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Purification system and purification method of 2-methylnaphthalene

A purification method and technology of methylnaphthalene, applied in the field of purification system of 2-methylnaphthalene, can solve the problems of complex operation, low product purity and yield, and achieve the effect of simple operation, favorable recycling and high purity

Pending Publication Date: 2022-06-28
CCTEG CHINA COAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a purification system and purification method of 2-methylnaphthalene, at least to a certain extent, to solve the problems of complex operation, low product purity and low yield in the existing 2-methylnaphthalene purification process

Method used

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  • Purification system and purification method of 2-methylnaphthalene

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Comparison scheme
Effect test

Embodiment 1

[0081] The present embodiment proposes a method for purifying 2-methylnaphthalene, comprising the following steps:

[0082] (1) Addition of materials

[0083] Ethanolamine solvent and demineralized water are mixed into solution by mass ratio 6:1, join in crystallizing tank, then add 2-methylnaphthalene crude product (wherein the content of 2-methylnaphthalene is 85.2%), 2-methylnaphthalene The mass ratio of the crude product to the ethanolamine solvent was 1:1.5, and nitrogen was introduced into the crystallizing tank to keep the pressure in the crystallizing tank at 0.5 bar.

[0084] (2) Heating up and melting

[0085] Stir and heat the materials in the crystallizing tank at a stirring speed of 160 r / min and a heating rate of 3 °C / h, and heat to 45 °C for 20 minutes. At this time, all the materials melt into liquid.

[0086] (3) Frozen crystallization

[0087] After all the materials in the crystallizing tank are melted, cool down at a rate of 1 °C / h, and after cooling to -7...

Embodiment 2

[0097] The present embodiment proposes a method for purifying 2-methylnaphthalene, comprising the following steps:

[0098] (1) Addition of materials

[0099] Glycerol solvent and demineralized water are mixed into solution by mass ratio 5:1, join in crystallizing tank, then add 2-methylnaphthalene crude product (wherein the content of 2-methylnaphthalene is 86.5%), 2-methylnaphthalene The mass ratio of the crude naphthalene to the glycerol solvent was 1:3, and nitrogen was introduced into the crystallizing tank to keep the pressure in the crystallizing tank at 1.0 bar.

[0100] (2) Heating up and melting

[0101] Stir and heat the materials in the crystallizing tank at a stirring speed of 200 r / min and a heating rate of 4 °C / h, and heat to 50 °C for 30 minutes, at which time all the materials melt into liquid.

[0102] (3) Frozen crystallization

[0103] After all the materials in the crystallizing tank are melted, cool down at a rate of 2 °C / h. After cooling to -10 °C, ke...

Embodiment 3

[0113] The present embodiment proposes a method for purifying 2-methylnaphthalene, comprising the following steps:

[0114] (1) Addition of materials

[0115] The n-heptane solvent and demineralized water are mixed into solution by mass ratio 3:1, join in the crystallizing tank, then add 2-methylnaphthalene crude product (wherein the content of 2-methylnaphthalene is 87.3%), 2-methylnaphthalene The mass ratio of crude naphthalene to n-heptane solvent was 1:8, and nitrogen was introduced into the crystallizing tank to keep the pressure in the crystallizing tank at 2.0 bar.

[0116] (2) Heating up and melting

[0117] Stir and heat the material in the crystallizing tank at a stirring speed of 300r / min and a heating rate of 5°C / h, heat it to 60°C, and keep it for 30min, at which time all the material melts into a liquid.

[0118] (3) Frozen crystallization

[0119] After all the materials in the crystallizing tank are melted, cool down at a rate of 2 °C / h, and after cooling to...

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Abstract

The invention relates to a 2-methylnaphthalene purification system and method, and the method comprises the following steps: adding a 2-methylnaphthalene crude product, softened water and a solvent into a crystallizing tank, and sequentially carrying out heating melting and freezing crystallization; introducing a mixture of a crystal substance and an amorphous liquid obtained after freezing crystallization into a filtering tank, carrying out step-by-step filtering treatment on the amorphous liquid by utilizing a three-stage filter element in the filtering tank, and introducing into a rectifying tower; the crystal substance enters a product tank after being heated and melted, and purified 2-methylnaphthalene is obtained; and in the rectifying tower, batch rectification is carried out on the amorphous liquid which is filtered step by step, the obtained softened water and the solvent are added into the crystallizing tank again for cyclic utilization, and residual liquid which is not evaporated out is thrown outwards. By adopting the purification method disclosed by the invention, the obtained 2-methylnaphthalene product is uniform in size, high in yield and high in purity; in addition, the method is easy to operate, strong acid and strong alkali are not involved, and the technological process is free of pollution and environmentally friendly.

Description

technical field [0001] The invention belongs to the technical field of purification and purification of fine chemicals, in particular, the invention relates to a purification system and purification method of 2-methylnaphthalene. Background technique [0002] 2-Methylnaphthalene, also known as β-methylnaphthalene, is an important fine chemical and organic chemical raw material with a wide range of uses, mainly used in medicine, dyes, photosensitive materials, rubber, plastics, agricultural feed and new polymer materials In industries such as 2-methylnaphthalene, for example, 2-methylnaphthalene is used in the production of vitamin K3, hemostatic agents, textile detergents, emulsifiers, and wetting agents, and 2-methylnaphthalene is also used in the production of cement water reducing agents, plant growth regulators, and feedstuffs. The main raw material of fine chemical products such as additives. [0003] The purity of 2-methylnaphthalene is an important factor affecting i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D9/02B01D36/00B01D29/56B01D29/84B01D35/18B01J6/00C07C7/00C07C7/14C07C15/24
CPCB01D9/00B01D9/0059B01D9/004B01D36/00B01D36/003B01D36/008B01J6/005B01J6/00B01D29/56B01D29/84B01D35/18C07C7/005C07C7/14B01D2009/0086C07C15/24Y02P20/10
Inventor 胡发亭毛学锋李军芳李恒张笑然钟金龙
Owner CCTEG CHINA COAL RES INST
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