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A kind of titanium-germanium composite catalyst for polyester synthesis and its application

A composite catalyst, titanium germanium technology, which is applied in the field of polyester synthesis, can solve the problems of not being used on a large scale, the yellow hue of polyester products, and the low stability of the catalyst, so as to achieve good industrial application prospects and prevent yellow hue , Improve the effect of stability and activity

Active Publication Date: 2020-11-17
ZHEJIANG HENGYI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Germanium-based catalysts have good catalytic activity, and the polyester obtained is pure white in color, does not contain heavy metals, and is basically pollution-free, but its resources are scarce and expensive
Titanium-based catalysts have high catalytic activity and meet the requirements of non-toxic and environmental protection. However, at present, there are many side reactions in titanium-based catalysts, the color of polyester products is yellow, the catalyst itself is low in stability, and it is easy to hydrolyze. Therefore, it has not been widely used. usage of

Method used

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  • A kind of titanium-germanium composite catalyst for polyester synthesis and its application
  • A kind of titanium-germanium composite catalyst for polyester synthesis and its application

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Effect test

preparation example Construction

[0038] Catalyst preparation:

[0039] 1) At room temperature, the titanium compound is added dropwise into an aqueous hydrochloric acid solution, and stirring is continued for 1-6 hours after the dropwise addition to obtain a titanium dioxide sol. Preferably, the titanium compound is titanium alkoxide, at least one of tetraethyl titanate, tetrapropyl titanate, tetraisopropyl titanate, tetrabutyl titanate, and tetraisooctyl titanate. The concentration of the hydrochloric acid aqueous solution is 0.05-1 mol / L, and the molar ratio of the titanium compound to the hydrochloric acid is 1-10:1.

[0040] 2) At room temperature, germanium tetrachloride was added dropwise to deionized water, and stirring was continued for 12-24 hours after the dropwise addition to obtain a germanium dioxide sol. Preferably, the molar ratio of germanium chloride to deionized water is 0.01˜0.5:1.

[0041] 3) At room temperature, mix the titanium dioxide sol and the germanium dioxide sol, add the mixed s...

Embodiment 1

[0046] At room temperature, 4.5 mmol of tetrabutyl titanate was added dropwise to 20 mL of 0.1 mol / L hydrochloric acid solution, and stirring was continued for 3 h after the dropwise addition to obtain a titanium dioxide sol. Add 1.5 mmol of germanium tetrachloride dropwise to 2.5 mL of deionized water, and continue stirring for 15 h after the dropwise addition to obtain a germanium dioxide sol. Mix the titanium dioxide sol and the germanium dioxide sol, add the mixed sol dropwise into 150 mL ε-caprolactam aqueous solution with a concentration of 0.14 mol / L, and continue stirring for 1 h. The precipitate was obtained by centrifugation, washed with deionized water to remove chloride ions, and vacuum-dried at 100° C. to constant weight to obtain a titanium-germanium composite catalyst. Table 1 shows the performance results of polyester chip products prepared by using this catalyst.

Embodiment 2

[0048] At room temperature, 10 mmol of tetraisopropyl titanate was added dropwise to 20 mL of 0.2 mol / L hydrochloric acid solution, and stirring was continued for 4 h after the dropwise addition to obtain a titanium dioxide sol. Add 5 mmol of germanium tetrachloride dropwise to 8 mL of deionized water, and continue stirring for 20 h after the dropwise addition to obtain a germanium dioxide sol. Mix titanium dioxide and germanium dioxide sol, add the mixed sol dropwise to 300mL citric acid aqueous solution with a concentration of 0.1mol / L, and continue stirring for 2h. The precipitate was obtained by centrifugation, washed with deionized water to remove chloride ions, and vacuum-dried at 80° C. to constant weight to obtain a titanium-germanium composite catalyst. Table 1 shows the performance results of polyester chip products prepared by using this catalyst.

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Abstract

The invention relates to the field of polyester synthesis and discloses a titanium-germanium composite catalyst for polyester synthesis and application thereof. The titanium-germanium composite catalyst is prepared by: mixing titanium dioxide sol and germanium dioxide sol first, dropwise adding the mixed sol into a complexing agent solution, stirring, centrifuging the stirred mixed sol, collectingprecipitate, washing to remove chlorine ions, and drying. Titanium and germanium are combined in special way innovatively wherein; the prepared composite catalyst has excellent stability and activity; side reactions in polyester synthesis can be inhibited effectively; yellowing of polyester products is prevented effectively. The catalyst of the invention has low preparation cost and is easy to popularize and apply.

Description

technical field [0001] The invention relates to the field of polyester synthesis, in particular to a titanium-germanium composite catalyst for polyester synthesis and its application. Background technique [0002] PET polyester, the full name of polyethylene terephthalate, is widely used in fibers, films, and packaging materials due to its good heat resistance, insulation, high resilience, and excellent acid and solvent resistance. , engineering plastics and many other fields, especially its washable, crisp, low price and other characteristics occupy the vast share of the chemical fiber market. The catalyst is an important part of polyester production. It not only affects the speed of esterification, transesterification and polycondensation reactions in the polyester production process, but also has a significant impact on side reactions, thermal stability and product color. [0003] At present, the most widely used polyester catalysts in industrial production are mainly an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/183C08G63/85C08G63/86
CPCC08G63/183C08G63/85C08G63/863
Inventor 汪绪兰杜玮辰
Owner ZHEJIANG HENGYI PETROCHEM
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