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Method for catalytically preparing 2,6-dimethylnaphthalene

A technology for the preparation of dimethylnaphthalene and catalysis, which is applied in the field of catalysis and can solve problems such as high yield of 2,6-dimethylnaphthalene, difficulty in product separation, complex process, etc., and achieve less catalyst usage and high reaction stability , high reactivity

Active Publication Date: 2018-07-31
广东和汇新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems existing in the prior art such as complicated process, low conversion rate, many by-products caused by poor selectivity of 2,6-dimethylnaphthalene, and difficulty in product separation, the present invention discloses a magnetic acidic The method for preparing 2,6-dimethylnaphthalene by ionic liquid catalysis has the advantages of high catalytic activity, simple process, high reaction conversion rate, easy recovery of catalyst and high yield of 2,6-dimethylnaphthalene.

Method used

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  • Method for catalytically preparing 2,6-dimethylnaphthalene
  • Method for catalytically preparing 2,6-dimethylnaphthalene

Examples

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Effect test

Embodiment 1

[0031] A method for the catalytic preparation of 2,6-dimethylnaphthalene is to add a mixed solution obtained by mixing α-methylnaphthalene and mesitylene in a molar ratio of 1:10 into a stirred ultrasonic reactor , Stir the reaction for 45 min under an inert atmosphere, and then add a magnetic ionic liquid catalyst at 40℃, N 2 Under the conditions of inert atmosphere, stirring speed of 400r / min and ultrasonic power of 240W, react for 50min, and let stand for 30min after the reaction is completed; the catalyst in the lower layer is directly recycled after being separated by a magnetic field; the upper layer contains a mixture of 2,6-dimethylnaphthalene After further separation and purification, 2,6-dimethylnaphthalene product and unreacted raw materials were obtained; and the content of each component was analyzed by gas chromatography. After analysis, the conversion rate of α-methylnaphthalene was 41.7%, 2 The selectivity of 6-dimethylnaphthalene is 94.2%.

[0032] The preparatio...

Embodiment 2

[0045] A method for the catalytic preparation of 2,6-dimethylnaphthalene is to add a mixed solution obtained by mixing β-methylnaphthalene and mesitylene in a molar ratio of 1:20 into a stirred ultrasonic reactor , Stir the reaction under an inert atmosphere for 35 minutes, then add a strong acidic ionic liquid, react for 80 minutes at 25℃, Ar inert atmosphere, stirring speed of 600r / min, and ultrasonic power of 150W for 80 minutes, and let stand for 30 minutes after the reaction is complete; The liquid is directly recycled after being separated by a magnetic field; the upper layer contains 2,6-dimethylnaphthalene-containing mixed liquid for further separation and purification to obtain 2,6-dimethylnaphthalene product and unreacted raw materials; and analyze each group by gas chromatography According to the analysis, the conversion rate of β-methylnaphthalene was 38.7%, and the selectivity of 2,6-dimethylnaphthalene was 95.4%.

[0046] Among them, the preparation steps of the mag...

Embodiment 3

[0048] A method for the catalytic preparation of 2,6-dimethylnaphthalene is to add α-methylnaphthalene, β-methylnaphthalene and mesitylene into a stirred ultrasonic reactor in a molar ratio of 1:1: 20. Mix the resulting mixed solution, stir and react under an inert atmosphere for 40 minutes, then add the magnetic ionic liquid, and react for 15 minutes at 35°C, He inert atmosphere, stirring speed of 500r / min, and ultrasonic power of 300W for 15 minutes. Let it stand for 30 minutes; the lower ionic liquid is directly recycled after being separated by a magnetic field; the upper layer contains 2,6-dimethylnaphthalene-containing mixed liquid for further separation and purification to obtain 2,6-dimethylnaphthalene product and unreacted raw materials; among them, The content of each component was analyzed by gas chromatography. After analysis, the conversion rate of methyl naphthalene was 45.7%, and the selectivity of 2,6-dimethyl naphthalene was 89.5%.

[0049] Among them, the prepar...

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Abstract

The invention discloses a method for catalytically preparing 2,6-dimethylnaphthalene through using magnetic ionic liquid. The method comprises the following steps of adding a mixed solution of methylnaphthalene and mesitylene in an ultrasonic reaction kettle provided with a stirrer, stirring to react for 35-45min in inert atmosphere, then adding a magnetic ionic liquid catalyst, reacting for 15-80min under the condition that temperature is 25-40 DEG C, the inert atmosphere exists, the stirring speed is 400-600r / min and the power of ultrasonic wave is 150-300W, and standing for 30min after completing reaction; a lower-layer catalyst can be directly recycled after subjected to magnetic filed separation; the mixed solution with an upper layer containing the 2,6-dimethylnaphthalene is furtherseparated and purified to obtain a 2,6-dimethylnaphthalene product and incompletely reacted raw materials. The method has the advantages of high catalytic activity, precise process, high reaction transformation rate, high 2,6-dimethylnaphthalene yield and the like.

Description

Technical field [0001] The technical field of catalysis of the present invention relates to a method for preparing 2,6-dimethylnaphthalene, in particular to a method for preparing 2,6-dimethylnaphthalene catalyzed by a magnetic ionic liquid. Background technique [0002] 2,6-Dimethylnaphthalene is an important material for the synthesis of polymer materials. After oxidation, the corresponding 2,6-naphthalenedicarboxylic acid and ethylene glycol are condensed to produce ethylene glycol 2,6-naphthalene dicarboxylate (PEN ) Is a new type of polyester material, which has better gas barrier, heat resistance, chemical stability and radiation resistance than traditional polyester materials. It can be widely used in fibers, electronic components, construction The application prospects of components, film, insulating materials, aviation and atomic energy materials are very broad. [0003] The process of preparing 2,6-dimethylnaphthalene by methylation of 2-methylnaphthalene has the advanta...

Claims

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Application Information

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IPC IPC(8): C07C2/00C07C15/24B01J31/28B01J35/10
CPCC07C2/00B01J31/0291B01J31/28C07C2531/28B01J2231/4205B01J35/33B01J35/61C07C15/24Y02P20/584
Inventor 王强
Owner 广东和汇新材料有限公司
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