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Method for refining 2, 6-diisopropylnaphthalene

A technology of diisopropylnaphthalene and isopropylnaphthalene, which is applied in the field of refining 2,6-diisopropylnaphthalene, can solve the problems of difficult industrial application, low product purity, complicated process, etc., and achieves good fraction cutting effect, Improve product quality and improve the effect of chroma

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

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Problems solved by technology

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

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, Other diisopropylnaphthalene 23.58% and other light and heavy components 5.19%.

[0028] The number of theoretical plates of the rectification tower 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; The number of theoretical plates of B2 is 30, the stream (103) 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 218.82°C, and the temperature at the bottom of the tower is 267.87°C; after separation, the stream (104) The composition of 2,6-diisopropylnaphthale...

Embodiment 2

[0030] Adopt the same flow process and raw material composition as embodiment 1. The number of theoretical plates of the rectifying tower 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 number of theoretical plates of B2 is 20, the stream (103) enters from the 12th theoretical plate, the operating pressure is 30KPa, the reflux ratio is 0.8, the temperature at the top of the tower is 258.26°C, and the temperature at the bottom of the tower is 308.90°C; after separation, the stream (104) The composition of 2,6-diisopropylnaphthalene in the medium is 39.28% by weight; the stream (104) enters the primary suspension crystallization unit, the crystallization temperature is -15°C, and the crystallization time is 6hr. After suspension crystallization and filtration, In the crystal of stream (10...

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%, Other diisopropylnaphthalene 38.26% and other light and heavy components 6.43%.

[0033] The number of theoretical plates of the rectifying tower 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 number of theoretical plates of B2 is 25, the stream (103) enters from the 17th theoretical plate, the operating pressure is 5KPa, the reflux ratio is 0.5, the temperature at the top of the tower is 197.50°C, and the temperature at the bottom of the tower is 247.90°C; after separation, the stream (104) The composition of 2,6-diisopropylnaphthalene in the mediu...

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Abstract

The invention relates to a method for refining 2, 6-diisopropylnaphthalene. The method solves the technical problem that the existing separation purification method produces low purity and low yield 2, 6-diisopropylnaphthalene. The method comprises respectively removing light and heavy components in an isopropylnaphthalene mixed material liquid from a reaction unit through a first rectification tower and a second rectification tower, feeding the isopropylnaphthalene mixed material liquid into a primary crystallization unit, carrying out suspension crystallization to obtain crude 2, 6-diisopropylnaphthalene crystals, feeding the crude 2, 6-diisopropylnaphthalene crystals into a secondary crystallization unit, carrying out solvent crystallization, washing and drying to obtain a high-purity 2, 6-diisopropylnaphthalene product, and recycling the light and heavy components obtained by rectification, the primary crystallization mother liquid and the secondary crystallization mother liquid subjected to solvent removal to the reaction unit for a reaction of 2, 6-diisopropylnaphthalene production. The method well solves the above problem and can be used for industrial production of separation 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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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/24C07C7/00C07C7/04C07C7/14
Inventor 陈亮郭艳姿陈燕鑫蔡立鑫
Owner CHINA PETROLEUM & CHEM CORP
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