and the two-stage reactors are isothermal tubular fixed-bed reactors. The iron-based oxide catalysts are filled in the tubes of the two-stage reactors. The main components include iron, zinc, magnesium, molar The ratio is: Fe: Zn: Mg=10:4:6, prepared by co-precipitation method, the main crystal phase is ZnFe 2 o 4 Spinel, the primary reactor and the secondary reactor have the same structure, the size is Φ4500×6000mm, the tubes are Φ50×6000mm, the number of tubes is 4000, and the heat exchange area is 3900m 2 , the first-stage reactor and the second-stage reactor shell side are divided into two heat removal chambers by the partitions perpendicular to the tubes. The heat removal medium is molten salt. The temperature of the molten salt inlet is 350 ° C. 40000kg / h, the total air volume is 72000kg / h, the butene raw material is divided i...

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Abstract

The present invention relates to a method for preparing butadiene through multi-stage oxidative dehydrogenation of butene, wherein problems of non-uniform catalyst temperature in an isothermal reactor tube alignment, easy carbon deposition, short regeneration period and poor butadiene selectivity in the prior art are mainly solved. According to the present invention, the technical scheme comprises that: at least double stages of isothermal reactors are connected in series, all the steam is added from the first-stage reactor, the raw material butene and oxygen-containing gas are added to various stages of the reactors at sections, various stages of the reactors are tubular isothermal reactors, catalysts are filled inside the tube alignments, the shell side outside the tube alignment is separated into 1-M heat dissipating chambers by using separation plates perpendicular to the tube alignment direction, the heat dissipating chambers are not communicated, M is an integer of more than or equal to 2, the heat dissipating chambers are respectively communicated with external heat dissipating mediums, various heat dissipating chamber catalyst layers are provided with temperature measurement devices, and the temperatures of the catalyst layers in various heat dissipating chamber tube alignments are controlled through respectively adjusting the flow rates of the heat dissipating mediums communicated with various heat dissipating chambers. With the technical scheme, the problems are well solved, and the method can be used for industrial production of butadiene preparation through oxidative dehydrogenation of butene.

Description

technical field [0001] The invention relates to a method for preparing butadiene by multistage oxidative dehydrogenation of butene. Background technique [0002] Butadiene is an important monomer of synthetic rubber and synthetic resin, mainly used in the synthesis of butadiene rubber, styrene-butadiene rubber, nitrile rubber and ABS resin. Butadiene is also a variety of coatings and organic chemical raw materials. [0003] At present, butadiene is mainly produced in two ways: separation of C4 fractions and synthesis (including butane dehydrogenation, butene dehydrogenation, butene oxidative dehydrogenation, etc.). At present, except the United States, almost all butadiene in the world comes directly from the by-product C4 fraction (also written as C4 fraction) when hydrocarbon cracking is used to produce ethylene. About half of the sources of butadiene in the United States come from the dehydrogenation of butane and butene, and half come directly from cracking C4 fraction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C11/167C07C5/48
Inventor 刘文杰杨为民
Owner CHINA PETROLEUM & CHEM CORP
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