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Bis-beta-hydroxyethyle terephthalate

A technology of hydroxyethyl terephthalate and methanol solution, which is applied in the field of manufacturing aromatic polyester, and can solve problems that cannot be solved fundamentally

Inactive Publication Date: 2003-11-05
PET REBIRTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, none of these can serve as a fundamental solution

Method used

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  • Bis-beta-hydroxyethyle terephthalate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Put 64 kg of crushed flakes of a used vial (made of polyethylene terephthalate resin) and 450 kg of ethylene glycol (hereinafter referred to as EG) into 1m 3 Add 0.32kg of caustic soda (NaOH) as a transesterification catalyst to an autoclave with a stirrer, depolymerize for 3.3 hours while distilling off a small amount of water and other low boiling point substances under the condition of 220°C and 0.15MPa, and obtain EG as the main Solvent, a solution containing bis-β-hydroxyethyl terephthalate (hereinafter referred to as BHET) as the main solute. This solution was filtered to remove a small amount of inclusions, then cooled to 55° C., and decolorized using activated carbon to obtain 510 kg of the solution. The total cation content relative to the concentrated solute (crude BHET) in the solution was 2.660 ppm, and the total anion content was 23 ppm.

[0037] For this, 210 kg of the solution was decationized at a temperature of 55° C. with a cation-exchange resin (Ambe...

Embodiment 2～4

[0042] For the pulverized flakes of 2 kinds of used vials (made of PET resin) that are different from recovery sources, get 53kg respectively as raw material, add 370kg EG simultaneously, the situation is the same as embodiment 1, but, replace caustic soda with 0.27kg sodium methylate as Depolymerization catalyst, carry out depolymerization, then filter, then carry out decolorization treatment with gac, obtain the crude BHET solution of each 420kg. The total cation contents relative to the crude BHET in the solution were 2,000 ppm and 2,050 ppm, respectively, and the total anion contents were 20 ppm and 22 ppm, respectively.

[0043] The entire amount of the two solutions were decationized and deanionized at a temperature of 55°C, respectively. The ion exchange resin used in the treatment was the same as in Example 1. The total cation contents in the treated solution relative to the crude BHET were 8 ppm and 12 ppm, and the total anion contents were 0 ppm and 1.0 ppm, respect...

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Abstract

Di-beta-hydroxyethyl terephthalate with an optical density of 0.000-0.006 measured under the conditions of a measuring wavelength of 380nm, a measuring cell optical path length of 10mm and a methanol solution with a concentration of 10% by weight. According to the present invention, it can be seen that high-quality PET having excellent purity, whiteness, and transparency can be obtained from purified BHET having an optical density of 0.006 or less.

Description

technical field [0001] The present invention relates to the purification of bis-β-hydroxyethyl terephthalate (Bis-β-Hiderokishie チヒドロキシエルテレフタレ-ト) (hereinafter referred to as BHET) and the use thereof to produce aromatic polyesters, especially polyterephthalate Ethylene glycol formate (hereinafter referred to as PET) method. BHET is widely used in industry as a raw material for polyester PET, which is extremely useful in the fields of various molded products such as fibers, films, and resins. Background technique [0002] Polyesters, particularly polyesters mainly composed of ethylene terephthalate, are widely used in various applications as described above. As its production method, direct esterification of terephthalic acid and ethylene glycol or transesterification via lower alkyl esters of terephthalic acid, especially dimethyl terephthalate and ethylene glycol are actually used at present. , to obtain an intermediate containing BHET, and then usually directly carry out...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/52C07C67/54C07C67/56C07C69/82
CPCC07C67/52C07C67/54C07C67/56C07C69/82
Inventor 稻田修司佐藤菊智
Owner PET REBIRTH CO LTD
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