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Radial fixed bed reactor for oxy-dehydrogenation of butylene

A radially fixed bed, oxidative dehydrogenation technology, applied in chemical instruments and methods, organic chemistry, hydrocarbons, etc., can solve the problem of low butene conversion selectivity, uneven fluid distribution, large reactor pressure drop, etc. problems, to achieve the effect of improving conversion rate and selectivity, uniform gas distribution, and improving reaction conversion rate

Inactive Publication Date: 2013-05-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The technical problems mainly solved by the present invention are the problems of large reactor pressure drop, uneven fluid distribution and low selectivity of butene conversion existing in the prior art

Method used

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  • Radial fixed bed reactor for oxy-dehydrogenation of butylene
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  • Radial fixed bed reactor for oxy-dehydrogenation of butylene

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A 100,000 tons / year butene oxidative dehydrogenation to butadiene plant, the reactor adopts figure 1 The structural type of the reactor is a cylindrical container composed of an upper head, a cylindrical shell and a lower head. The upper head of the reactor is provided with a feed port, and a gas pre-distributor is provided in the feed port. The lower head of the reactor is provided with a discharge port and a catalyst discharge port; in the cylindrical shell of the reactor, a fan-shaped tube distributor, a catalyst bed, and a porous wall tube in the center are arranged in sequence from the outside to the inside; the fan-shaped tube The distributor is composed of a plurality of circularly arranged fan-shaped cylinders uniformly arranged along the inner wall of the reactor shell. The fan-shaped cylinder distributor adopts the form of uniform opening or segmented opening porosity, and its fan-shaped surface is close to the catalyst side, and Open distribution holes, commu...

Embodiment 2

[0037] A 100,000 tons / year butene oxidative dehydrogenation to butadiene plant, the reactor adopts figure 1 The structural type of the reactor is a cylindrical container composed of an upper head, a cylindrical shell and a lower head. The upper head of the reactor is provided with a feed port, and a gas pre-distributor is provided in the feed port. The lower head of the reactor is provided with a discharge port and a catalyst discharge port; in the cylindrical shell of the reactor, a fan-shaped tube distributor, a catalyst bed, and a porous wall tube in the center are arranged in sequence from the outside to the inside; the fan-shaped tube The distributor is composed of a plurality of circularly arranged fan-shaped cylinders uniformly arranged along the inner wall of the reactor shell. The fan-shaped cylinder distributor adopts the form of uniform opening or segmented opening porosity, and its fan-shaped surface is close to the catalyst side, and Open distribution holes, commu...

Embodiment 3

[0041] A 100,000 tons / year butene oxidative dehydrogenation to butadiene plant, the reactor adopts figure 1 The structure type, the raw material mixture enters the gas distributor 2 with a conical single-stage baffle 13 from the feed port 1, and then enters the fan-shaped cylinder distributor 6 located on the outer ring of the reactor, and the reaction gas passes through the hole fan-shaped cylinder distributor The distribution holes on the top enter the catalyst bed 5, and the top of the catalyst bed 5 is provided with ceramic balls 4 and a cover plate 12. The reactant gas flows out of the catalyst bed and enters the inner porous wall cylinder 7, and finally flows out of the reactor through the discharge port 9.

[0042] The feed air volume is 36000 kg / h, the butene raw material is 20000 kg / h, the reaction feed temperature is 320°C, the discharge temperature is 480°C, the pressure is 0.12MPa, the reactor diameter is 3200mm, the catalyst bed is 6000mm high and 650mm thick, and ...

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Abstract

The invention relates to a radial fixed bed reactor for oxy-dehydrogenation of butylene. The radial fixed bed reactor mainly solves the problems that the pressure drop of the reactor is high, fluid distribution is nonuniform, a raw material conversion rate is low, and product selectivity is low in the prior art. The radial fixed bed reactor adopts a centripetal Z-shaped structure and is a cylindrical vessel with a catalyst bed; a feed port is located at the top of the reactor; a discharge port is located at the bottom of the reactor; a gas predistributor with a conical single-stage baffle is arranged at the feed port; the catalyst bed consists of a fan-shaped barrel distributor located at an outer ring and a porous wall barrel located at an inner ring; a catalyst is filled in the catalyst bed; a cover plate sealing structure is arranged at the top of the catalyst; the fan-shaped barrel distributor can be in a porosity-variable or Johnson screen structural form; and the porous wall barrel at the inner ring consists of an inner layer center porous barrel, an intermediate layer punched plate and an outer layer screen. The radial fixed bed reactor solves the problems better and can be used for industrial production of preparing butadiene through the oxy-dehydrogenation of butylene.

Description

technical field [0001] The invention relates to a radial fixed-bed reactor for 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] Oxidative dehydrogenation of butene is currently a relatively competitive process technology for producing butadiene. Butadiene is produced by oxidative dehydrogenation of butene in the presence of water vapor, using oxygen to combine with hydrogen in butene molecules to obtain butadiene and structurally stable water. This reaction is basically irreversible. The main reaction equation is as follows: [0004] [0005] Other side effects mainly include: [0006] [0007] [0008] The main factors affecting the oxidative dehydrogenation of butene are reaction ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/02C07C11/167C07C5/48
Inventor 黄云群刘文杰
Owner CHINA PETROLEUM & CHEM CORP
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