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Preparation method of carbon-10 heavy aromatics low-naphthalene high-boiling-point aromatics solvents

A technology for high-boiling aromatics and heavy aromatics, applied in separation methods, chemical instruments and methods, hydrocarbon distillation, etc., can solve problems such as high naphthalene content, achieve high boiling point, good environmental performance, and stable chemical and physical properties

Inactive Publication Date: 2018-03-09
JIANGSU HUALUN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to disclose a preparation method of a low-naphthalene and high-boiling-point aromatic hydrocarbon solvent of carbon ten heavy aromatics, which can solve the shortcomings of the high naphthalene content of the existing aromatic solvents

Method used

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  • Preparation method of carbon-10 heavy aromatics low-naphthalene high-boiling-point aromatics solvents
  • Preparation method of carbon-10 heavy aromatics low-naphthalene high-boiling-point aromatics solvents
  • Preparation method of carbon-10 heavy aromatics low-naphthalene high-boiling-point aromatics solvents

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preparation example Construction

[0015] see figure 1 , figure 2 and image 3 , the preparation method of described carbon ten heavy aromatic hydrocarbon low naphthalene high boiling point aromatic hydrocarbon solvent, comprises the steps:

[0016] (1) Separating the carbon-deca-heavy aromatics from the raw material by using a multi-stage rectification device 100 through a rectification method, and collecting products with a distillation range of 260-290°C;

[0017] (2) Pass the product obtained in step (1) through the crystallization device 200 and the liquid-solid separation device 300 in sequence, and the obtained mother liquor is the above-mentioned C10-heavy aromatic hydrocarbon solvent with low naphthalene and high boiling point, which is low naphthalene S-200 Solvent oil, the crystal is naphthalene;

[0018] The crystallization temperature is -5~-26°C;

[0019] Preferably, the raw material C10-heavy aromatics is introduced into four stages of vacuum rectification units connected in series, and then...

Embodiment 1

[0060] Feed raw carbon ten heavy aromatics into Figure 1~Figure 4 In the device shown, the product with a distillation range of 260~290°C is collected from the fourth-stage rectification tower, and then passes through the crystallization device 200 and the liquid-solid separation device 300 in sequence, and the obtained mother liquor is the above-mentioned carbon ten heavy aromatic hydrocarbon low naphthalene High-boiling aromatic hydrocarbon solvent, that is, low-naphthalene S-200 solvent oil, the crystal is naphthalene;

[0061] Among them, the structural parameters of the crystallization device:

[0062] The inner cavity of the crystallizer is divided into five cooling sections 23;

[0063] Pre-cool the product of step (1) to -5°C;

[0064] From top to bottom, the temperature of the last cooling section 23 is -25°C;

[0065] The residence time of the product of step (1) in the crystallizer is 15 minutes, and the linear velocity in the crystallization tube 21 is 1 m / s;

...

Embodiment 2

[0074] Feed raw carbon ten heavy aromatics into Figure 1~Figure 4 In the device shown, the product with a distillation range of 260~290°C is collected from the fourth-stage rectification tower, and then passes through the crystallization device 200 and the liquid-solid separation device 300 in sequence, and the obtained mother liquor is the above-mentioned carbon ten heavy aromatic hydrocarbon low naphthalene High-boiling aromatic hydrocarbon solvent, that is, low-naphthalene S-200 solvent oil, the crystal is naphthalene;

[0075] Among them, the structural parameters of the crystallization device:

[0076] The inner cavity of the crystallizer is divided into 8 cooling sections 23;

[0077] Pre-cool the product of step (1) to -10°C;

[0078] The temperature of the last cooling section 23 is -25°C;

[0079] The residence time of the product of step (1) in the crystallizer is 30 minutes, and the linear velocity in the crystallization tube 21 is 3 m / s;

[0080] The raw mater...

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Abstract

The invention discloses a preparation method of carbon-10 heavy aromatics low-naphthalene high-boiling-point aromatics solvents. The preparation method includes the steps: (1) separating carbon-10 heavy aromatics by the aid of multistage distillation devices and distillation methods, and collecting products with a distillation range of 260-290 DEG C; (2) treating the products acquired in the step(1) by the aid of a crystallization device and a liquid solid separation device to obtain the carbon-10 heavy aromatics low-naphthalene high-boiling-point aromatics solvents. Crystallization temperature ranges from -5 DEG C to -26 DEG C. The content of naphthalene in the aromatics solvents prepared by the method is lower than enterprise standards, the aromatics solvents are free from environmentalpollution, good in environmental-friendly performance and excellent in performance, high-dissolving ability can be played in the later evaporation phase, so that a coating is good in flatness and luster and free from orange peel, use safety of the aromatics solvents is improved, and the aromatics solvents can be used as advanced varnish baking solvents, pesticide emulsifiable concentrate solvents, polyurethane waterproof grouting material solvents, plasticizers and the like.

Description

technical field [0001] The invention relates to a preparation method of a low-naphthalene high-boiling-point aromatic hydrocarbon solvent. Background technique [0002] Naphthalene-free, low-naphthalene and high-boiling-point aromatic solvents are widely used in various low-naphthalene content coatings, silver pastes, pharmaceuticals and other industries. They can also be used in high-grade baking varnish solvents, insecticide emulsions and rubber resin solvents. As environmental protection requirements become more and more stringent , The naphthalene content in naphthalene-free, low-naphthalene and high-boiling aromatic hydrocarbon solvents is also required to be lower and lower. [0003] However, in the prior art, the production process of low-naphthalene and high-boiling-point aromatic hydrocarbon solvents is too complicated, and the obtained aromatic hydrocarbon solvent has a high naphthalene content. Even after a series of complicated processes, it is still impossible t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G7/00B01D3/14B01D9/02
CPCB01D3/146B01D9/02B01D2009/0086C10G7/00C10G2300/1096
Inventor 吴义彪许飞王长青吴建亮万春平徐明
Owner JIANGSU HUALUN CHEM
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