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Composite catalyst for synthesis of polyethylene glycol terephthalate

A technology of polyethylene terephthalate and composite catalyst, applied in the field of catalysts, can solve the problems of poor thermal stability, yellow color, low catalytic efficiency and the like of PET products

Active Publication Date: 2017-05-03
BEIJING INSTITUTE OF CLOTHING TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Antimony catalysts mainly include antimony trioxide, antimony acetate and antimony glycol. Although the technology of antimony catalysts is relatively mature, it has the advantages of moderate catalytic activity, less side reactions, and low price. However, Sb catalysts are widely used at the same time. There are also some obvious disadvantages: because antimony compounds themselves have certain toxicity and coexist with highly toxic arsenic in nature, the application of Sb catalysts is limited to a certain extent.
[0007] However, the titanium-based catalyst itself has poor stability and is easy to hydrolyze, resulting in poor thermal stability, yellow color, and low catalytic efficiency of PET products produced with it, and has not been used on a large scale.

Method used

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  • Composite catalyst for synthesis of polyethylene glycol terephthalate
  • Composite catalyst for synthesis of polyethylene glycol terephthalate
  • Composite catalyst for synthesis of polyethylene glycol terephthalate

Examples

Experimental program
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Effect test

Embodiment 1

[0050] The preparation of embodiment 1 composite catalyst

[0051] Add 2.23mL of tetraethyl silicate into ethylene glycol, and optionally stir to obtain a diol solution of tetraethyl silicate;

[0052] 1.07 mL of phenylphosphonic acid was added to the above diol solution of tetraethyl silicate, optionally stirred, and then added into 20.47 mL of tetrabutyl titanate to obtain a composite catalyst.

Embodiment 2

[0053] The preparation of embodiment 2 composite catalyst

[0054] Add 2.23mL of tetraethyl silicate into ethylene glycol, and optionally stir to obtain a diol solution of tetraethyl silicate;

[0055] 1.61 mL of phenylphosphonic acid was added to the above diol solution of tetraethyl silicate, optionally stirred, and then added into 27.33 mL of tetrabutyl titanate to obtain a composite catalyst.

Embodiment 3

[0056] Embodiment 3 preparation of composite catalyst

[0057] Add 2.23mL of tetraethyl silicate into ethylene glycol, and optionally stir to obtain a diol solution of tetraethyl silicate;

[0058] 2.14 mL of phenylphosphonic acid was added to the above diol solution of tetraethyl silicate, optionally stirred, and then added into 30.75 mL of tetrabutyl titanate to obtain a composite catalyst.

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Abstract

The invention discloses a composite catalyst for synthesis of polyethylene glycol terephthalate. The composite catalyst comprises tetrabutyl titanate, tetraethyl silicate and phenylphosphonic acid. The composite catalyst catalyzes a PET synthesis reaction, has catalytic activity 17 times or more that of the antimony catalyst, and can be used for production of PET having high molecular weight, narrow molecular weight distribution, good mechanical properties and good thermal stability.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to composite catalysts, in particular to a composite catalyst for synthesizing polyethylene terephthalate. Background technique [0002] Polyethylene terephthalate (PET) is the product of terephthalic acid (PTA) and ethylene glycol (EG) through esterification and polycondensation reactions. It is the largest output and variety of polyester products in my country. A class of synthetic materials used in many fields such as fibers, films, and bottles. [0003] In recent years, with countries and regions such as Europe and the United States, the concept of "green fiber" has been proposed one after another, and environmentally friendly green fiber textiles have become the trend of international development. This trend of green fiber textiles woven from raw materials that are harmless to human health and the environment has threatened the export of my country's textiles. This is because the cata...

Claims

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Application Information

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IPC IPC(8): C08G63/85C08G63/87C08G63/183
CPCC08G63/183C08G63/85C08G63/87
Inventor 王锐张文娟姜虹宇张秀芹朱志国董振峰刘继广
Owner BEIJING INSTITUTE OF CLOTHING TECHNOLOGY