Preparation method of 2-alkyl anthraquinone

A technology of alkyl anthraquinone and alkyl anthracene is applied in the field of preparation of 2-alkyl anthraquinone, and achieves the effects of less pollution, reduced operation difficulty, and reasonable and feasible technical route

Active Publication Date: 2020-10-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In summary, there is no report on a complete set of technology for the preparation of 2-alkylanthraquinones from anthracene

Method used

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  • Preparation method of 2-alkyl anthraquinone
  • Preparation method of 2-alkyl anthraquinone
  • Preparation method of 2-alkyl anthraquinone

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preparation example Construction

[0021] According to the present invention, the preparation method of described 2-alkylanthraquinone comprises the following steps:

[0022] (1) preparing a reaction product containing an alkyl anthracene from anthracene;

[0023] (2) separating the reaction product containing alkylanthracene obtained in step (1), the separation method comprising: separating anthracene by melting crystallization and separating 2-alkylanthracene by distillation;

[0024] (3) Preparation of 2-alkylanthraquinones from 2-alkylanthracenes obtained in step (2).

[0025] According to the present invention, the raw material anthracene can be reacted to produce alkyl anthracene. The method for preparing the reaction product containing alkylanthracene from anthracene can be any single reaction or multi-step combined reaction to introduce an alkyl group into anthracycline to prepare alkylanthracene. The anthracycline structure-containing substances in the reaction product obtained through step (1) inclu...

specific Embodiment approach

[0053] According to a specific embodiment of the present invention, in step (2-3), the method for described multi-step distillation comprises:

[0054] Method 1: if figure 2 As shown, the feed liquid of a series of alkylanthracene products containing 2-alkylanthracene is subjected to the first distillation, and the distillate containing the light component Cj1-anthracene and the bottom product containing the heavy component Cj2-anthracene are separated; The distillate containing the light component C1j-anthracene is subjected to a second distillation to obtain a distillate containing the light component Cj3-anthracene, and a bottom product containing the target product Ci-anthracene;

[0055] Among them, the light component Cj1-anthracene is an alkyl anthracene product whose total carbon number j1 of the alkyl side chain is an integer of 1

Embodiment 1

[0100] (1) Alkylation reaction.

[0101] Alkylation of anthracene and isopentene to prepare 2-pentylanthracene, mesitylene as solvent and methanesulfonic acid as catalyst. At room temperature, 460 g of anthracene, 800 ml of mesitylene, and 42 g of methanesulfonic acid were added to a 2L stirred tank. After sealing, the temperature is raised to 165° C. at a rotational speed of 1000 rpm, and the pressure is 0.3 MPa. 151 g of isoamylene was added to the kettle through a plunger pump, and the feed rate was 6.6 g / min. After the feeding of isopentene was completed, the reaction was continued for 270 min while maintaining the reaction conditions, and then the reaction was terminated. 10 batches were reacted under the same conditions. After the catalyst was separated, the alkylation reaction product was collected uniformly as the raw material for the separation of alkylanthracene.

[0102] (2) Separation.

[0103] The alkylation reaction product is sent to the atmospheric distilla...

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Abstract

The invention relates to the field of preparation of 2-alkyl anthraquinone, and particularly discloses a preparation method of the 2-alkyl anthraquinone. The method comprises the following steps: (1)preparing a reaction product containing alkyl anthracene from anthracene; (2) separating the reaction product containing THE alkyl anthracene obtained in the step (1), wherein the separation method comprises carrying out melt crystallization to separate the anthracene and carrying out distillation to separate the 2-alkyl anthracene; and (3) preparing the 2-alkyl anthraquinone from the 2-alkyl anthracene obtained in the step (2). The method provided by the invention opens up a new direction for green preparation of the 2-alkyl anthraquinone, the method can significantly reduce the separation operation difficulty of a high-boiling-point high-melting-point mixture system, the separation efficiency is high, the product purity is 99.5%, and the yield is 94.23%.

Description

technical field [0001] The invention relates to a method for preparing organic matter, in particular to a method for preparing 2-alkylanthraquinone. Background technique [0002] Hydrogen peroxide is an important green basic chemical with a high degree of industrial relevance. Since 2008, my country has become the largest country in the production of hydrogen peroxide, and its consumption in 2015 has exceeded 10 million t / a ( at 27.5%). At present, the process technology for producing hydrogen peroxide at home and abroad is mainly the anthraquinone method. The 2-alkylanthraquinone in this process is used as the "carrier" of the process, which directly affects the quality and output of hydrogen peroxide. The phthalic anhydride method is the main method to produce 2-alkylanthraquinones, but there are serious pollution problems in this process. To produce 1 ton of 2-ethylanthraquinone, it needs to invest 1.76 tons of anhydrous AlCl 3 and 4.2 tons of fuming H 2 SO 4 (20%), ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C2/70C07C7/00C07C7/04C07C7/14C07C15/28C07C46/04C07C50/18
CPCC07C2/70C07C7/005C07C7/04C07C7/14C07C46/04C07C15/28C07C50/18
Inventor 郑博宗保宁费建奇潘智勇郄思远张月琴朱振兴毛俊义
Owner CHINA PETROLEUM & CHEM CORP
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