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Preparation method and application of supported titanium-series polyester catalyst

A titanium-based polyester and catalyst technology, applied in the field of polyester catalysts, can solve the problems of many side reactions, product yellowing, turbidity, etc., and achieve the effects of reducing specific surface area, reducing catalytic activity, and reducing side reactions.

Active Publication Date: 2012-03-28
江西省铜鼓县二源化工有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional titanium-based catalysts have good stability and high activity, but many side reactions are caused during the reaction process, and the polyester produced has problems of poor stability and yellowing and turbidity of the product, so it has not been used on a large scale.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Preparation of titanium-based polyester catalyst with low specific surface area: first heat the reaction solvent to a constant temperature with a constant temperature oil bath, and dissolve isopropyl titanate, tributyl phosphate, activated carbon and metal compounds in ethylene glycol, wherein: The mass ratio of the amount of tributyl phosphate added to titanate is 9:1, the molar ratio of activated carbon to titanate is 1:2, and the molar ratio of aluminum chloride to titanate is 1:19; : The consumption of ethylene glycol is 2500ml / molTi, the reaction constant temperature is 190°C, and the stirring speed is 1500r / min; simultaneously, a small amount of water is added dropwise to promote hydrolysis, the consumption of water is 250ml / molTi, and the pH value of water is 8, drop Adding time is within 25 minutes, stirring, and constant temperature; the prepared precipitate is washed with acetone to remove residual ethylene glycol, and finally the precipitate is vacuum-dried at...

Embodiment 2

[0021] Preparation of titanium-based polyester catalyst with low specific surface area: first heat the reaction solvent to a constant temperature with a constant temperature oil bath, and dissolve isopropyl titanate, tributyl phosphate, activated carbon and metal compounds in ethylene glycol, wherein: The mass ratio of the amount of tributyl phosphate added to titanate is 9:1, the molar ratio of activated carbon to titanate is 1:2, and the molar ratio of aluminum chloride to titanate is 1:19; : The consumption of ethylene glycol is 2600ml / molTi, the reaction constant temperature is 200°C, and the stirring speed is 2500r / min; meanwhile, a small amount of water is added dropwise to promote hydrolysis, the consumption of water is 260ml / molTi, and the pH value of water is 8.5, The time for dropping is within 30 minutes, stirring, and constant temperature; the prepared precipitate is washed with acetone to remove residual ethylene glycol, and finally the precipitate is vacuum-dried ...

Embodiment 3

[0024] Preparation of titanium-based polyester catalyst with low specific surface area: first heat the reaction solvent to a constant temperature with a constant temperature oil bath, and dissolve isopropyl titanate, tributyl phosphate, activated carbon and metal compounds in ethylene glycol, wherein: The mass ratio of the amount of tributyl phosphate added to titanate is 9:1, the molar ratio of activated carbon to titanate is 1:2, and the molar ratio of aluminum chloride to titanate is 1:19; : The consumption of ethylene glycol is 2500ml / molTi, the reaction constant temperature is 200°C, and the stirring speed is 3000r / min; meanwhile, a small amount of water is added dropwise to promote hydrolysis, the consumption of water is 260ml / molTi, and the pH value of water is at 8 , dropwise within 30 minutes, stirring, and constant temperature; the prepared precipitate was washed with acetone to remove residual ethylene glycol, and finally the precipitate was vacuum-dried at 70°C to o...

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PUM

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Abstract

The invention discloses a preparation method and application of a supported titanium-series polyester catalyst with low specific surface area. The supported titanium-series polyester catalyst is prepared from titanate, phosphate, activated carbon and other metal compounds; the traditional titanium-series catalyst is modified by silicate; the catalytic activity of the catalyst is lowered and side reaction is reduced by reducing the specific surface area, the pore area and the pore volume of the catalyst; and the hue of the prepared polyester product is good, besides, other properties of the titanium-series catalyst can be improved. The supported titanium-series polyester catalyst is mainly used for solving the technical difficulties in the former ester polymerization process, solving the yellowing problem of PET (polyester) and improving the quality of the PET.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a titanium-based polyester catalyst modified by using activated carbon supported by tributyl phosphate, and belongs to the field of polyester catalysts. Background technique [0002] Polyester is a class of widely used synthetic materials, among which polyethylene terephthalate (PET) has attracted attention due to its good fiber-forming properties. At present, the catalysts used in the industrial production of polyester are mainly antimony compounds, such as antimony trioxide, antimony acetate, and antimony glycol. Compounds containing antimony have attracted widespread attention because they may cause harm to the environment and human body. At present, many foreign PET manufacturers are devoting themselves to the development of new non-heavy metal polyester catalysts, among which titanium-based catalysts have attracted much attention due to their high ...

Claims

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Application Information

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IPC IPC(8): C08G63/87C08G63/85C08G63/84C08G63/183
Inventor 谢宇洪小伟戴玉华邱俊才李坚强陈典平余远福
Owner 江西省铜鼓县二源化工有限责任公司
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