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Synthesis method of 2-alkyl anthraquinone

A synthesis method and technology of alkyl anthraquinone are applied in the field of preparation of 2-alkyl anthraquinone, which can solve the problems of difficulty, low selectivity, and alkyl group shedding, and achieve the effect of simple process and environmental friendliness.

Active Publication Date: 2005-08-10
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The output of 2-alkylanthraquinone can no longer meet the growing demand
But the disadvantage is that the conversion rate of 2-(benzoyl)benzoic acid is low, and the selectivity of anthraquinone is not high
However, in the process of synthesizing 2-alkylanthraquinones, it is relatively more difficult to obtain high-purity 2-alkylanthraquinones due to problems such as detachment of alkyl groups during the reaction process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The original powder of beta zeolite molecular sieve is exchanged for acidic beta zeolite molecular sieve. Weigh 40g of beta zeolite molecular sieve raw powder into a three-necked flask, then add 200ml of 0.4mol / L ammonium nitrate, and exchange at 80°C for two hours. After the exchange, it is dried, and then placed in a muffle furnace for calcination at 550° C. for 4 hours to obtain an acidic beta zeolite molecular sieve.

Embodiment 2

[0034] At 230° C., 3.5 g of 2-(4′-ethylbenzoyl) benzoic acid was added to the reaction vessel, and after it was liquefied, 1.0 g of acid beta zeolite molecular sieve was added thereto. After the addition, the reaction was carried out for 1.5 hours, and after cooling slightly, 1,4-dioxane solvent was added thereto. The catalyst was separated by centrifugation, and the resulting reaction solution was analyzed by liquid chromatography. The conversion rate of 2-(4'-ethylbenzoyl)benzoic acid was 41%, and the selectivity of 2-ethylanthraquinone was 89%.

Embodiment 3

[0036] The reaction time was changed to 1.0 hour, and other conditions were the same as in Example 2. The conversion rate of 2-(4'-ethylbenzoyl)benzoic acid was 28.7%, and the selectivity of 2-ethylanthraquinone was 89%.

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PUM

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Abstract

A process for preparing 2-alkylanthraquinone from 2-(4'-alkylbenzoyl) benzoic acid includes such steps as mixing said raw material with solid acid catalyst and closed-loop dewatering reacting. Its advantages are high purity, high transform rate and high selectivity.

Description

technical field [0001] The invention belongs to the technical field of synthetic chemical engineering. In particular, it relates to a preparation method of 2-alkylanthraquinone. Background technique [0002] 2-Alkyl anthraquinone is mainly used as a carrier for the preparation of hydrogen peroxide by anthraquinone method, and can also be used as an intermediate for degrading resins, photosensitive polymer materials or dyes. With the rapid development of global hydrogen peroxide and synthetic resin industries. The production of 2-alkylanthraquinones can no longer meet the growing demand. [0003] The traditional production process of 2-alkylanthraquinone is complicated, and concentrated sulfuric acid is used for dehydration and ring closure. During the production process, a large amount of waste acid is produced, which has caused serious harm to equipment and the environment. Therefore, a new production method is urgently needed to make up for it. insufficient. [0004] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C46/00C07C50/18
Inventor 郭新闻徐仁顺王桂茹刘靖
Owner DALIAN UNIV OF TECH
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