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Catalyst for producing poly(trimethylene terephthalate), preparation method and application

A technology of polytrimethylene terephthalate and catalyst, which is applied in the field of preparing this catalyst, can solve the problems of deactivation of titanium compounds, changing the balance of polytrimethylene terephthalate, and no mention, etc., and achieve good technical effects Effect

Active Publication Date: 2020-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 poly(trimethylene terephthalate), preparation method and application
  • Catalyst for producing poly(trimethylene terephthalate), preparation method and application
  • Catalyst for producing poly(trimethylene terephthalate), preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Mix 142g of tetraisopropyl titanate with 124g of ethylene glycol and 22.5g of tartaric acid, and react for 4 hours at a temperature of 100°C in a stirred reactor, add 37g of zinc lactate to the reactant, In the reaction 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 off to make a catalyst. The catalyst is mixed with 1,3-propanediol, wherein the mass fraction of titanium atoms is 4%.

[0048] 600 grams of terephthalic acid, 440 grams of 1,3 propylene glycol, catalyzer 1.49g and stabilizing agent phosphoric acid (50ppm relative to terephthalic acid) are mixed and made into slurry, join in the polymerization still, carry out esterification reaction, esterification temperature is 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 completed, t...

Embodiment 2-4

[0051] Adopt the catalyst preparation method identical with embodiment 1, difference is that the addition amount of tartaric acid is respectively 75g, 120g and 190g.

Embodiment 5-6

[0053] The same catalyst preparation method as in Example 1 was adopted, except that 172 g of 1,3 propanediol and 180 g of 1,4 butanediol were used as straight chain diols.

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Abstract

The invention relates to a catalyst for producing poly(trimethylene terephthalate). The problem of shortage of a catalyst which is suitable for producing poly(trimethylene terephthalate) with low-content cyclic dimer in the prior art is solved mainly. The catalyst is applied to production of at least one of the substances which have general formulas of (I), (II), (III) and (IV), wherein in the formula (I), R5 and R6 are linear alkyl groups with 2-12 carbon atoms, R7 has 2-8 carbon atoms and 1-2 carboxyl groups, the molar ratio of titanium atoms to R7 is 0.1<R7 / Ti<0.5, and M is at least one metal element of magnesium, aluminum, zinc and zirconium; in the formula (III), R5 and R6 are linear alkyl groups with 2-12 carbon atoms. Through the technical scheme, the problem can be solved well, andthe catalyst can be applied to industrial production of poly(trimethylene terephthalate) with the low-content cyclic dimer.

Description

technical field [0001] The invention relates to a catalyst composition which can be used to manufacture poly(trimethylene terephthalate), which can reduce the production effect of cyclic dimers in poly(trimethylene terephthalate), and also relates to a method for preparing the catalyst. Background technique [0002] During the preparation of polytrimethylene terephthalate (PTT), it is inevitable to form a structure with a low degree of polymerization, in which the cyclic dimer structure formed by terephthalic acid and 1,3 propanediol has high thermal stability It will be mixed in the polytrimethylene terephthalate polymer, and its content reaches about 3% of the weight ratio of the polymer under the conventional process, and it will continue to exist during the polymerization and processing. The compatibility between cyclic dimers and poly(trimethylene terephthalate) polymers is poor, and high content of cyclic dimers and cyclic oligomers will migrate to the surface of the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/85C08G63/183C07F7/28
CPCC07F7/003C08G63/183C08G63/85
Inventor 周文乐熊金根宋歌周芬章瑛虹
Owner CHINA PETROLEUM & CHEM CORP
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