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System and process for producing 1,2,4,5-tetramethylbenzene by using ejection-circulation methanol-aromatic hydrocarbon methylation reaction

A technology of mesitylene and methylation, used in catalysts, organic chemistry, hydrocarbons, etc., can solve the problems of high price, unsuitable for industrialized large-scale production, etc., and achieve low cost of raw materials, easy procurement, and inhibition of alkylation. effect of reaction

Active Publication Date: 2020-01-14
潍坊弘润新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN201711464535.4 discloses a method for producing durene by alkylation of mesitylene and its reactor. The reactor adopts a radial fixed-bed reactor with a distributor, and the reaction conversion rate is high, but the aromatic hydrocarbon used in this patent It is trimethylbenzene, which is expensive and not suitable for large-scale industrial production

Method used

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  • System and process for producing 1,2,4,5-tetramethylbenzene by using ejection-circulation methanol-aromatic hydrocarbon methylation reaction
  • System and process for producing 1,2,4,5-tetramethylbenzene by using ejection-circulation methanol-aromatic hydrocarbon methylation reaction

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Effect test

Embodiment 1

[0060] A system for the production of durene by injection cycle methanol aromatics methylation, such as figure 1 As shown, it includes a methanol pump 1 , a reactor 3 , a heat exchange system 4 and a separation and refining system 5 .

[0061] An outlet product heat exchanger 3-1, a mixer 3-2, an overheating heat exchanger 3-3, a nozzle 3-4, an ejector 3-5, and a catalyst bed 3-6 are installed in the reactor. The reactor 3 is divided into a product chamber 3-0 and an inlet chamber 3-7 by a catalyst bed 3-6, and the catalyst bed 3-6 adopts an axial flow catalyst bed. A heating device is arranged inside the catalyst bed 3-6. The catalyst bed layer 3-6 is provided with an inlet channel, and the inlet channel communicates with the product chamber 3-0 and the inlet chamber 3-7. A product heat exchanger 3-1, a mixer 3-2, a superheater heat exchanger 3-3, a nozzle 3-4, and an ejector 3-5 are arranged in the product chamber 3-0. The outlet of the ejector 3-5 is connected to the inl...

Embodiment 2

[0066] A system for the production of durene by injection cycle methanol aromatics methylation, such as figure 2 As shown, it is the same as in Example 1, except that the catalyst bed adopts a radial flow catalyst bed, and outlet channels 3-8 are arranged between the catalyst bed and the reactor wall.

Embodiment 3

[0068] Adopt the system of embodiment 1, the raw material is the technique that the injection circulation methylation reaction of methyl alcohol and toluene produces durene as follows:

[0069] The methanol raw material from the raw material methanol pump 1 and the methanol feed valve 2, at a temperature of 25°C and a pressure of 2.0 MPa, passes through the reactor 3 and enters the outlet product heat exchanger 3-1 in the product chamber 3-0, and is transferred from the catalyst bed The reaction product coming out of the outlet is heated and evaporated to about 200°C, and part of the product is cooled to about 280°C at the same time. Part of the high boiling point component in the product is condensed and sinks, and then mixed with part of the gaseous product and discharged from the reactor. The raw material methanol vapor passes through the mixer 3 -2 is mixed with raw aromatics circulating aromatics confluence gas to form a mixed gas. In the mixed gas, the molar ratio of raw ...

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Abstract

The invention provides a system and process for producing 1,2,4,5-tetramethylbenzene by using an ejection-circulation methanol-aromatic hydrocarbon methylation reaction. The system includes a reactor,a methanol pump and a raw material methyl aromatic hydrocarbon pump, wherein a catalyst bed layer is arranged in the reactor, the space of the reactor is divided into a product chamber and an inlet chamber through the catalyst bed layer, and an inlet channel is arranged in the catalyst bed layer; the inlet channel communicates with the product chamber and the inlet chamber, an ejector and a nozzle are installed in the product chamber, and the outlet of the ejector is connected with the inlet channel; and the nozzle is formed in the inlet of the ejector, and both the outlet of the methanol pump and the outlet of the raw material methyl aromatic hydrocarbon pump are connected with the inlet of the nozzle. Methanol, toluene, mixed xylene, pseudocumene and other bulk chemicals can be adoptedas raw materials, and can be applied directly to a methylation reaction for large-scale production of high-quality 1,2,4,5-tetramethylbenzene.

Description

technical field [0001] The disclosure belongs to the fields of coal chemical industry, petrochemical industry and fine chemical industry, and relates to the production of durene, in particular to a system and process for producing durene by methylation reaction of methylated methylated methylated cyclic methanol. Background technique [0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] In recent years, with the rapid development of aerospace and high-end electronic product industries, the market demand for durene, especially high-quality durene, continues to expand. Durene, also known as 1,2,4,5-tetramethylbenzene (1,2,4,5-tetramethylbenzene), is an important fine chemical raw material, mainly used in the production of pyromellitic dianhydride, referred to as anhydride. Homoanhydride is an important raw material for the synthesis of high-performance polymer materials po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J8/02C07C2/86C07C15/02
CPCB01J8/02B01J8/0214B01J8/0257B01J8/0278B01J8/0285B01J2208/00115B01J2208/00274B01J2208/00548B01J2208/00902C07C2/864C07C2529/40C07C15/02
Inventor 曲延涛张范赵汝臣朱文聪韩光涛李万强
Owner 潍坊弘润新材料有限公司
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