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Method and device for removing indole from beta-methylnaphthalene

A technology of methylnaphthalene and indole, which is applied in the field of removing indole from β-methylnaphthalene, can solve the problems of low product purity, not conforming to the concept, and not being available for export, and achieves simple equipment and process, improved energy consumption and low cost. Large, easy-to-operate effects

Active Publication Date: 2013-02-20
BAOWU CHARCOAL MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, waste acid and alkali are produced in the production process, which does not conform to the concept of environmental management in the 12th Five-Year Plan
[0007] In the patent "A method for refining β-methylnaphthalene from coal tar crude methylnaphthalene" (application number 200610134603.6), the azeotropic agent is selected as ethylene glycol, and the raw material is crude β-methylnaphthalene in coal tar. After the quinoline is eluted with acid, it is azeotroped with the entrainer, and the mixture of β-methylnaphthalene and entrainer is extracted, and the static layer is separated, and then the static layered liquid is rectified to obtain β-methylnaphthalene with a purity of about 95%. Methylnaphthalene, β-methylnaphthalene of this kind of purity, due to the low purity of the product, can only be used by domestic manufacturers and cannot be exported

Method used

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  • Method and device for removing indole from beta-methylnaphthalene

Examples

Experimental program
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Embodiment 1

[0034] equipment such as figure 1 As shown, its structure comprises distillation still 11 and azeotropic distillation tower 2; Still kettle and the steam pipeline 18 of bottom of azeotropic distillation tower and the reflux liquid pipeline 19 of bottom form loop;

[0035]A top cooler 5 is installed on the top of the azeotropic distillation tower, and the top extraction pipeline 3 is connected to the azeotropic distillation tower through the top extraction outlet, and the top extraction outlet is below the top cooler, and an overflow extraction baffle is provided 14; The tower top production line 3 is connected to the cooler 4, the separation tank A 6 and the separation tank B 7 in sequence; the lower part of the separation tank A 6 is connected to the upper part of the separation tank B 7, and the tail gas discharge line 1 is arranged in the azeotropic distillation tower 2 the top to ensure the negative pressure of the azeotropic distillation column;

[0036] A still still re...

Embodiment 2

[0049] The device is the same as in Example 1.

[0050] The difference of raw material component has difference with embodiment 1, and in the raw material, beta-methyl naphthalene content is 96.23%, and indole content is 0.78%. The β-methylnaphthalene raw material and the entrainer are added in a ratio of 1:1.2, and the temperature and pressure control parameters of the tower body are the same. All the other method conditions and processing steps are basically the same as the above examples, the only difference is. The purity of the obtained product is 98.0%, the content of ethylene glycol is 0.10%, and the content of indole is not detected.

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Abstract

Relating to the field of chemical industry, the invention discloses a method and a device for removing indole from beta-methylnaphthalene. Structurally, the device comprises a distillation kettle and azeotropic distillation tower. An overflow recovery baffle is disposed at a tower top recovery outlet of the azeotropic distillation tower. A tower top recovery pipeline is connected to a cooler, a separation tank A and a separation tank B in order. The method includes: adding a mixture of the raw material beta-methylnaphthalene and an azeotropic agent into the distillation kettle, controlling the temperature of the kettle bottom at 145-147DEG C; maintaining the azeotropic distillation tower at a pressure of -70-90kpa and the tower top at a temperature of 140-142DEG C; carrying out intermittent azeotropic distillation separation, subjecting the evaporated liquid to cooling by the tower top cooler and internal reflux; and subjecting the azeotropic distillation tower top recovered liquid to cooling by the cooler, then leaving the liquid to flow into the separation tank A and the separation tank B in order, performing standing layering, and recovering the product. By means of the method and the device, after distillation separation, the content of the raw material beta-methylnaphthalene can be increased to over 98%, and the indole content decreased to an undetectable degree. The device and the method provided in the invention are simple and are easy to operate.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a method and a device for removing indole from beta-methylnaphthalene. Background technique [0002] At present, in the fields of petroleum and chemical industry, the method of separating and purifying compounds by means of azeotropic distillation has been widely used. Azeotropic distillation is a method of azeotropic distillation using an entrainer that can form an azeotropic mixture with low boiling point substances and high boiling point substances. [0003] The main viewpoints on the technical development of azeotropic distillation can be roughly divided into separation ability, controllability, reflux ratio reduction, and post-treatment of recovered distillate. Generally speaking, the higher the reflux ratio, the better the operation stability, and when the reflux ratio is decreased, the operation stability is generally worse. Furthermore, when the reflux ratio is reduced ...

Claims

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Application Information

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IPC IPC(8): B01D3/00C07C15/24C07C7/06
Inventor 刘晟铭张金涛薛璋韩仕兵李志强陆晔
Owner BAOWU CHARCOAL MATERIAL TECH CO LTD
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