Method for synthesizing anthraquinone

A synthesis method and anthraquinone technology are applied in the field of organic compound preparation, can solve problems such as unreported synthetic application of anthraquinone, and achieve the effects of low cost, simplified post-processing steps, and reduced cost

Inactive Publication Date: 2011-11-16
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] There have been some reports on the application of ionic liquids as solvents and catalysts in organic synthesis, but the application in anthraquinone synthesis has not been reported yet

Method used

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  • Method for synthesizing anthraquinone

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Effect test

Embodiment 1

[0015] Add 5g (35mmol) of dimethylamine sulfate and 1.13g (5mmol) of o-benzoylbenzoic acid into a flask, install a condenser tube, and connect it to the decompression system. Then, under the pressure of 5mmHg, it was heated to 120° C., and after 5 hours of reaction, the heating was stopped and the pressure was returned to atmospheric pressure. 0.84 g of product anthraquinone was collected from the condenser tube, and the yield was 80.8%.

Embodiment 2

[0017] Add 5g (about 29mmol) of diethylamine sulfate and 1.13g (5mmol) of o-benzoylbenzoic acid into a flask, install a condenser tube, and connect it to the decompression system. Then, under the pressure of 10 mmHg, heat to 130° C., and after 5 hours of reaction, stop heating and return the pressure to atmospheric pressure. 0.80 g of product anthraquinone was collected from the condenser tube, and the yield was 76.9%.

Embodiment 3

[0019] Add 5g (25mmol) of triethylamine sulfate and 1.13g (5mmol) of o-benzoylbenzoic acid into a flask, install a condenser tube, and connect it to the decompression system. Then, under the pressure of 25 mmHg, heat to 150° C., after 3 hours of reaction, stop heating and return the pressure to atmospheric pressure. 0.75 g of product anthraquinone was collected from the condenser, and the yield was 72.1%.

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Abstract

The invention discloses a method for synthesizing anthraquinone, which belongs to the technical field of preparation of organic compounds. In the method, by using acidic ionic liquid a solvent and a catalyst and by heating under a pressure lower than the atmosphere, o-benzoylbenzoic acid is subjected to cyclodehydration, an anthraquinone product is obtained by sublimation and collection, the further purification of the product is not needed, and the ionic liquid can be repeatedly used for many times. In the invention, the used amount of the ionic liquid is 4 to 8 times the mass of o-benzoylbenzoic acid, the reaction temperature is 120 to 180 DEG C, the reaction time is 3 to 10 hours, and the pressure is 5 to 50mmHg. Due to the characteristics of the ionic liquid, three industrial wastes, namely waste gas, waste water and waste residue, are not produced in a reaction process, so the reaction process is a green chemical process; and thus, the pollution to the environment is reduced to the maximum degree. The method has the advantages of simple process, high yield, environment friendliness and low cost, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method for synthesizing anthraquinone, which belongs to the technical field of organic compound preparation. Background technique [0002] The invention relates to a synthesis method of anthraquinone. [0003] Anthraquinone is a widely used chemical raw material, which can be used in industrial fields such as dyes, medicines, and pesticides. Anthraquinone dyes are a large category of organic dyes, and their number of varieties is second only to azo dyes. Anthraquinone and its derivatives are important organic intermediates of medicine and pesticide. Anthraquinones are also used as catalysts for delignification of pulp and cotton fibers in the paper and textile industries. Therefore, the world's annual output of anthraquinone is tens of thousands of tons. [0004] There are two main industrial production methods of anthraquinone, one is to prepare anthraquinone by oxidation of anthracene. Reports in this regard include pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C50/18C07C46/00
CPCY02P20/54
Inventor 陈平兰鲲吴艳华李超张威
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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