Composite catalyst and polytrimethylene terephthalate preparation method

A technology of polytrimethylene terephthalate and polytrimethylene terephthalate, which is applied in the field of composite catalyst and preparation of polytrimethylene terephthalate, can solve the problem that the intrinsic viscosity is difficult to achieve satisfaction, it is not suitable for industrial applications, and the reaction is difficult Control and other issues, to achieve the effect of reducing coordination and complexing ability, non-toxic price, and fast reaction speed

Active Publication Date: 2015-07-15
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The inventive new type of catalysis material described by our company provides benefits such as improved thermal stability during use, reduced volatile organic compounds (VOCs) emissions from reactions involving certain chemical substances, lowered vapor pressure compared to existing materials for better control over reactants' properties, longer lifespan without requiring frequent maintenance, less expensive raw materials that produce no harmful waste when discarded after being utilized once more, and easy availability on sale globals.

Problems solved by technology

This patented technical problem addressed by this patents relates to finding an efficient way to produce polytrimetrahydrofuranon acid or other types of molecules that can be useful in various areas like medicine, electronics, energy storage devices, sensors, etc., without causing environmental concerns during manufacturing processes.

Method used

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  • Composite catalyst and polytrimethylene terephthalate preparation method
  • Composite catalyst and polytrimethylene terephthalate preparation method
  • Composite catalyst and polytrimethylene terephthalate preparation method

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Embodiment approach

[0038] image 3 It shows the experimental equipment and corresponding process flow for preparing polytrimethylene terephthalate with terephthalic acid and 1,3-propanediol as raw materials. The reactor 1 is equipped with a stirrer 28, and the reactor is provided with a feeding hopper 2 , the measured material is sent into the reactor through the feeding hopper, and the entire reaction process of beating, esterification and polycondensation (initial polycondensation and final polycondensation) is completed in the reactor, and an agitator drive motor 10 is arranged above the reactor. Drive the agitator to work according to the process needs. In a preferred embodiment, the end point of the polycondensation reaction can be judged by the electric current of the stirrer driving motor. This judgment method is simple, convenient and effective, and is convenient for automatic control. The bearing part of the agitator should be provided with a shaft seal and equipped with a shaft seal s...

Embodiment 1

[0054]Embodiment 1: first utilize high-purity nitrogen to displace reactor 2 times, under the protection of high-purity nitrogen, drop into terephthalic acid 2492g (15mol), 1,3-propanediol 1484g (19.5mol), and add composite catalyst tetra-titanate Butyl ester / bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite, the amount of n-butyl titanate is 2000ppm, the amount of bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite is 2200ppm. Elevate the temperature to carry out the esterification reaction, the temperature is 235°C, and the pressure is 200kPa. Esterification water is distilled out at the same time. After the theoretical amount of esterification water is removed, the temperature is raised to 250°C, and the absolute pressure is slowly reduced to about 2kPa, and enters the pre-condensation stage for about 30 minutes. After the pre-polycondensation is completed, further vacuumize and enter the final polycondensation stage. The temperature is kept at 250°C, and the pre...

Embodiment 2

[0055] Example 2: First, use high-purity nitrogen to replace the reactor for 2 times, under the protection of high-purity nitrogen, put in 2492g (15mol) of terephthalic acid, 1712g (22.5mol) of 1,3-propanediol, and add the composite catalyst tetra-titanate Butyl ester / bis(2,4,6-tri-tert-butylphenyl)pentaerythritol diphosphite, the amount of n-tetrabutyl titanate is 1500ppm, bis(2,4,6-tri-tert-butylphenyl)pentaerythritol diphosphite Phosphite consumption is 2000ppm. Elevate the temperature to carry out the esterification reaction, the temperature is 235°C, and the pressure is 200kPa. Esterification water is distilled out at the same time. After the theoretical amount of esterification water is removed, the temperature is raised to 250°C, and the absolute pressure is slowly reduced to about 2kPa, and enters the pre-condensation stage for about 30 minutes. After the pre-polycondensation is completed, further vacuumize and enter the final polycondensation stage. The temperature i...

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Abstract

The invention relates to a composite catalyst suitable for preparation of polytrimethylene terephthalate, and a method for preparing polytrimethylene terephthalate by adopting the composite catalyst. The composite catalyst comprises tetra-n-butyl titanate and phosphite according to a preferable mass ratio of 0.6-1.15. Polytrimethylene terephthalate is prepared from terephthalic acid and 1,3-propylene glycol through an esterification reaction and a condensation polymerization reaction with the composite catalyst as a catalyst. Phosphate is added to the catalyst, so the catalysis activity of tetra-n-butyl titanate on the degradation reaction of PTT (polytrimethylene terephthalate) is effectively reduced, and the catalysis selectivity is improved; the composite catalyst used in the preparation of the PTT has the advantages of small amount, low cost, fast reaction speed, mild reaction conditions, and controllable reaction; and the characteristic viscosity of the PTT reaches 0.85-1.07dL/g, and the PTT is white in color.

Description

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Claims

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Application Information

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Owner BC P INC CHINA NAT PETROLEUM CORP
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