Method for achieving high purity separation and refinement by controlling morphology and particle size of 2, 6-dimethylnaphthalene crystals

A technology of dimethylnaphthalene and crystallization temperature, which is applied in crystallization purification/separation, chemical instruments and methods, preparation of organic compounds, etc., can solve problems such as complex procedures, high total fixed investment and production costs, and low yield , to achieve the effects of reducing fixed investment, simplifying operation and high productivity

Inactive Publication Date: 2011-07-13
HYOSUNG CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method using crystallization has problems in that, since the process is complicated, the total amount of fixed investment and production cost is required to be relatively high, which makes the yield low, and uses an expensive solvent

Method used

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  • Method for achieving high purity separation and refinement by controlling morphology and particle size of 2, 6-dimethylnaphthalene crystals
  • Method for achieving high purity separation and refinement by controlling morphology and particle size of 2, 6-dimethylnaphthalene crystals
  • Method for achieving high purity separation and refinement by controlling morphology and particle size of 2, 6-dimethylnaphthalene crystals

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Embodiment Construction

[0030] The 2,6-DMN of the present invention is obtained by: appropriately mixing and dissolving a mixture of dimethylnaphthalene isomers and a selected solvent according to the composition ratio; crystallizing by continuously transferring the obtained mixture to a crystallization unit and separation of 2,6-DMN crystals produced by appropriate controls from the mother liquor. According to the method of the present invention, one crystallization process enables the isolation and purification of high-purity 2,6-DMN with a purity greater than 99.0% by weight.

[0031]In general, in the crystallization process, the crystal morphology, which is one of the important characteristics of the crystal, should vary depending on the use of the crystal. Furthermore, controlling crystal morphology is a key means of isolating specific substances from mixtures. Specifically, by crystallization, isomers having similar boiling points can be easily separated, whereas separation of isomers is a di...

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Abstract

The present invention relates to a method for achieving high purity separation and refinement by controlling morphology and particle size of 2, 6-dimethylnaphthalene. And more particularly, the present invention relates to a method for obtaining high purity 2, 6-dimethylnaphthalene crystals, in which crystallization is carried out with a solvent that enables the crystals to form a square-plate shape. During the process, crystallization variables such as, agitation speed, cooling rate, solvent and composition ratio, are adjusted to control morphology and particle size of 2, 6-dimethylnaphthalene and to remove aggregation, thereby obtaining 2, 6-dimethylnaphthalene crystals of high purity.

Description

technical field [0001] The invention relates to a method for separating and refining high-purity 2,6-dimethylnaphthalene by controlling the morphology and particle size of 2,6-dimethylnaphthalene crystals. Background technique [0002] It is known that polyethylene naphthalate (hereinafter referred to as "PEN") resin has properties such as thermal stability, tensile strength, impact strength and Some properties such as air permeability are relatively excellent. Based on these advantages, PEN is selected as an excellent material for fibers, functional polymers, heat-resistant bottles, films and liquid crystal polymers. 2,6-naphthalene dicarboxylic acid (hereinafter referred to as "2,6-NDA") is the main material used to produce PEN resin, and the most efficient and well-known method of producing 2,6-naphthalene dicarboxylic acid is through 2,6-NDA Oxidation of dimethylnaphthalene (hereinafter referred to as "2,6-DMN"). Therefore, more efficient methods for producing 2,6-DMN...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C15/24
CPCC07C7/14C07C2102/10C07C2602/10C07C15/24
Inventor 千亮镐崔英教
Owner HYOSUNG CORP
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