Method for refining high-purity anthracene and carbazole from crude anthracene

A high-purity, carbazole technology, used in distillation purification/separation, crystallization purification/separation, organic chemistry, etc., can solve problems such as clogging of distillation systems, improve product quality and yield, reduce energy consumption, and overcome clogging problems Effect

Inactive Publication Date: 2008-07-30
NANJING UNIV
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  • Abstract
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Problems solved by technology

[0010] The present invention is developed on the basis of a mature distillation method, and its main advantage is that it overcomes the blockage problem of the distillation system, is environmentally friendly and reduces consumption, and can truly realize large-scale, stable and continuous production of high-purity anthracene and carbazole

Method used

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  • Method for refining high-purity anthracene and carbazole from crude anthracene

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Embodiment 1

[0033] Embodiment 1: Separation and purification of refined anthracene and carbazole in crude anthracene

[0034]The crude anthracene raw material of a chemical enterprise contains a small amount of light components, 26% of anthracene, 22% of carbazole, and 35% of phenanthrene, and the rest are heavy components. The feed rate is 1200kg / h, the temperature is 20°C, and the pressure is 300kPa. Adopt the method of the present invention, add crude anthracene in the reactor 1 that crude benzene solvent is housed, the ratio of crude anthracene and solvent crude benzene is 1: 1.5 (mass ratio), the mixed solvent temperature is 60 ℃, slowly heats to 70 ℃, The material is discharged into the filter crystallization device 2, cooled to normal temperature, and centrifuged to obtain 650 kg / h of anthracene and carbazole solid phase mixture. Add the obtained solid-phase mixture of anthracene and carbazole into melting kettle 3 containing 200# solvent oil (hereinafter referred to as solvent 2),...

Embodiment 2

[0038] Embodiment 2: Separation and purification of refined anthracene and carbazole in crude anthracene

[0039] The crude anthracene raw material of a chemical enterprise contains a small amount of light components, 26% of anthracene, 22% of carbazole, and 35% of phenanthrene, and the rest are heavy components. The feed rate is 1200kg / h, the temperature is 20°C, and the pressure is 300kPa. Adopt the method of the present invention, add crude anthracene in the reactor 1 that crude benzene solvent is housed, the ratio of crude anthracene and solvent crude benzene is 1: 2.5 (mass ratio), the mixed solvent temperature is 60 ℃, slowly heats to 70 ℃, The material is discharged into the filter crystallization device 2, cooled to normal temperature, and centrifuged to obtain 650 kg / h of anthracene and carbazole solid phase mixture. Add the obtained solid-phase mixture of anthracene and carbazole into the melting tank 3 containing heavy benzene (hereinafter referred to as solvent 2),...

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Abstract

The invention relates to a method for refining anthracene and carbazole with a high purity from the crude anthracene. The method mainly consists of four steps: crude benzene with a doffing phenanthrene, separation of the anthracene from the carbazole by a rectification, a crystal preparation of the anthracene and the carbazole as well as solvent recycle. Solvent 1 is firstly used for removing the phenanthrene from the crude anthracene. The obtained anthracene and carbazole solid is mixed with solvent 2 and is rectified. The obtained anthracene and carbazole is cooled, crystallized and washed, and the anthracene with the purity of more than 96 percent is obtained. The method completely solves the problem of easy blocking in the rectification system. The invention has a higher product grade and a high yield and continuous stable operation. The using solvent amount is low (only 1 / 2 to 2 / 3 of the original solvent amount is required); besides, the invention has the advantages of low energy consumption (saving 30 to 50 percent totally) and flexible operation. The invention is particularly applicable to the anthracene and carbazole production with a large production scale, high requirement for the quality and environment protection and energy saving.

Description

technical field [0001] The invention belongs to the field of chemical separation, and specifically relates to a method for separating and refining anthracene, phenanthrene and carbazole. Background technique [0002] The main use of refined anthracene is to produce anthraquinone, which is an important raw material for the production of dyes. In addition, anthraquinone and its derivatives can also be used in cellulose industry, gas desulfurization, synthetic plastics, lubricating oil, lubricating oil additives, wetting agents, emulsifiers, pesticides and other fields. With the development of science and technology, the use of carbazole has been gradually developed, and the market is in the growth stage. It is mainly used in the fields of synthetic dyes (pigments), pesticides, medicines, photoelectric new materials, and synthetic resins. It can produce concrete with excellent performance. Water reducer, stabilizer for lubricating oil and heat transfer oil, special surfactant,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/04C07C7/14C07C15/28C07C15/30C07D209/84
Inventor 耿皎张志炳孟为民王明明吴有庭
Owner NANJING UNIV
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