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Method for preparing 2-ethyl anthraquinone through one-step reaction of ethylbenzene and phthalic anhydride under catalysis of alkali desilication modified Hbeta molecular sieve

A molecular sieve catalyzed ethylbenzene and alkali desiliconization modification technology, applied in chemical instruments and methods, organic compound preparation, quinone preparation, etc. The problem is to achieve the effect of realizing large-scale industrial production, the reaction process is simple and easy to operate, and the conversion rate of phthalic anhydride is high.

Active Publication Date: 2015-07-29
宜兴利荣达科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the complex production process and the production process caused by using anhydrous aluminum trichloride and concentrated sulfuric acid two homogeneous catalysts in the process of preparing 2-ethylanthraquinone by two-step reaction using ethylbenzene and phthalic anhydride respectively. A large amount of acid waste water, serious corrosion to equipment, catalysts that cannot be recycled, and continuous production process cannot be realized. Therefore, a Hβ molecular sieve modified by alkali desiliconization is provided to catalyze the reaction of ethylbenzene and phthalic anhydride to prepare 2-ethyl Anthraquinone method

Method used

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  • Method for preparing 2-ethyl anthraquinone through one-step reaction of ethylbenzene and phthalic anhydride under catalysis of alkali desilication modified Hbeta molecular sieve
  • Method for preparing 2-ethyl anthraquinone through one-step reaction of ethylbenzene and phthalic anhydride under catalysis of alkali desilication modified Hbeta molecular sieve
  • Method for preparing 2-ethyl anthraquinone through one-step reaction of ethylbenzene and phthalic anhydride under catalysis of alkali desilication modified Hbeta molecular sieve

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specific Embodiment approach 1

[0017] Specific embodiment one: In this embodiment, a method for preparing 2-ethylanthraquinone by one-step reaction of ethylbenzene and phthalic anhydride catalyzed by Hβ molecular sieve modified by alkali desiliconization is carried out according to the following steps:

[0018] Add phthalic anhydride and ethylbenzene into the tank reactor, stir and mix evenly to obtain the reactant, then add the Hβ molecular sieve modified by catalyst alkali desiliconization into the tank reactor, and then react at a reaction temperature of 170°C to 230°C and React for 1.2h to 5h at a rotating speed of 400r / min to 800r / min to obtain a solid-liquid mixture. After cooling, separate the Hβ molecular sieve modified by alkali desiliconization of the solid catalyst to obtain 2-ethylanthraquinone;

[0019] The mass ratio of the phthalic anhydride to ethylbenzene is 1:(3-5); the mass ratio of the reactant to the Hβ molecular sieve modified by alkali desiliconization of the catalyst is 100:(8-20).

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specific Embodiment approach 2

[0021] Embodiment 2: This embodiment is different from Embodiment 1 in that the mass ratio of phthalic anhydride to ethylbenzene is 1:3.5. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0022] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the alkali desilication modified Hβ molecular sieve is desiliconized by alkali under the condition of air atmosphere with an activation temperature of 400°C to 600°C. It is obtained by activating Hβ molecular sieve, and the activation time is 1h to 5h. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a method for preparing 2-ethyl anthraquinone with a one-step method, in particular to a method for preparing the 2-ethyl anthraquinone through a one-step reaction of ethylbenzene and phthalic anhydride under catalysis of an alkali desilication modified Hbeta molecular sieve, and aims to solve technical problems that the production technology is complex, a large amount of acid wastewater is produced, equipment is corroded severely, catalysts cannot be recycled and continuity of the production process cannot be realized due to the fact that two homogeneous catalysts, namely, anhydrous aluminum trichloride and concentrated sulfuric acid, are used respectively when the 2-ethyl anthraquinone is prepared through a two-step reaction of the ethylbenzene and the phthalic anhydride at present. The method comprises steps as follows: the phthalic anhydride and the ethylbenzene are evenly mixed, then the catalyst, namely, the alkali desilication modified Hbeta molecular sieve, is added, the mixture reacts at the reaction temperature of 170-230 DEG C for 1.2-5 h, a solid-liquid mixture is obtained, the solid catalyst, namely, the alkali desilication modified Hbeta molecular sieve, is separated after cooling, and the 2-ethyl anthraquinone is obtained. The method is mild in reaction condition, high in product yield and high in phthalic anhydride conversion rate.

Description

technical field [0001] The invention relates to a one-step method for preparing 2-ethylanthraquinone. Background technique [0002] 2-Ethylanthraquinone is an important fine chemical product and intermediate product, and has been widely used in the synthesis of medicine, pesticide, dye, paint, photodegradable resin and photopolymerization initiator, especially with the development of medicine, military With the increasing demand for hydrogen peroxide in fields such as chemical industry and chemical industry, the demand for 2-ethylanthraquinone, which is used as a hydrogen-carrying medium in the hydrogen peroxide preparation process, also increases synchronously at a rate of 8% to 10% per year. [0003] At present, the anthracene oxidation method and the phthalic anhydride method are mainly used in the industry to prepare 2-ethylanthraquinone, and the phthalic anhydride method is the main process for producing 2-ethylanthraquinone in my country because the raw materials are c...

Claims

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Application Information

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IPC IPC(8): C07C50/16C07C46/00
CPCC07C46/00C07C50/16
Inventor 肖林飞孙艳丽吴伟
Owner 宜兴利荣达科技有限公司
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