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Method and system for separation and purification of high-purity 2,6-dimethylnaphthalene by continuous crystallization

A technology of dimethylnaphthalene and crystallization, which is applied in the directions of crystallization purification/separation, separation/purification of carboxylic acid compounds, general layout of crystallization devices, etc., which can solve the problems of unsatisfactory purity, purity of physical properties, color deterioration, and low purity. and other problems to achieve the effect of saving energy consumption, reducing fixed investment and reducing production costs

Active Publication Date: 2009-10-28
HYOSUNG CHEM CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The presence of trace impurities in 2,6-dimethylnaphthalene leads to deterioration of the physical properties (such as purity, color, etc.) of 2,6-naphthalene dicarboxylic acid
However, it is reported that 2,6-dimethylnaphthalene separated by this method has a purity of 98% or less, which cannot meet the requirement of purity in the production of 2,6-naphthalene dicarboxylic acid

Method used

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  • Method and system for separation and purification of high-purity 2,6-dimethylnaphthalene by continuous crystallization
  • Method and system for separation and purification of high-purity 2,6-dimethylnaphthalene by continuous crystallization
  • Method and system for separation and purification of high-purity 2,6-dimethylnaphthalene by continuous crystallization

Examples

Experimental program
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Effect test

Embodiment 1

[0060] The reaction mixture containing an average of 42.53 wt% dimethylnaphthalene of 2,6-DMN was transferred to the first solvent mixing tank at a rate of 15 kg / hr. The reaction mixture was mixed with the stock solution separated in the secondary crystallization (for the primary crystallization) until the average solvent ratio reached 4:1. The raw material mixture is introduced into a first crystallization unit and crystallized therein. At this time, the outlet temperature of the first crystallization device was adjusted to 0°C. After primary crystallization, centrifugation was performed to obtain crystals. The crystals were sampled and analyzed. The analysis results are shown in Table 2. The crystals were dissolved in a melt tank at 80°C and transferred to a second solvent mixing tank. The crystals were dissolved using ethanol at a ratio of 8:1 in a second solvent mixing tank, and the solution was then transferred to a secondary crystallization unit at a flow rate of 60 ...

Embodiment 2

[0064] In order to evaluate the effect of the structure of the inner spatula on crystallization, crystallization was obtained in the same manner as in Example 1 except that a spatula of a different structure was used. The average values ​​of the obtained results are shown in Table 3.

[0065] table 3

[0066] DMN isomer mixture

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Abstract

Provided is a method for the separation and purification of high-purity 2,6-dimethylnaphthalene from a reaction mixture of dimethylnaphthalenes by continuous crystallization. According to the method, shell-tubetype crystallization apparatuses are used to perform crystallization operations under a continuous flow of a reaction mixture of dimethylnaphthalenes, which is obtained from the synthesis ofdimethylnaphthalenes using o-xylene and butadiene as starting materials. As a result, high-purity 2,6-dimethylnaphthalene is separated and purified in a high yield from the reaction mixture. In addition, the method is advantageous in terms of energy saving when compared to conventional separation methods and enables continuous separation and purification of 2,6-dimethylnaphthalene on an industrial scale. A system for implementing the method is further provided.

Description

technical field [0001] The present invention relates to a method for separating and purifying high-purity 2,6-dimethylnaphthalene from a reaction mixture of dimethylnaphthalene by continuous crystallization. More specifically, the present invention relates to a method and system for the isolation and purification of high-purity 2,6-dimethylnaphthalene in high yields from a reaction mixture of dimethylnaphthalene composed of ortho-xylene and butadiene The synthesis of dimethylnaphthalene as a starting material is obtained by carrying out the crystallization operation using a shell-and-tube type crystallization device under conditions of continuous flow of the reaction mixture. Background technique [0002] 2,6-Naphthalene dicarboxylic acid (2,6-NDA) is a highly functionalized monomer of polyethylene naphthalate (PEN) resin and is well known as a raw material for liquid crystal polymers. Compared with polyethylene terephthalate (PET) resins currently used in a wide range of a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/42
CPCB01D9/0013C07C7/14B01D9/004B01D9/0059Y02P20/50C07C15/24C07C51/42C07C51/43
Inventor 千亮镐崔英教
Owner HYOSUNG CHEM CORP
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