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Preparation method of high-dispersity titanium catalyst for polyester synthesis

A titanium-based catalyst and high-dispersity technology, applied in the field of high-dispersity titanium-based catalyst preparation, can solve the problems of poor polyester hue, prolonged polyester synthesis time, and increased by-products, etc.

Active Publication Date: 2021-07-06
ZHEJIANG HENGYI PETROCHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a highly dispersed catalyst system, this transfer process will lead to the agglomeration of catalyst particles, greatly reducing the activity of the catalyst, resulting in prolonged polyester synthesis time, resulting in increased by-products and poor polyester hue

Method used

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  • Preparation method of high-dispersity titanium catalyst for polyester synthesis
  • Preparation method of high-dispersity titanium catalyst for polyester synthesis

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preparation example Construction

[0028] A method for preparing a highly dispersed titanium-based catalyst for polyester synthesis, comprising the following steps: adding water, titanate compounds, organic guanidine compounds and silica gel to form a reaction system in a solvent system composed of organic alcohols, and carrying out The hydrolysis reaction of titanate yields a highly dispersed titanium-based catalyst.

[0029] Described organic alcohol is monohydric alcohol and / or polyhydric alcohol; Described monohydric alcohol is one or more in methanol, ethanol, propanol, butanol, pentanol, and described polyhydric alcohol is ethylene glycol, propylene glycol, glycerine One or more of alcohol, butylene glycol, and isoprene glycol. The titanate compound is ethyl titanate and / or butyl titanate. The organic guanidine compounds are monoguanidine compounds and / or polyguanidine compounds. The specific surface area of ​​the silica gel is greater than 50m 2 / g, the particle size is less than 200nm.

[0030] The ...

Embodiment 1

[0032] A method for preparing a highly dispersed titanium-based catalyst for polyester synthesis, comprising the following steps:

[0033] Add 250mL of ethylene glycol into the three-necked bottle, add 10g of water, 0.5g of guanidine phosphate, and 2g of silica gel (the specific surface area is 200m 2 / g, the average particle size is 10nm). After stirring evenly, 1 g of butyl titanate was added dropwise, and the reaction was stirred for 48 hours to obtain a highly dispersed titanium-based catalyst.

Embodiment 2

[0035] A method for preparing a highly dispersed titanium-based catalyst for polyester synthesis, comprising the following steps:

[0036] Add 250mL of methanol into the three-necked flask, then add 5g of water, 0.1g of guanidine carbonate, and 2g of silica gel (the specific surface area is 200m 2 / g, the average particle size is 10nm). After uniform stirring, 2 g of butyl titanate was added dropwise, and the reaction was stirred for 60 hours to obtain a highly dispersed titanium-based catalyst.

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Abstract

The invention relates to the technical field of titanium catalysts, and discloses a preparation method of a high-dispersity titanium catalyst for polyester synthesis. The preparation method comprises the following steps: adding water, a titanate compound and an organic guanidine compound into a solvent system formed by organic alcohol to form a reaction system, and carrying out a titanate hydrolysis reaction to obtain the high-dispersity titanium catalyst. The titanium catalyst prepared by the invention can be directly used for polyester synthesis, and agglomeration in the process of transferring water to an organic solvent can be avoided, so the prepared polyester has better hue; and moreover, the organic guanidine compound is adopted as the catalyst, and silica gel is added into a reaction system, so the situation that the titanium catalyst does not need to be agglomerated and is too large in size in the preparation process can be avoided, the prepared titanium catalyst has relatively high catalytic activity, and polyester prepared from the titanium catalyst is relatively good in hue.

Description

technical field [0001] The invention relates to the technical field of titanium-based catalysts, in particular to a method for preparing a high-dispersion titanium-based catalyst used for polyester synthesis. Background technique [0002] The catalysts currently used industrially in the production of polyester mainly include antimony-based and titanium-based catalysts. Antimony-based catalysts include antimony trioxide, antimony acetate, antimony glycol, etc., which are more commonly used in industrial production. However, the potential hazards of antimony compounds reduce their applicability in industries such as food. Therefore, high-quality polyester production is often more inclined to use titanium-based catalysts. [0003] The inorganic salts of Ti (such as potassium fluorotitanate, potassium titanium oxalate, etc.) or organic esters (such as tetrabutyl titanate, etc.) of Ti were used early in the Ti-based catalysts. These catalysts have good dispersibility in the po...

Claims

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Application Information

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IPC IPC(8): C08G63/85C08G63/87C08G63/183
CPCC08G63/85C08G63/87C08G63/183
Inventor 蒋新王松林张含刘雨杜玮辰
Owner ZHEJIANG HENGYI PETROCHEM
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