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Method for simultaneously extracting high-purity beta-methylnaphthalene and indole from coal tar

A technology of methylnaphthalene and coal tar, which is applied in the field of extracting high-purity β-methylnaphthalene and indole, and simultaneously extracting high-purity β-methylnaphthalene and indole, which can solve the problems of polluted equipment, corrosion, and single product , to achieve the effect of complete separation, convenient and simple operation, and excellent product quality

Active Publication Date: 2010-07-14
BAOWU CHARCOAL MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] The first aspect object of the present invention is to propose a kind of method that extracts high-purity β-methylnaphthalene and indole simultaneously from coal tar, this method does not adopt pickling, and can reclaim β-methylnaphthalene and indole simultaneously, To solve the problems of single product, serious pollution and equipment corrosion in the existing β-methylnaphthalene refining process

Method used

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  • Method for simultaneously extracting high-purity beta-methylnaphthalene and indole from coal tar
  • Method for simultaneously extracting high-purity beta-methylnaphthalene and indole from coal tar

Examples

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Effect test

Embodiment 1

[0041] 300 tons of β-methylnaphthalene content is 35.24%, and indole content is 4.12% the wash oil fraction of the coal tar distillation as raw material (DMNO-1) through pre-distillation (vacuum distillation tower is that plate number is 60 layers) Sieve tray tower, tower top pressure control is -66kPa, cutting temperature is 205 ~ 215 ℃, reflux ratio control is 8, and the fraction recovery rate that is rich in β-methyl naphthalene is controlled to be 36% in the upper layer side line extraction), obtains β - 155 tons of β-methylnaphthalene-rich fraction (DMNO-2) with 76.67wt% methylnaphthalene content and 3.01wt% indole content; 155 tons of β-methylnaphthalene-rich fraction (DMNO-2) Distillation in a high-efficiency stainless steel-packed batch distillation tower (the packing height of a high-efficiency stainless steel-packed batch distillation tower is equivalent to 110 layers of trays, the pressure at the top of the tower is controlled at -80Pa, the temperature in the effecti...

Embodiment 2

[0043] Be 38.07% with β-methyl naphthalene content, the wash oil cut that the coal tar distillation of indole content is 3.79% is as raw material (DMNO-1) through pre-distillation (vacuum distillation column is the sieve plate number of 100 layers) tower, the tower top pressure is-20kPa, the cutting temperature is 215~225 ℃, the reflux ratio is 12, and the recovery rate of the fraction rich in β-methylnaphthalene is 50% taken from the upper layer side line), to obtain β-methylnaphthalene Content is 77.8%, and indole content is the cut (DMNO-2) that is rich in β-methylnaphthalene of 2.39%, and the yield of β-methylnaphthalene is 70.5%; The cut that is rich in β-methylnaphthalene ( DMNO-2) in the high-efficiency stainless steel packed batch distillation tower (the packing height of the high-efficiency stainless steel packed batch rectification tower is equivalent to 100 layers of trays, the top pressure of the tower is -20kPa, the temperature of the effective production section i...

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Abstract

The invention relates to a method for extracting high-purity beta-methylnaphthalene and indole, in particular to a method for simultaneously extracting high-purity beta-methylnaphthalene and indole from coal tar, which belongs to the field of coal fine chemistry industry. The method is realized by the following steps of: rectifying washing oil distillate distilled from coal tar in a vacuum distillation tower under vacuum, and acquiring a distillate product rich in beta-methylnaphthalene from the side of the tower; introducing the distillate product of beta-methylnaphthalene into a highly-effective intermittent rectification tower, cutting front distillates, and remixing the front distillates, the crude product of beta-methylnaphthalene, back distillates and tower bottom liquid; and then, conducting semicontinuous azeotropic distillation to the crude product of beta-methylnaphthalene, acquiring a mixture of beta-methylnaphthalene and entrainer, and settling, laying and separating the mixture to obtain beta-methylnaphthalene; after each cycle of processing technologies, continuing to distill to obtain indole. The invention solves the problems of single product, serious pollution, serious equipment corrosion and the like existing in the traditional process for refining beta-methylnaphthalene.

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 and indole, in particular to a method for simultaneously extracting high-purity beta-methylnaphthalene and indole from coal tar. Background technique [0002] β-methylnaphthalene is an important organic chemical raw material, which can be widely used in the production of textile auxiliaries, lubricants and plant growth regulators. High-purity β-methylnaphthalene is a raw material for the synthesis of vitamin K drugs and feed additives . Natural β-methylnaphthalene is mainly stored in coal tar, with a content of about 1-1.5%, and mainly concentrated in washing oil fractions (about 8.8%) and naphthalene oil fractions (about 5.5%). [0003] Since the difference between the boiling points of β-methylnaphthalene and α-methylnaphthalene is only 3°C, and azeotrope occurs with indole at the same time, the industrial appli...

Claims

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Application Information

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IPC IPC(8): C07C15/24C07C7/04C07C7/06C07D209/06C07D209/08
Inventor 汪旭顾镇钧袁康入魏少华黄霖李志强陆晔
Owner BAOWU CHARCOAL MATERIAL TECH CO LTD
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