Aromatic hydrocarbon ammoxidation combined fluidized bed reaction device and aromatic hydrocarbon ammoxidation combined fluidized bed reaction method

A technology of fluidized bed reactor and reaction device, which is applied in the direction of hydrocarbon ammoxidation preparation, chemical instruments and methods, organic chemistry, etc., and can solve the problem of inability to maintain production due to online emergency repair of heat extractors, reduce production process economy, and insufficient raw materials Utilize and other problems to achieve the effect of improving mass transfer and fluidization quality, improving fluidization quality and heat transfer level, and increasing the time of long-term operation

Active Publication Date: 2020-05-08
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is that in the prior art, there is a small range of adjustable heat in the reactor, and the heat collector cannot be repaired online to maintain production after being worn out, the ammonia ratio is large, the air ratio is large, raw materials are not fully utilized, and waste water The ammonia content is high, and a large amount of nitrogen is produced in the reaction process, which reduces the economical problems of the production process. A new combined fluidized bed reaction device for aromatics ammoxidation is provided. The method proposes to use at least one set of strong mixing components inside One reactor is used for lattice oxygen replenishment and heat exchange at the same time to realize the optimization of process conditions. Under the condition of ensuring the reduction of total ammonia ratio and air ratio, the heat exchange efficiency can be improved, and the heat in the reactor can be flexibly adjusted, which is convenient for the heat exchanger. Maintain and overhaul, obtain higher product yield, improve the utilization rate of raw materials, and achieve the purpose of energy saving, consumption reduction and emission reduction

Method used

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  • Aromatic hydrocarbon ammoxidation combined fluidized bed reaction device and aromatic hydrocarbon ammoxidation combined fluidized bed reaction method
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  • Aromatic hydrocarbon ammoxidation combined fluidized bed reaction device and aromatic hydrocarbon ammoxidation combined fluidized bed reaction method

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Embodiment 1

[0028] After toluene and ammonia are vaporized and air enters the dense-phase zone of the fluidized bed reactor from the gas distribution chamber, the ammoxidation reaction of aromatic hydrocarbons is carried out under the action of the catalyst; the reaction generates the corresponding benzonitrile and a small part of the catalyst leaves the reactor After the dense phase zone, it enters the dilute phase zone of the reactor. After being separated by the cyclone separator, the benzonitrile flows out of the fluidized bed reactor and is received by condensation or solvent absorption, and refined by rectification or recrystallization to obtain the product gas After being separated, the catalyst flows into the dense-phase zone of the reactor through the cyclone feed leg; after a part of the catalyst in the dense-phase zone of the reactor leaves the fluidized bed reactor, it flows into the oxygen supply heat exchanger through the circulating feed pipe under the action of the strong mi...

Embodiment 2

[0032] After toluene and ammonia are vaporized and air enters the dense-phase zone of the fluidized bed reactor from the gas distribution chamber, the ammoxidation reaction of aromatic hydrocarbons is carried out under the action of the catalyst; the reaction generates the corresponding benzonitrile and a small part of the catalyst leaves the reactor After the dense phase zone, it enters the dilute phase zone of the reactor. After being separated by the cyclone separator, the benzonitrile flows out of the fluidized bed reactor and is received by condensation or solvent absorption, and refined by rectification or recrystallization to obtain the product gas After being separated, the catalyst flows into the dense-phase zone of the reactor through the cyclone feed leg; after a part of the catalyst in the dense-phase zone of the reactor leaves the fluidized bed reactor, it flows into the oxygen supply heat exchanger through the circulating feed pipe under the action of the strong mi...

Embodiment 3

[0036] After toluene and ammonia are vaporized and air enters the dense-phase zone of the fluidized bed reactor from the gas distribution chamber, the ammoxidation reaction of aromatic hydrocarbons is carried out under the action of the catalyst; the reaction generates the corresponding benzonitrile and a small part of the catalyst leaves the reactor After the dense phase zone, it enters the dilute phase zone of the reactor. After being separated by the cyclone separator, the benzonitrile flows out of the fluidized bed reactor and is received by condensation or solvent absorption, and refined by rectification or recrystallization to obtain the product gas After being separated, the catalyst flows into the dense-phase zone of the reactor through the cyclone feed leg; after a part of the catalyst in the dense-phase zone of the reactor leaves the fluidized bed reactor, it flows into the oxygen supply heat exchanger through the circulating feed pipe under the action of the strong mi...

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Abstract

The invention relates to an aromatic hydrocarbon ammoxidation combined fluidized bed reaction device and an aromatic hydrocarbon ammoxidation combined fluidized bed reaction method. In the prior art,the heat regulation range in the reactor of the existing device is small, the heat collector cannot be repaired on line to keep production after being abraded, the ammonia ratio is large, the air ratio is large and the raw material utilization rate is low. A purpose of the invention is mainly to solve the problems in the prior art. The invention discloses an aromatic hydrocarbon ammoxidation combined fluidized bed reaction device and a reaction method thereof. According to the technical scheme, aromatic hydrocarbon/ammonia is vaporized and then enters a reactor together with air from a gas distribution chamber, an aromatic hydrocarbon ammoxidation reaction is carried out under the action of a catalyst, heat released in the reaction process is brought into an oxygen supply heat exchanger through the catalyst, efficient heat exchange is carried out under the action of a strong mixing member while catalyst lattice oxygen supplementing treatment is carried out, and then the low-temperaturehigh-lattice-oxygen catalyst circularly returns into the reactor to continuously participate in the aromatic hydrocarbon ammoxidation reaction. By adopting the technical scheme, the technical problems are well solved. The device and the method can be used in production of aromatic nitrile by aromatic ammonia oxidation.

Description

technical field [0001] The invention relates to an aromatic hydrocarbon ammoxidation combined fluidized bed reaction device and a reaction method thereof. Background technique [0002] Aromatic nitriles are a class of substances directly connected by cyano groups to aromatic rings. The cyano groups connected to the aromatic rings have high reactivity and can be produced through reactions such as hydrolysis, addition, polymerization, hydrogenation, and halogenation. It is a kind of fine chemical product, which is widely used in the fields of pesticides, medicines, dyes, food additives and polymer monomers, and is an important class of fine chemical intermediates. [0003] There are many methods for the production of aromatic nitriles, but the most simple, effective and economical method is to use the corresponding aromatic hydrocarbons, ammonia and air to carry out direct ammoxidation reaction to obtain aromatic nitrile products. The reaction of aromatics or aromatics with s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/00B01J8/28C07C253/24C07C255/50
CPCB01J8/0025B01J8/0055B01J8/28C07C253/24C07C255/50Y02P20/10Y02P20/584
Inventor 杨为民徐俊钟思青顾龙勤
Owner CHINA PETROLEUM & CHEM CORP
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