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Production method of 2,6-dimethoxynaphthalene

A technology of dimethoxynaphthalene and a production method, which is applied in the directions of ester reaction to prepare ether, ether preparation, organic chemistry, etc., can solve the problems of long reaction time and low yield, and achieves low reaction conditions and high product yield. , the effect of simple process route

Inactive Publication Date: 2006-01-25
南通莱嘉利化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. So far, no other unit in China has researched or produced 2,6-dimethoxynaphthalene
[0004] 2. In foreign countries, 2,6-dihydroxynaphthalene is generally synthesized by directly reacting with dimethyl sulfate in lye, and the reaction time is long and the yield is low.

Method used

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  • Production method of 2,6-dimethoxynaphthalene
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  • Production method of 2,6-dimethoxynaphthalene

Examples

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Effect test

Embodiment 1

[0014] A kind of production method of 2,6-dimethoxynaphthalene, 2,6-dihydroxynaphthalene is dissolved in alcoholic solvent (such as methyl alcohol, ethanol, isopropanol), under alkaline condition (add alkali solution for Potassium hydroxide or sodium hydroxide) slowly add dimethyl sulfate solution and react at 20-70°C (such as 20°C, 30°C, 40°C, 50°C, 60°C, 70°C) for 3-6 Hour (as 3, 3.5, 4, 4.5, 5, 5.5, 6 hours) generates 2,6-dimethoxynaphthalene, and its reaction formula is:

[0015]

[0016] The amount of alcohol solvent is based on the complete dissolution of the raw material 2,6-dihydroxynaphthalene, the purity of the used 2,6-dihydroxynaphthalene is ≥98%, and the concentration of sodium hydroxide or potassium hydroxide solution is 15-45% (such as 15%, 20%, 25%, 30%, 35%, 40%, 45%), the molar ratio of 2,6-dihydroxynaphthalene and dimethyl sulfate is 1: 2.8, and the 2 , The average yield of 6-dimethoxynaphthalene was 70.1%.

Embodiment 2

[0018] The molar ratio of 2,6-dihydroxynaphthalene and dimethyl sulfate is 1: 3.0, all the other are the same as in Example 1, and the average yield of 2,6-dimethoxynaphthalene generated by the reaction is 85.4%.

Embodiment 3

[0020] The molar ratio of 2,6-dihydroxynaphthalene and dimethyl sulfate is 1: 3.5, all the other are the same as in Example 1, and the average yield of 2,6-dimethoxynaphthalene generated by the reaction is 86.2%.

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Abstract

The invention discloses a process for producing 2,6-dimethoxynaphthalene, which comprises dissolving 2,6-dihydroxy naphthalene into alcohol dissolvent, reacting with dimethyl sulfate for 3-6 hours under alkaline condition at 20-70 deg. C, thus obtaining 2,6-dimethoxynaphthalene, the alkaline solution used in the reaction is selected from sodium hydroxide and potassium hydroxide, the concentration is between 15-45%, the mol ratio of 2,6-dimethoxynaphthalene and dimethyl sulfate is between 1:2.8-4.5, the purity of the 2,6-dimethoxynaphthalene is greater then 98%. The production process has the advantages of short reaction time and high yield.

Description

Technical field: [0001] The invention relates to a method for producing aromatic compounds. Background technique: [0002] Retrieval of relevant information: [0003] 1. So far, no other unit in China has researched or produced 2,6-dimethoxynaphthalene. [0004] 2. In foreign countries, 2,6-dihydroxynaphthalene is generally synthesized by directly reacting with dimethyl sulfate in lye, and the reaction time is long and the yield is low. Invention content: [0005] The object of the present invention is to provide a kind of reaction time is short, the production method of the 2,6-dimethoxynaphthalene that product yield is high. [0006] The objective technical solution of the present invention is: [0007] A kind of 2, the production method of 6-dimethoxynaphthalene, its difference with prior art is that 2,6-dihydroxynaphthalene is dissolved in the alcoholic solvent, under alkaline condition and dimethyl sulfate React at 20-70°C for 3-6 hours to generate 2,6-dimethoxyna...

Claims

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Application Information

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IPC IPC(8): C07C43/235C07C41/16
Inventor 宋勇袁仲飞
Owner 南通莱嘉利化工有限公司
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