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Circulating fluid bed reaction device for preparing olefin from alkane through catalytic dehydrogenation or catalytic cracking

A catalytic cracking and reaction device technology, applied in the field of circulating fluidized bed reaction devices, can solve the problems of difficult disposal of waste catalysts and environmental pollution, and achieve the effects of simple structure, flexible arrangement and convenient equipment

Active Publication Date: 2019-03-22
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Supported Cr-based catalysts have excellent dehydrogenation performance, but the hexavalent chromium generated by catalyst regeneration has a strong carcinogenic effect, and the production and use of catalysts may cause environmental pollution, and the disposal of spent catalysts is also a problem

Method used

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  • Circulating fluid bed reaction device for preparing olefin from alkane through catalytic dehydrogenation or catalytic cracking
  • Circulating fluid bed reaction device for preparing olefin from alkane through catalytic dehydrogenation or catalytic cracking
  • Circulating fluid bed reaction device for preparing olefin from alkane through catalytic dehydrogenation or catalytic cracking

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preparation example Construction

[0074] On the other hand, the preparation method of alkane dehydrogenation to olefins by using the above-mentioned reaction device for alkane dehydrogenation or catalytic cracking to olefins includes the following steps, the raw material enters the reaction section from the feed distributor, and the raw material and the catalyst flow upward together, The two contact to carry out catalytic reaction, wherein, in the dense-phase conveying section, the superficial gas velocity of the gas is controlled at 0.1-5.0m / s, the reaction temperature is preferably controlled between 500-730°C, and the mass space time of the reaction is 0.5~10h. In some embodiments, in the dense-phase conveying section where the catalytic dehydrogenation reaction occurs, the reaction temperature is controlled between 550°C and 630°C.

[0075] In certain embodiments, in the dense-phase conveying section where the catalytic dehydrogenation occurs, the mass space time of the reaction is 1.5-5.0 h.

[0076] In so...

Embodiment 1

[0086] This embodiment refers to the attached figure 1 As shown, the reaction device for the catalytic dehydrogenation of alkanes or catalytic cracking to olefins provided by this application is used in conjunction with the catalyst regeneration device. These two sets of devices can be used separately, and respectively used in combination with other reaction devices or catalyst regeneration devices in the prior art.

[0087] The reaction device for catalytic dehydrogenation of alkanes or catalytic cracking to produce olefins includes a reactor 4 and a settling section 8 of the reactor. The settling section 8 of the reactor is located at the upper part of the reactor 4 . The reaction section 10 includes a dilute-phase conveying section 7 , a diameter-reducing section 6 and a dense-phase conveying section 21 , the dense-phase conveying section 21 is located below the diameter-reducing section 6 , and the dilute-phase conveying section 7 is located above the diameter-reducing sec...

Embodiment 2

[0100] Compared with Embodiment 1, this embodiment has different arrangements of different catalyst risers. In this embodiment, the inclined regeneration pipe 20 extends into the reactor 4 from the side of the dense-phase conveying section 21 , and the lifting medium pipe 1 is arranged in the inclined regeneration pipe 20 inserted into the reactor 1 .

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Abstract

The invention provides a circulating fluid bed reaction device for preparing olefin from alkane through catalytic dehydrogenation or catalytic cracking. The device comprises a reactor and a reactor sedimentation section, wherein the reactor sedimentation section is positioned at the upper part of the reactor; the reactor comprises a diameter shrinkage section; the cross section diameter of the diameter shrinkage section is gradually decreased from bottom to top; a lifting pipe extends into the reactor from the lower part of the reactor; a catalyst regeneration inclined pipe is connected with the lifting pipe outside the reactor. The reaction device realizes the gradual diameter shrinkage along the fluid flowing direction; the secondary conversion of of olefin due to returning and mixing isreduced. Reactants and catalysts in the reactor realize the flow merging and upward flowing; the uniform distribution of temperature in the reactor can be effectively improved; the local high temperature is avoided.

Description

technical field [0001] The invention relates to a circulating fluidized bed reaction device, in particular to a circulating fluidized bed reaction device for alkane dehydrogenation or catalytic cracking to produce olefins. Background technique [0002] Olefins and diolefins (ethylene, propylene, butene, isobutylene, isoprene and butadiene, etc.) in synthetic resins, plastics, high-octane gasoline blending components (methyl tert-butyl ether, methyl tert-amyl Ethers and alkylated oils) and other high value-added products are widely used. In addition to these olefins, steam cracking of hydrocarbons (such as steam cracking of ethane, steam cracking of naphtha), catalytic cracking of olefins (such as Superflex technology), catalytic cracking of heavy oil (such as TMP, DCC technology) and catalytic pyrolysis of heavy oil (such as CPP technology) and other processes, the catalytic dehydrogenation of alkanes is also an important technical route for the production of olefins and di...

Claims

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Application Information

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IPC IPC(8): B01J8/00B01J8/24C07C5/333C07C11/06C07C11/10C07C4/06C07C9/04C07C9/06C07C11/04
CPCB01J8/004B01J8/0055B01J8/24C07C4/06C07C5/333C07C11/06C07C11/10C07C9/04C07C9/06C07C11/04Y02P20/584
Inventor 李春义王国玮
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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