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A circulating fluidized bed reaction device for alkane dehydrogenation-cracking to olefins

A cracking reaction and reaction device technology, applied in the field of circulating fluidized bed reaction devices, can solve the problem of high energy consumption for separation, and achieve the effects of low reaction temperature, convenient equipment, and low energy consumption

Active Publication Date: 2021-11-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alkanes and alkenes cannot be separated by simple reaction or rectification. The separation of alkanes and alkenes must be achieved by extraction and separation, which requires high energy consumption for separation.

Method used

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  • A circulating fluidized bed reaction device for alkane dehydrogenation-cracking to olefins
  • A circulating fluidized bed reaction device for alkane dehydrogenation-cracking to olefins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] This embodiment refers to the attached figure 1 As shown, the alkane catalytic dehydrogenation-cracking reaction device for producing 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.

[0091] The reaction device for producing alkenes by catalytic dehydrogenation-cracking of alkanes includes a catalytic dehydrogenation-cracking reactor and a settling section 8 of the reactor, and the settling section 8 of the reactor is located at the upper part of the reactor. Wherein, the reactor includes a diameter-reducing section 7, a dehydrogenation dense-phase reaction section 6, and a cracking reaction section 5, the diameter-reducing section 7 is located above the dehydrogenation dense-phase reaction section 6, and the cracking reaction section 5 is located at the de...

Embodiment 2

[0106] Compared with Embodiment 1, this embodiment is in that the dilute phase delivery section of the reactor is connected with the cyclone 10 in the settler in a socket type. This connection method can quickly separate the catalyst from the oil and gas, which is not only beneficial to reduce the secondary reaction of olefins generated by dehydrogenation, but also reduces the partial pressure of oil and gas in the settler, which can effectively avoid coking in the settler.

experiment example 1

[0108] Pure n-butane is used as the raw material for dehydrogenation cracking, and pure propane is used as the raw material for dehydrogenation, and the mass ratio of the two feeds is 1:2. The catalyst is a non-precious metal environment-friendly catalyst produced according to ZL 2011 1012 3675.1. Experimental Examples 2-3 also all used this catalyst.

[0109] The average temperature of the dehydrocracking zone is controlled at 700°C, the average residence time of oil and gas in the dehydrocracking zone is 5s, and the superficial gas velocity of oil and gas under the actual reaction conditions in this zone is 1.7m / s.

[0110] The average temperature of the dehydrogenation zone is controlled at 600°C, the pressure of the settling section of the reactor (in terms of hydrocarbon partial pressure) is 0.042MPa, and the average residence time of oil and gas (including dehydrogenation cracked oil and gas) in the dehydrogenation zone is 8s. The superficial gas velocity under the actu...

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Abstract

A reaction device for catalytic dehydrogenation-cracking of alkanes to produce olefins, comprising a reactor for catalytic dehydrogenation-cracking and a settling section of the reactor, the settling section of the reactor is located on the upper part of the reactor, wherein the reactor includes a dehydrogenation tank A phase reaction section and a cracking reaction section, the cracking reaction section is located below the dehydrogenation dense phase reaction section, and the diameter of the cross section of the cracking reaction section is smaller than the diameter of the cross section of the dehydrogenation dense phase reaction section. The reaction device combines dehydrogenation cracking and catalytic dehydrogenation, and the overall reaction temperature and catalyst regeneration temperature are greatly reduced. The diameter of the reaction device gradually shrinks along the fluid flow direction to reduce the secondary conversion of olefins caused by back-mixing.

Description

technical field [0001] The invention relates to a circulating fluidized bed reaction device, in particular to an alkane dehydrogenation-cracking olefin circulating fluidized bed reaction device. 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 dienes. [0003] Dehydrogenat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J8/00B01J8/24C07C4/06C07C5/333C07C11/04C07C11/06C07C11/08C07C11/09
CPCB01J8/0025B01J8/004B01J8/0055B01J8/24C07C4/06C07C5/333C07C11/04C07C11/06C07C11/08C07C11/09Y02P20/584
Inventor 李春义王国玮
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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