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Separation and purification method for 2,6-diisopropylnaphthalene

A technology of diisopropylnaphthalene and a purification method, which is applied in the field of separation and purification of 2,6-diisopropylnaphthalene, can solve problems such as complex process, low product purity, and difficulty in industrial application, and achieve simple process and guaranteed product Purity, the effect of reducing the amount of solvent

Inactive Publication Date: 2017-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] What the present invention aims to solve is the technical problem of complex flow process, low product purity and difficult industrial application when separating and purifying 2,6-diisopropylnaphthalene in the prior art

Method used

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  • Separation and purification method for 2,6-diisopropylnaphthalene
  • Separation and purification method for 2,6-diisopropylnaphthalene
  • Separation and purification method for 2,6-diisopropylnaphthalene

Examples

Experimental program
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Effect test

Embodiment 1

[0026] use figure 1 In the flow process shown, the stream (101) is a mixed material liquid containing 2,6-diisopropylnaphthalene, and its composition in weight percentage is: 19.28% of naphthalene, 49.03% of monoisopropylnaphthalene, 2,6- Diisopropylnaphthalene 10.77%, 2,7-diisopropylnaphthalene 11.12%, other heavy components such as diisopropylnaphthalene and triisopropylnaphthalene 9.8%.

[0027] The number of theoretical plates of rectification column B1 is 30, the stream (101) enters from the 20th theoretical plate, the operating pressure is 10KPa, the reflux ratio is 0.5, the temperature at the top of the tower is 157.07°C, and the temperature at the bottom of the tower is 222.27°C. After separation, the stream (103) does not contain naphthalene, and the composition of 2,6-diisopropylnaphthalene is 34.74% by weight; the stream (103) enters the crystallizer C1, the crystallization temperature is -15°C, and the crystallization time is 6hr. After crystallization and filtra...

Embodiment 2

[0029] Adopt the same flow process and raw material composition as embodiment 1. The number of theoretical plates of rectification column B1 is 20, the stream (101) enters from the 12th theoretical plate, the operating pressure is 30KPa, the reflux ratio is 1.2, the temperature at the top of the tower is 193.89°C, and the temperature at the bottom of the tower is 262.08°C. The stream (103) does not contain naphthalene, and the composition of 2,6-diisopropylnaphthalene in weight percentage is 34.74%; the stream (103) enters the crystallizer C1, the crystallization temperature is -20°C, and the crystallization time is 7hr. After suspended crystallization and filtration, the purity of 2,6-diisopropylnaphthalene in weight percent in the crystal of stream (104) is 73.09%; Stream (104) continues to enter crystallizer C2, and solvent is ethanol, and crystallization temperature is 0 ℃, the crystallization time is 7hr, after solvent crystallization, methanol washing, and filtration, dr...

Embodiment 3

[0031] use figure 1 In the flow process shown, the stream (101) is a mixed material liquid containing 2,6-diisopropylnaphthalene, and the composition in weight percentage is: naphthalene 11.39%, monoisopropylnaphthalene 31.53%, 2,6- Diisopropylnaphthalene 20.18%, 2,7-diisopropylnaphthalene 21.19%, other heavy components such as diisopropylnaphthalene and triisopropylnaphthalene 15.71%.

[0032] The number of theoretical plates in rectification column B1 is 25, the stream (101) enters from the 17th theoretical plate, the operating pressure is 5KPa, the reflux ratio is 0.9, the temperature at the top of the tower is 138.27°C, and the temperature at the bottom of the tower is 199.99°C. The stream (103) does not contain naphthalene, and the composition of 2,6-diisopropylnaphthalene in weight percentage is 36.04%; the stream (103) enters the crystallizer C1, the crystallization temperature is -10°C, and the crystallization time is 5hr. After suspended crystallization and filterin...

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Abstract

The invention relates to a separation and purification method for 2,6-diisopropylnaphthalene. The method is mainly used for solving the technical problem that the product purity is low when 2,6-diisopropylnaphthalene is separated and purified in the prior art. According to the adopted technical scheme, the method comprises the following steps that a liquid mixture containing 2,6-diisopropylnaphthalene enters a rectifying tower, naphthalene, isopropylnaphthalene and other light components are removed, the light-component-removed materials enter a first crystallizer, a material flow containing crude 2,6-diisopropylnaphthalene crystals is obtained through a suspension crystallization process, the crude crystals enter a second crystallizer, and a material flow containing the high-purity 2,6-diisopropylnaphthalene product is obtained through a solvent crystallization, washing and drying process. Accordingly, the technical problem is well solved, and the method can be used in industrial production for separating and purifying 2,6-diisopropylnaphthalene.

Description

technical field [0001] The invention relates to a method for separating and purifying 2,6-diisopropylnaphthalene, which can be used in the industrial production of separating and purifying 2,6-diisopropylnaphthalene. Background technique [0002] 2,6-Diisopropylnaphthalene (2,6-DIPN) is an important organic chemical raw material, which can be oxidized to generate 2,6-naphthalene dicarboxylic acid, which can be used to prepare a variety of high-performance polymers. The polyethylene naphthalate (PEN) obtained by ethylene glycol esterification and polycondensation, because the rigidity of the naphthalene ring in the molecular structure is greater than the benzene ring, therefore, compared with the current general-purpose polyethylene terephthalate ( PET), PEN has higher physical and mechanical properties, gas barrier properties, chemical stability and heat resistance, UV resistance, radiation resistance and other properties. It is a high-performance polyester material that can...

Claims

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Application Information

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IPC IPC(8): C07C15/24C07C7/00
Inventor 郭艳姿陈亮陈燕鑫
Owner CHINA PETROLEUM & CHEM CORP
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