Preparation method and use of rare earth coated titanium polyesterification catalyst

Abstract

The invention provides a preparation method and use of a rare earth coated titanium polyesterification catalyst. The preparation method comprises: heating a solvent to a certain temperature; dissolving a titanate, a phosphate, a silicate ester and other metal compounds in the organic solvent, stirring, keeping the temperature, dripping a small amount of water to promote hydrolysis and obtaining ared precipitate; and repeatedly washing the obtained red precipitate with acetone, removing residual ethanediol, drying the precipitate at 70 DEG C under vacuum and obtaining red powdered catalyst. The polyester prepared by using the catalyst has good hue, other properties of the titanium catalyst are also improved, the catalyst does not contain toxic stibium compounds, and therefore the toxicityof the stibium compounds to the environment and human body is eliminated. The preparation method is mainly to solve the technical problem of the conventional polyesterification process and the yellowing problem of polyethylene glycol terephthalate (PET) and improve the quality of the polyester.

Description

technical field

[0001] The present invention relates to a preparation method of a catalyst and its application, in particular to a preparation method of a rare earth-wrapped titanium series polyester catalyst modified by tetraethyl orthosilicate and trimethyl phosphate and The application thereof belongs to the field of polyester catalysts. Background technique

[0002] Polyethylene terephthalate (referred to as polyester, namely PET) is widely used due to its various excellent properties, especially polyester fiber is the largest variety of synthetic fiber and has been dominating the chemical fiber market. The polyester industry has always been the focus of the development of my country's chemical fiber industry, with an annual growth rate of more than 10%. It is estimated that by 2005, my country's polyester production capacity will exceed 15 million tons per year. In the past few years, due to the strong demand, major polyester manufacturers have expanded their productio...

Examples

Embodiment example 1

[0022] For the preparation of rare earth-wrapped titanium series polyester catalyst, the solvent is first heated to a certain temperature, and then tetrabutyl titanate, trimethyl phosphate, tetraethyl orthosilicate, cerium chloride, and lanthanum chloride are dissolved in In ethylene glycol, wherein: the mass ratio of trimethyl phosphate to titanate is 9:1, the molar ratio of tetraethylorthosilicate to titanate is 1:2, cerium chloride, The molar ratio of lanthanum chloride to titanate is 1:1:10; the amount of ethylene glycol is 2500ml / molTi, the constant reaction temperature is 190°C, and the stirring speed is 2000r / min; at the same time, a small amount of water is added dropwise to promote For hydrolysis, the amount of water used is 250ml / molTi, and the pH value of the water is 8, the time of dropping is within 25min, stirring, constant temperature, the red precipitate obtained is washed repeatedly with acetone to remove the residual ethylene glycol, and finally the precipitat...

Embodiment example 2

[0025] For the preparation of rare earth-wrapped titanium series polyester catalyst, the solvent is first heated to a certain temperature, and then tetrabutyl titanate, trimethyl phosphate, tetraethyl orthosilicate, cerium chloride, and lanthanum chloride are dissolved in In ethylene glycol, wherein: the mass ratio of trimethyl phosphate to titanate is 9:1, the molar ratio of tetraethylorthosilicate to titanate is 1:2, cerium chloride, The molar ratio of lanthanum chloride to titanate is 1:1:10; the amount of ethylene glycol is 2600ml / molTi, the constant reaction temperature is 190°C, and the stirring speed is 3000r / min; at the same time, a small amount of water is added dropwise to promote For hydrolysis, the amount of water used is 260ml / molTi, and the pH value of the water is 8.5. The time of adding drops is within 30min, stirring and constant temperature. The red precipitate is washed repeatedly with acetone to remove the residual ethylene glycol, and finally the precipitat...

Embodiment example 3

[0028] For the preparation of rare earth-wrapped titanium series polyester catalyst, the solvent is first heated to a certain temperature, and then tetrabutyl titanate, trimethyl phosphate, tetraethyl orthosilicate, cerium chloride, and lanthanum chloride are dissolved in In ethylene glycol, wherein: the mass ratio of trimethyl phosphate to titanate is 9:1, the molar ratio of tetraethylorthosilicate to titanate is 1:2, cerium chloride, The molar ratio of lanthanum chloride to titanate is 1:1:10; the amount of ethylene glycol is 2500ml / molTi, the constant reaction temperature is 190°C, and the stirring speed is 3000r / min; at the same time, a small amount of water is added dropwise to promote Hydrolysis, the amount of water is 260ml / molTi, and the pH value of water is 8, the time of dropping is within 25-30min, stirring, constant temperature, the red precipitate obtained is washed repeatedly with acetone to remove residual ethylene glycol, and finally Dry the precipitate under v...

technical field

[0001] The present invention relates to a preparation method of a catalyst and its application, in particular to a preparation method of a rare earth-wrapped titanium series polyester catalyst modified by tetraethyl orthosilicate and trimethyl phosphate and The application thereof belongs to the field of polyester catalysts. Background technique

[0002] Polyethylene terephthalate (referred to as polyester, namely PET) is widely used due to its various excellent properties, especially polyester fiber is the largest variety of synthetic fiber and has been dominating the chemical fiber market. The polyester industry has always been the focus of the development of my country's chemical fiber industry, with an annual growth rate of more than 10%. It is estimated that by 2005, my country's polyester production capacity will exceed 15 million tons per year. In the past few years, due to the strong demand, major polyester manufacturers have expanded their productio...

Examples

Embodiment example 1

[0022] For the preparation of rare earth-wrapped titanium series polyester catalyst, the solvent is first heated to a certain temperature, and then tetrabutyl titanate, trimethyl phosphate, tetraethyl orthosilicate, cerium chloride, and lanthanum chloride are dissolved in In ethylene glycol, wherein: the mass ratio of trimethyl phosphate to titanate is 9:1, the molar ratio of tetraethylorthosilicate to titanate is 1:2, cerium chloride, The molar ratio of lanthanum chloride to titanate is 1:1:10; the amount of ethylene glycol is 2500ml / molTi, the constant reaction temperature is 190°C, and the stirring speed is 2000r / min; at the same time, a small amount of water is added dropwise to promote For hydrolysis, the amount of water used is 250ml / molTi, and the pH value of the water is 8, the time of dropping is within 25min, stirring, constant temperature, the red precipitate obtained is washed repeatedly with acetone to remove the residual ethylene glycol, and finally the precipitat...

Embodiment example 2

[0025] For the preparation of rare earth-wrapped titanium series polyester catalyst, the solvent is first heated to a certain temperature, and then tetrabutyl titanate, trimethyl phosphate, tetraethyl orthosilicate, cerium chloride, and lanthanum chloride are dissolved in In ethylene glycol, wherein: the mass ratio of trimethyl phosphate to titanate is 9:1, the molar ratio of tetraethylorthosilicate to titanate is 1:2, cerium chloride, The molar ratio of lanthanum chloride to titanate is 1:1:10; the amount of ethylene glycol is 2600ml / molTi, the constant reaction temperature is 190°C, and the stirring speed is 3000r / min; at the same time, a small amount of water is added dropwise to promote For hydrolysis, the amount of water used is 260ml / molTi, and the pH value of the water is 8.5. The time of adding drops is within 30min, stirring and constant temperature. The red precipitate is washed repeatedly with acetone to remove the residual ethylene glycol, and finally the precipitat...

Embodiment example 3

[0028] For the preparation of rare earth-wrapped titanium series polyester catalyst, the solvent is first heated to a certain temperature, and then tetrabutyl titanate, trimethyl phosphate, tetraethyl orthosilicate, cerium chloride, and lanthanum chloride are dissolved in In ethylene glycol, wherein: the mass ratio of trimethyl phosphate to titanate is 9:1, the molar ratio of tetraethylorthosilicate to titanate is 1:2, cerium chloride, The molar ratio of lanthanum chloride to titanate is 1:1:10; the amount of ethylene glycol is 2500ml / molTi, the constant reaction temperature is 190°C, and the stirring speed is 3000r / min; at the same time, a small amount of water is added dropwise to promote Hydrolysis, the amount of water is 260ml / molTi, and the pH value of water is 8, the time of dropping is within 25-30min, stirring, constant temperature, the red precipitate obtained is washed repeatedly with acetone to remove residual ethylene glycol, and finally Dry the precipitate under v...