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Purifying and refining method of 1,5-dihydroxynaphthalene

A technology of dihydroxynaphthalene and a purification method, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve problems such as no literature reports on the purification and purification method of 1.5-dihydroxynaphthalene, and reduce tar formation. fouling, simple process, reducing the effect of high temperature coking

Inactive Publication Date: 2013-06-12
DONDONG SUNLINE CHEM
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Problems solved by technology

[0020] There is no literature report on the purification and refining method of industrial product 1.5-dihydroxynaphthalene

Method used

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  • Purifying and refining method of 1,5-dihydroxynaphthalene
  • Purifying and refining method of 1,5-dihydroxynaphthalene
  • Purifying and refining method of 1,5-dihydroxynaphthalene

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Embodiment Construction

[0033] 1) Equipment used, heating oil equipment, horizontal tubular heat exchange sublimator, first collector, second collector, vacuum pump equipment, heating oil equipment and horizontal tubular heat exchange sublimator through hot oil inlet and outlet pipes connection, implement hot oil circulation heating work on the tubular heat exchange sublimator, the horizontal tubular heat exchange sublimator consists of a cylinder 1, a front partition 2 welded in the cylinder 1, a rear partition 3, distributed inserts A number of heat exchange tubes 4 welded on the front and rear partitions 2 and 3, a sealed heating oil chamber is formed between the front partition 2 and the rear partition 3 and the cylinder body 1, the front end or rear end of the cylinder body 1, or the cylinder body The front and rear ends of 1 are provided with hingedly connected openable sealing end caps 12, 13, and a distillation outlet pipe 15 and a control valve are provided on the sealing end caps 12 / 13 to co...

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Abstract

The invention relates to a purifying and refining method of 1,5-dihydroxynaphthalene. The method comprises the following steps of: respectively collecting impurities and refined products by using a horizontal tubular heat exchange sublimator and two collectors under a vacuumizing condition; reducing the melting point of a compound in a reduced pressure state by extraction by a sublimation method; melting the compound to liquid and then heating and sublimating to gas; cooling and recrystallizing to solid; and recrystallizing and separating compounds in industrial 1,5-dihydroxynaphthalene with different melting points at different temperatures. The content of the purified and refined 1,5-dihydroxynaphthalene is over 99.5%.

Description

technical field [0001] The present invention relates to purifying industrial product 1.5-dihydroxynaphthalene through a sublimation method to produce 1.5-dihydroxynaphthalene with higher purity. Background technique [0002] 1.5-Dihydroxynaphthalene molecular formula: C 10 h 8 o 2 , molecular weight: 160.17, melting point: 258°C, CAS number: 83-56-7 [0003] Structural formula: [0004] Appearance: white crystalline powder mixed solid. [0005] 1.5-Dihydroxynaphthalene industrial products usually contain about 96%, which is an important intermediate of dyes and other organic compounds. [0006] The refined product of 1.5-dihydroxynaphthalene means that the content is more than 99.5%. Its application field is greatly improved compared with industrial products, and it can be used in medicine, flame retardants for new polymer materials, adhesives, hair dyes, industrial electronic components, and liquid crystals. Products, TVs, computers, mobile phones and other fields. ...

Claims

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Application Information

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IPC IPC(8): C07C39/14C07C37/70
Inventor 薛巍
Owner DONDONG SUNLINE CHEM
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