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Method for controlling polymerization in rectification process of 1,4-cyclohexanedimethanol

A cyclohexane dimethanol and rectification process technology, which is applied in the field of 1,4-cyclohexane dimethanol rectification, can solve problems such as inability to reach and limit

Active Publication Date: 2012-11-28
江苏恒祥化学股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The crude product of 1,4-cyclohexanedimethanol obtained directly from the reaction cannot meet the requirements of content>99.9%, colorless and transparent, which limits the development of 1,4-cyclohexanedimethanol and its downstream products to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0012] Add 2t of 1,4-cyclohexanedimethanol to the storage tank of the rectification tower, use a rectification tower with a tower height of 12m and a tower diameter of 0.8m for rectification, turn on the heat transfer oil to raise the temperature, and turn on the vacuum foundation to make the vacuum of the tower The temperature reaches -0.100MPa, maintain the temperature at the top of the tower at 180°C-190°C, and the temperature at the bottom of the tower at 200-210°C, stop the rectification when there is no liquid at the top of the tower, and obtain 1.81t of transparent and colorless 1,4-cyclohexanedimethanol , The chromatographic content is 99.9%.

example 2

[0014] Add 2t of 1,4-cyclohexanedimethanol to the storage tank of the rectification tower, use a rectification tower with a tower height of 22m and a tower diameter of 0.8m for rectification, turn on the heat transfer oil to raise the temperature, and turn on the vacuum foundation to make the vacuum of the tower The temperature reaches -0.100MPa, maintain the temperature at the top of the tower at 180°C-190°C, and the temperature at the bottom of the tower at 200-210°C, stop the rectification when there is no liquid at the top of the tower, and obtain 1.23t transparent and colorless 1,4-cyclohexanedimethanol , The chromatographic content is 99.9%.

example 3

[0016] Add 2t of 1,4-cyclohexanedimethanol to the storage tank of the rectification tower, add 1kg of hydroquinone, use a rectification tower with a tower height of 12m and a tower diameter of 0.8m for rectification, turn on the heat transfer oil to raise the temperature, turn on Vacuum foundation, make the vacuum degree of the tower reach -0.100MPa, maintain the temperature at the top of the tower at 180°C-190°C, and the temperature at the bottom of the tower at 200-210°C, stop rectification when there is no liquid at the top of the tower, and obtain 1.88t transparent and colorless 1, 4-Cyclohexanedimethanol, chromatographic content 99.9%.

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Abstract

The invention relates to a method for controlling polymerization in a rectification process of 1,4-cyclohexanedimethanol. A rectification method is mainly adopted. The method is characterized in that a rectification tower with the height of 12 meters and the diameter of 0.8 meter is used, and 2,5-ditertbutyl hydroquinone polymerization inhibitor is rectified in vacuum of 0.100MPa below zero. The invention has the advantages that the colorless and transparent 1,4-cyclohexanedimethanol of which the content is more than 99.9 percent can be obtained by adopting the method. The method is adopted by the following reasons that when a crude product is rectified, because the boiling point of the 1,4-cyclohexanedimethanol is 286 DEG C, the 1,4-cyclohexanedimethanol is dehydrated and polymerized very seriously at a high temperature, and the yield (the rectification yield is about 90 percent) of the 1,4-cyclohexanedimethanol is greatly affected; and by using the rectification tower with the height of 12 meters and the diameter of 0.8 meter and adding the 2,5-ditertbutyl hydroquinone polymerization inhibitor in the vacuum of 0.100MPa below zero, high-temperature dehydration and polymerization of the 1,4-cyclohexanedimethanol are greatly reduced, and the rectification yield is over 97 percent.

Description

technical field [0001] The invention relates to a method for rectifying 1,4-cyclohexanedimethanol, in particular to a method for rectifying 1,4-cyclohexanedimethanol by adopting a rectification tower. Background technique [0002] The saturated polyester resin produced with 1,4-cyclohexanedimethanol as raw material has many excellent properties in coatings and coatings, which can improve the crystallinity of polyester resin, which is the stability and sintering resistance of powder coatings. Sex is improved. In addition, 1,4-cyclohexanedimethanol can also be used in the production of unsaturated polyester resin for sheet and film compounds, and the product has good stability, electrical properties and corrosion resistance. It is widely used in the production of films, resins for electronic products, and insulating wires. [0003] The crude 1,4-cyclohexanedimethanol obtained directly from the reaction cannot meet the requirements of content>99.9% and colorless and transp...

Claims

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Application Information

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IPC IPC(8): C07C31/27C07C29/80C07C29/94
Inventor 邱志刚朱亮
Owner 江苏恒祥化学股份有限公司
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