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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 simultaneously extracting high-purity β-methylnaphthalene and indole, and extracting high-purity β-methylnaphthalene and indole, which can solve problems such as corrosion, polluted equipment, and single products , to achieve the effect of convenient and simple operation, complete separation and excellent product quality

Active Publication Date: 2013-05-08
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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 300 tons of β-methyl naphthalene content of 35.24%, indole content of 4.12% of coal tar distillation wash oil fraction as raw material (DMNO-1) through pre-distillation (vacuum distillation column is a 60-layer plate Sieve tray tower, the pressure at the top of the tower is controlled at -66kPa, the cut-off temperature is 205-215°C, the reflux ratio is controlled at 8, and the recovery rate of the distillate rich in β-methylnaphthalene extracted from the upper side line is controlled at 36%) to obtain β - 155 tons of β-methylnaphthalene-rich fraction (DMNO-2) with a methylnaphthalene content of 76.67wt% and an indole content of 3.01wt%; 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 effective production section is about 181°C, an...

Embodiment 2

[0043] The β-methylnaphthalene content is 38.07%, the indole content is 3.79% of the coal tar distillation wash oil fraction as raw material (DMNO-1) through pre-distillation (vacuum distillation column is a sieve plate with 100 layers tower, the pressure at the top of the tower is -20kPa, the cut-off temperature is 215-225°C, the reflux ratio is 12, and the recovery rate of the fraction rich in β-methylnaphthalene from the upper side stream is 50%) to obtain β-methylnaphthalene β-methylnaphthalene-rich fraction (DMNO-2) with a content of 77.8% and an indole content of 2.39%, the yield of β-methylnaphthalene was 70.5%; the fraction 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 is about 195°C, and ...

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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 to 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 ap...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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