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Fluidized bed continuous reaction regeneration system and method for converting C3-C9 alkane into aromatic hydrocarbon

A technology of C3-C9, reaction regeneration

Active Publication Date: 2022-03-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason is that the conversion of alkanes to aromatics is a high-temperature and strong endothermic reaction, which consumes a lot of energy for heating.
At the same time, due to the slow generation rate of aromatics, as long as the raw material processing capacity is increased, a large amount of olefin intermediates will be generated, and there is a complex and energy-intensive separation of alkanes and olefins.
At present, although there are also reports on the preparation of aromatics from methanol, methanol has high activity, is easy to convert, and is an exothermic reaction. The reaction temperature is not as harsh as the aromatization of alkanes.

Method used

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  • Fluidized bed continuous reaction regeneration system and method for converting C3-C9 alkane into aromatic hydrocarbon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Will C 3 -C 9 The two-stage fluidized bed (1) for producing aromatics from alkanes is connected with the catalyst regeneration fluidized bed (2) with pipelines to form a complete system; the C 3 -C 9 The catalyst for producing aromatics from alkanes (2% gallium oxide-3% yttrium oxide-75% ZSM-5-20% β molecular sieve) is loaded into C 3 -C 9 In the two-stage fluidized bed (1) for producing aromatics from alkanes and the catalyst regeneration fluidized bed (2), first realize the smooth circulation flow of the catalyst in the system;

[0035] Hot air is passed into the catalyst regeneration fluidized bed (2) so that the temperature in the catalyst regeneration fluidized bed (2) reaches 600°C. In an atmosphere that ensures the safety of the system, the catalyst in the catalyst regeneration fluidized bed (2) is circulated to C 3 -C 9 In the two-stage fluidized bed (1) for preparing aromatics from alkanes, the temperature of the two-stage fluidized bed is gradually incre...

Embodiment 2

[0042] Will C 3 -C 9 The two-stage fluidized bed (1) for producing aromatics from alkanes is connected with the catalyst regeneration fluidized bed (2) with pipelines to form a complete system; the C 3 -C 9 The catalyst for producing aromatics from alkanes (3% zinc oxide-0.3% lanthanum oxide-1% chromium oxide-24% ZSM-5-20% Y molecular sieve-51.7% SBA-15) is loaded into C 3 -C 9 In the two-stage fluidized bed (1) for producing aromatics from alkanes and the catalyst regeneration fluidized bed (2), first realize the smooth circulation flow of the catalyst in the system;

[0043] Hot air was passed into the catalyst regeneration fluidized bed (2) so that the temperature in the catalyst regeneration fluidized bed (2) reached 720°C. In an atmosphere that ensures the safety of the system, the catalyst in the catalyst regeneration fluidized bed (2) is circulated to C 3 -C 9 In the two-stage fluidized bed (1) for preparing aromatics from alkanes, the temperature of the two-stage...

Embodiment 3

[0050] Will C 3 -C 9 The two-stage fluidized bed (1) for producing aromatics from alkanes is connected with the catalyst regeneration fluidized bed (2) with pipelines to form a complete system; the C 3 -C 9 Catalyst for producing aromatics from alkanes (1% gallium oxide-45% ZSM-22-20% MCM-41-34% MCM-22) loaded into C 3 -C 9 In the two-stage fluidized bed (1) for producing aromatics from alkanes and the catalyst regeneration fluidized bed (2), first realize the smooth circulation flow of the catalyst in the system;

[0051] Pass hot air into the catalyst regeneration fluidized bed (2) so that the temperature in the catalyst regeneration fluidized bed (2) reaches 650°C. In an atmosphere that ensures the safety of the system, the catalyst in the catalyst regeneration fluidized bed (2) is circulated to C 3 -C 9 In the two-stage fluidized bed (1) for preparing aromatics from alkanes, the temperature of the two-stage fluidized bed is gradually increased.

[0052] When C 3 -C...

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Abstract

The invention discloses a fluidized bed continuous reaction regeneration system and method based on C3-C9 alkane to aromatic hydrocarbon in the technical field of chemical process and equipment, and the system comprises a two-section fluidized bed for C3-C9 alkane to aromatic hydrocarbon (from bottom to top, the two-section fluidized bed has a first reaction zone and a second reaction zone for respectively controlling the temperature so as to complete the functions of high-temperature light hydrocarbon aromatization and medium-temperature olefin aromatization; meanwhile, a liquid aromatic hydrocarbon (benzene or / and toluene) feeding hole is formed in the lower part of the second reaction area, and the temperature of the second reaction area is controlled through liquid vaporization). The connection relationship between the two fluidized beds is that after the catalyst in the two fluidized beds is inactivated, the catalyst enters the catalyst regeneration fluidized bed from the first reaction zone, is regenerated and then returns to the first reaction zone of the two fluidized beds; the system and the method have the characteristics of high alkane conversion rate, high aromatic hydrocarbon yield and simple temperature control.

Description

technical field [0001] The invention belongs to the technical field of chemical process and equipment, and specifically relates to a C 3 -C 9 Fluidized bed reaction regeneration system, reactor and regenerator structure and method for alkanes to aromatics. Background technique [0002] C 3 -C 9 A mixture of alkanes. With the expansion of the device, its output increases year by year. Because it is a mixture (such as raffinate, light naphtha), there are many isomers, and it is difficult to separate again, so the added value is not high. With the lightening of ethylene raw materials and excess fuel use, coupled with the pressure of carbon emission reduction, it is increasingly necessary to find new processing channels for such raw materials. [0003] Aromatic hydrocarbons are important chemical platform compounds, which can continue to prepare various high-performance plastics, pharmaceuticals and pesticides and other fine chemical products. Aromatics are traditionally ...

Claims

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Application Information

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IPC IPC(8): B01J8/26C07C5/41C07C2/84B01J38/12C07C15/04C07C15/06
CPCB01J8/26C07C2/84C07C5/412B01J38/12C07C15/04C07C15/06Y02P20/52Y02P20/584
Inventor 崔超婕骞伟中王宏梅
Owner TSINGHUA UNIV
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