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Method for extracting highly pure beta-methylnaphthalene from coal tar wash oil

A technology of methylnaphthalene and coal tar, which is applied in the field of extracting high-purity β-methylnaphthalene, can solve the problems of polluting equipment, complex process, high energy consumption, etc., and achieve the effects of low equipment requirements, convenient and simple operation, and low energy consumption

Inactive Publication Date: 2014-08-20
HUANGHUA XINNUOLIXING FINE CHEM
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the first aspect of the present invention is to propose a method for extracting high-purity β-methylnaphthalene from coal tar wash oil, to solve the existing β-methylnaphthalene refinement process, complicated process, high energy consumption, and pollution and serious corrosion of equipment

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  • Method for extracting highly pure beta-methylnaphthalene from coal tar wash oil

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Embodiment 1

[0029] 120tβ-methyl naphthalene content is 27.5wt%, and the indole content is 3.92wt% the wash oil fraction of coal tar distillation as raw material, through continuous pre-distillation, first distilled in 1# pre-distillation tower (1# pre-distillation tower It is a high-efficiency stainless steel packed tower with a packing height equivalent to 60 layers of trays. The top pressure is 5KPa, the top temperature is 220°C, the cutting temperature is 235-255°C, the reflux ratio is 15, and the upper side stream is rich in β-methyl The fraction recovery rate of naphthalene is 39%), obtains β-methylnaphthalene content 69.76wt%, and indole content is the cut 46.8t that is rich in β-methylnaphthalene of 2.79 wt %; The cut is distilled in the 2# pre-distillation tower (2# pre-distillation tower is preferably a high-efficiency stainless steel packed tower with a packing height of more than 80 layers, the preferred pressure at the top of the tower is 5KPa, the effective extraction section ...

Embodiment 2

[0031] With 120tβ-methylnaphthalene content as 28.3wt%, indole content as 4.15wt% coal tar wash oil fraction distillation as raw material, through continuous pre-distillation, first distilled in 1# pre-distillation tower (1# pre-distillation tower It is a high-efficiency stainless steel packed tower with a packing height equivalent to 60 layers of trays. The top pressure is 8KPa, the top temperature is 215°C, the cutting temperature is 230-250°C, the reflux ratio is 20, and the upper side stream is rich in β-methyl The fraction recovery rate of naphthalene is 36%), obtain β-methylnaphthalene content 74.3wt%, indole content is the cut 43.06t that is rich in β-methylnaphthalene of 3.02 wt %; The fraction is distilled in the 2# pre-distillation tower (2# pre-distillation tower is preferably a high-efficiency stainless steel packed tower with a packing height of more than 80 layers, the tower top pressure is preferably 2KPa, the effective extraction section temperature is 242°C, an...

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Abstract

The invention belongs to the field of coal fine chemical industry, and relates to a method for extracting highly pure beta-methylnaphthalene from coal tar wash oil of. The method adopts a continuous pre-distillation and efficient batch distillation combining method. Continuous distillation adopts atmospheric distillation, and is carried out in two stages. Efficient batch distillation is characterized in that crude beta-methylnaphthalene obtained through the continuous pre-distillation undergoes batch vacuum rectification in a rectification tower. Compared with the prior art, the method has the advantages of simple and convenient operation, low equipment requirements, mild technological conditions, low energy consumption, low requirements of raw materials, low equipment corrosion, and reduction the pollution of the environment. The chemical purity of beta-methylnaphthalene obtained in the invention can reach above 97.5%.

Description

technical field [0001] The invention belongs to the field of coal fine chemical industry, and relates to a method for extracting high-purity beta-methylnaphthalene, in particular to a method for extracting high-purity beta-methylnaphthalene from coal tar wash oil. technical background [0002] β-Methylnaphthalene is an important product of deep processing of coal tar washing oil, and its content in washing oil is relatively large, accounting for about 8.8%. β-Methylnaphthalene is an important chemical raw material, which can be used to produce water reducing agent and diffusing agent. High-purity β-Methylnaphthalene can be used to synthesize vitamin K3 and biological feed additives. [0003] Since β-methylnaphthalene and indole (boiling point 254°C) are azeotropic during rectification, the industrial application of the method for extracting high-purity β-methylnaphthalene has been seldom, and only a few domestic manufacturers have realized the extraction of high-purity β-met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/04C07C15/24
Inventor 于锦军
Owner HUANGHUA XINNUOLIXING FINE CHEM
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