Method for refining 2,6-diisopropylnaphthalene

A technology of diisopropylnaphthalene and refining method, which is applied in the field of refining 2,6-diisopropylnaphthalene, can solve problems such as difficult industrial application, low product purity, complicated process, etc., to improve reaction conversion rate and product The effect of yield, guaranteed product purity, and simple process

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 process flow, low product purity, l

Method used

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  • Method for refining 2,6-diisopropylnaphthalene
  • Method for refining 2,6-diisopropylnaphthalene
  • Method for refining 2,6-diisopropylnaphthalene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] use figure 1 In the flow process shown, the stream (101) is the reaction product from the reaction unit, and its composition in weight percent is: 16.83% of naphthalene, 39.06% of monoisopropylnaphthalene, 15.34% of 2,6-diisopropylnaphthalene, 2,7-Diisopropylnaphthalene 23.58% and other light and heavy components 5.19%.

[0028] The number of theoretical plates of rectification column B1 is 30, the stream (101) enters from the 22nd theoretical plate, the operating pressure is 10KPa, the reflux ratio is 1.0, the temperature at the top of the tower is 155.95°C, and the temperature at the bottom of the tower is 221.61°C. After separation, the stream (103) does not contain naphthalene, and the composition of 2,6-diisopropylnaphthalene is 34.78% by weight; the stream (103) enters the primary suspension crystallization unit, the crystallization temperature is -15°C, and the crystallization time is 6hr. After suspended crystallization and filtration, the purity of 2,6-diisopr...

Embodiment 2

[0030] 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 2.3, the temperature at the top of the tower is 192.64°C, and the temperature at the bottom of the tower is 261.36°C. The stream (103) does not contain naphthalene, and the composition of 2,6-diisopropylnaphthalene is 34.78% by weight; the stream (103) enters the primary suspension crystallization unit, 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 73.13%; stream (104) continues to enter secondary solvent crystallization unit, solvent is methanol, The crystallization temperature is 0°C, and the crystallization time is 7hr. After solvent crystallization...

Embodiment 3

[0032] use figure 1 In the flow process shown, the stream (101) is the reaction product from the reaction unit, and its composition in weight percent is: naphthalene 8.67%, monoisopropylnaphthalene 20.47%, 2,6-diisopropylnaphthalene 26.17%, 2,7-Diisopropylnaphthalene 38.26% and other light and heavy components 6.43%.

[0033] The number of theoretical plates of the rectifying column B1 is 25, the stream (101) enters from the 17th theoretical plate, the operating pressure is 5KPa, the reflux ratio is 1.5, the temperature at the top of the tower is 136.20°C, and the temperature at the bottom of the tower is 199.48°C. The stream (103) does not contain naphthalene, and the composition of 2,6-diisopropylnaphthalene is 36.91% by weight; the stream (103) enters the primary suspension crystallization unit, the crystallization temperature is -9°C, and the crystallization time is 5hr , after suspended crystallization and filtration, the purity of 2,6-diisopropylnaphthalene in weight pe...

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Abstract

The invention relates to a method for refining 2,6-diisopropylnaphthalene, and is used for mainly solving the technical problems of low purity and low yield of products during separation and purification of 2,6-diisopropylnaphthalene in the prior art. The technical problems are relatively well solved by adopting the technical scheme comprising that the method comprises the following steps: allowing an isopropylnaphthalene mixed material liquid from a reaction unit to enter a rectifying tower, removing naphthalene, monoisopropylnaphthalene and other light components, then allowing the product to enter a primary crystallization unit, and carrying out suspension crystallization to obtain a crude 2,6-diisopropylnaphthalene crystal; allowing the crude crystal to enter a secondary crystallization unit, carrying out solvent crystallization, washing and drying to obtain the high-purity 2,6-diisopropylnaphthalene product; circulating the light components of the refining process, a primary crystallization mother liquor and a secondary crystallization mother liquor having a solvent removed back to the reaction unit, continuing to carry out the reaction to generate 2,6-diisopropylnaphthalene. The method can be used for industrial production of separation and purification of 2,6-diisopropylnaphthalene.

Description

technical field [0001] The invention relates to a method for refining 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, can be processed into films, fibers, hollow containers and sheets, e...

Claims

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Application Information

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IPC IPC(8): C07C15/24C07C7/04C07C7/14C07C7/00
Inventor 郭艳姿陈亮陈燕鑫
Owner CHINA PETROLEUM & CHEM CORP
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