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Catalyst for producing polytrimethylene terephthalate, and preparation method and application thereof

A technology of polytrimethylene terephthalate and catalyst, which is applied in the field of preparation of this catalyst, can solve the problems of titanium compound deactivation, changing the balance of polytrimethylene terephthalate, no mention, etc.

Active Publication Date: 2018-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent points out that phosphorus compounds can also cause the inactivation of titanium compounds
[0005] In the above reports, there is no mention of changing the equilibrium in the polymerization process of polytrimethylene terephthalate through catalyst structure design, thereby reducing the method of cyclic dimer content

Method used

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  • Catalyst for producing polytrimethylene terephthalate, and preparation method and application thereof
  • Catalyst for producing polytrimethylene terephthalate, and preparation method and application thereof
  • Catalyst for producing polytrimethylene terephthalate, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Mix 142g of tetraisopropyl titanate with 124g of ethylene glycol and 22.5g of tartaric acid, and react for 4 hours at 100°C in a stirred reactor. Add 37g of zinc lactate to the reactant. Medium, react at 120°C for 4 hours. The reaction product is placed in a reactor equipped with a fractionation device, and isopropanol and water are distilled out to prepare a catalyst. The catalyst is mixed with 1,3-propanediol, wherein the mass fraction of titanium atoms is 4%.

[0046] 600 grams of terephthalic acid, 440 grams of 1,3 propylene glycol, 1.49g of catalyst and stabilizer phosphoric acid (50ppm relative to terephthalic acid) were mixed to form a slurry, which was added to the polymerization vessel for esterification reaction. The esterification temperature was 230°C, the pressure is 0.25MPa, the water produced by the reaction is discharged through the rectification device, and the reaction is carried out for 2 hours. After the esterification is over, the pressure is reduced...

Embodiment 2-4

[0049] The same catalyst preparation method as in Example 1 was adopted, except that the addition amount of tartaric acid was 75 g, 120 g, and 190 g, respectively.

Embodiment 5-6

[0051] The same catalyst preparation method as in Example 1 was adopted, except that 172 g of 1,3 propylene glycol and 180 g of 1,4-butanediol were used for linear diols.

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Abstract

The invention relates to a catalyst for producing polytrimethylene terephthalate in order to mainly solve the problem of deficiency of catalysts for producing polytrimethylene terephthalate with lowcontent of cyclic dimer in the prior art. Reactants containing a titanium compound, straight-chain diol, hydroxycarboxylic acid and a metal organic salt are used in the invention, wherein the metal element of the metal organic salt is at least one metal element selected from magnesium, aluminum, zinc and zirconium. A preparation method of the catalyst comprises the following steps: reacting the organic titanium compound with the saturated straight-chain diol and hydroxycarboxylic acid at 10-150 DEG C for 0.1-24 h, adding the metal organic salt to the obtained product, carrying out a reaction at 10-150 DEG C for 0.1-24 h, and removing low-carbon alcohol and / or water in the obtained system to obtain the catalyst for producing polytrimethylene terephthalate The method well solves the problem,and can be used in the industrial production of polytrimethylene terephthalate with low content of the cyclic dimer.

Description

Technical field [0001] The invention relates to a catalyst composition, which can be used to manufacture polytrimethylene terephthalate, which can reduce the production effect of cyclic dimer in the polyterephthalate, and also relates to a method for preparing the catalyst. Background technique [0002] Polytrimethylene terephthalate (PTT) will inevitably form a structure with a low degree of polymerization during the preparation process, and the cyclic dimer structure formed by terephthalic acid and 1,3 propylene glycol has high thermal stability It will be mixed in the polytrimethylene terephthalate polymer, and its content will reach about 3% of the weight of the polymer under conventional technology, and it will continue to exist during the polymerization and processing. The compatibility between cyclic dimer and polytrimethylene terephthalate polymer is poor. High content of cyclic dimer and cyclic oligomer will migrate to the polymer surface during processing, resulting in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/183C08G63/85
CPCC08G63/183C08G63/85
Inventor 宋歌熊金根周芬王睿
Owner CHINA PETROLEUM & CHEM CORP
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