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Alkylation reaction system and method for aromatic hydrocarbons with more than 8 carbon atoms

An aromatic hydrocarbon alkylation and reaction system technology, which is applied in chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of low reaction conversion rate, high reaction temperature, short catalyst life, etc., and achieves a simple method. Easy to operate, improve service life, prevent overheating

Pending Publication Date: 2022-03-15
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a reaction system and method for the alkylation of aromatic hydrocarbons with carbon eight or more, which solves the problems of excessively high reaction temperature, short catalyst life and low reaction conversion rate that tend to occur in the traditional process

Method used

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  • Alkylation reaction system and method for aromatic hydrocarbons with more than 8 carbon atoms

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Experimental program
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Effect test

Embodiment 1

[0039] use as figure 1Shown reaction system, get industrial product 2-methylnaphthalene (purity 99%) and methyl alcohol (purity 99%) to configure mixed solution with molar ratio 4:1, then adopt feed pump to pump with the speed of 1 gram / minute The reaction is carried out in a fixed bed reactor, the reaction temperature is controlled at 255° C., and the reaction pressure is controlled at 3.0 MPa, so that the reaction in the fixed bed reactor is a liquid phase reaction. The fixed bed reactor was prepacked with 10 grams of dried ZSM-5 catalyst. The reaction product enters the circulating flash evaporator, the temperature of the circulating flash evaporator is 250° C., and the pressure is 1.0 MPa. The water vapor is discharged from the circulating flash evaporator, and part of the obtained flash liquid phase product is discharged from the system in the form of reaction discharge, and the other part is used as a circulating liquid and enters the reactor together with the reaction ...

Embodiment 2

[0051] use as figure 1 Shown reaction system, get industrial product 1-methylnaphthalene (purity 99%) and methyl alcohol (purity 99%) to configure mixed solution with molar ratio 4:1, then adopt feed pump to pump with the speed of 1 g / min The reaction is carried out in a fixed bed reactor, the reaction temperature is controlled at 270° C., and the reaction pressure is controlled at 3.0 MPa, so that the reaction in the fixed bed reactor is a liquid phase reaction. The fixed bed reactor was prepacked with 10 grams of dried MCM-22 catalyst. The reaction product enters the circulating flash evaporator, the temperature of the circulating flash evaporator is 240°C, and the pressure is 1.0MPa. The water vapor is discharged from the circulating flash evaporator, and part of the obtained flash liquid phase product is discharged from the system in the form of reaction discharge, and the other part is used as a circulating liquid and enters the reactor together with the reaction raw mat...

Embodiment 3

[0063] use as figure 1 In the reaction system shown, take the industrial product mixed methylnaphthalene (except for methylnaphthalene, the other components are less than 1%) to configure a mixed solution with a molar ratio of 5:1, and then use a feed pump at a speed of 2 g / min. Pump into a fixed bed reactor for reaction, the reaction temperature is controlled at 270° C., and the reaction pressure is controlled at 2.0 MPa, so that the reaction in the fixed bed reactor is a liquid phase reaction. The fixed bed reactor was prepacked with 20 grams of dried Beta catalyst. The reaction product enters the circulating flash evaporator, the temperature of the circulating flash evaporator is 240°C, and the pressure is 1.0MPa. The water vapor is discharged from the circulating flash evaporator, and part of the obtained flash liquid phase product is discharged from the system in the form of reaction discharge, and the other part is used as a circulating liquid and enters the reactor tog...

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Abstract

The invention relates to an alkylation reaction system and method for aromatic hydrocarbons with more than 8 carbon atoms. The system comprises: a reactor comprising a feed port and a discharge port; the circulating flash evaporator comprises a feed port, a water vapor outlet and a discharge port; wherein a feed port of the circulating flash evaporator is connected with a discharge port of the reactor; and a discharge port of the circulating flash evaporator is connected with a feed port of the reactor and is used for circulating part of the flash evaporation liquid phase product back to the reactor. When the reaction system is used for carrying out alkylation reaction on C8 or above aromatic hydrocarbon, the problems that the reaction temperature is too high, the service life of the catalyst is short and the reaction conversion rate is not high easily occurring in the traditional process are solved.

Description

technical field [0001] The invention relates to an alkylation reaction system and method, in particular to an alkylation reaction system and method for aromatic hydrocarbons with carbon eight or more. Background technique [0002] Dimethylnaphthalene is mainly used in the production of 2,6-ethylene naphthalate, and 2,6-ethylene naphthalate is used to prepare high-performance polymer PEN (polyethylene naphthalate). One of the raw materials. Durene is mainly used to produce pyromellitic dianhydride, which is one of the raw materials for preparing high-performance polymer polyimide. In the prior art, methods such as: C12 heavy aromatics crystallization separation method, methylnaphthalene isomerization disproportionation method, mesitylene side chain alkylation method, and methylnaphthalene methanol alkylation method are generally used to prepare dimethylnaphthalene; C10 heavy aromatics crystallization separation method, trimethylbenzene isomerization disproportionation metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/02C07C2/86
CPCC07C2/864C07C15/02
Inventor 刘远林高焕新胥明王闻年季树芳
Owner CHINA PETROLEUM & CHEM CORP