Preparation of polyethylene glycol terephthalate for improving color value of product

A technology of polyethylene terephthalate and terephthalic acid, which is applied in the field of preparation of polyethylene terephthalate, can solve the problems of high product b value and high reaction temperature, and improve product quality , Reduce heat energy consumption and save cost

Inactive Publication Date: 2005-07-27
JIANGYIN BOLUN CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the high temperature of the three-pot reaction, it is easy to cause the b value of the product to be high (blue to yellow)

Method used

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  • Preparation of polyethylene glycol terephthalate for improving color value of product
  • Preparation of polyethylene glycol terephthalate for improving color value of product
  • Preparation of polyethylene glycol terephthalate for improving color value of product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The blue agent and the red agent are injected in the slurry feeding tank at a ratio of 0.0035, the esterification temperature is 270°C, the precondensation temperature is 285°C, the absolute pressure is 19-20mmHg, the final polymerization temperature is 287°C, and the absolute pressure is ≤1.3mmHg. The ratio of blue agent to red agent is 1.5:1

Embodiment 2

[0019] The blue agent is injected in the slurry feeding tank at a ratio of 0.0030, the esterification temperature is 260°C, the precondensation temperature is 290°C, the absolute pressure is 20mmHg, the final polymerization temperature is 285°C, and the absolute pressure is ≤1.3mmHg. The ratio of blue agent to red agent is 2:1

Embodiment 3

[0021] The red agent is injected in the slurry feeding tank at a ratio of 0.0028, the esterification temperature is 280°C, the precondensation temperature is 280°C, the absolute pressure is 19.5mmHg, the final polymerization temperature is 295°C, and the absolute pressure is ≤1.3mmHg. The ratio of blue agent to red agent is 2.5:1

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Abstract

Production of poly-terephthalic acid glycol ester for improving product tone is carried out by: agitating terephthalic acid and glycol ester by proportioning in size mixed pot, pumping into size feeding pot, size feeding pot entering into esterifying pot by size inject nozzle, circulating by thermosiphon, size mixing reacting, injecting esterified oligomer and additive on pipeline into pre-polymerization pot, material reaching top of pre-polymerization, flowing into terminal-polymerization pot, filtering the product in melt filter, and removing cast heads to dicing cutter. It is characterized by adding blue agent or / and red agent and controlling its content in section 0-1PPM. It achieves low cost and heat energy consumption, and higher product quality.

Description

Technical field: [0001] The invention relates to a preparation method of polyethylene terephthalate capable of improving product color value. Background technique: [0002] Polyethylene terephthalate is mainly used in the production of base materials for bottle-grade chips and fiber-grade chips. Its production process is: [0003] Purified terephthalic acid and ethylene glycol are stirred in the slurry in the slurry mixing tank according to the set density or molar ratio, pumped into the slurry feeding tank, and the slurry feeding tank enters the esterification tank through the slurry injection nozzle , through the circulation of the thermosiphon, the slurry is uniformly mixed and reacted. The esterified oligomer and the additives on the pipeline are injected into the prepolymerization tank through the gear pump. The prepolymerization kettle is an upflow turret tower, the reaction temperature is 280~290℃, and the absolute pressure is 19~20mmHg. When the material reaches t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/78
Inventor 薛纪良
Owner JIANGYIN BOLUN CHEM FIBER
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