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Polytrimethylene terephthalate and production method thereof

A technology of polytrimethylene terephthalate and propylene glycol, which is applied in the field of producing polytrimethylene terephthalate and polytrimethylene terephthalate, can solve the problems of many by-products and poor product quality, and improve esterification rate, fewer side effects

Active Publication Date: 2015-05-20
ZHANGJIAGANG GLORY CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] After in-depth research, the inventors of the present invention found that when the existing three-pot process technology is used for the production of polytrimethylene terephthalate, there are basically many by-products and the defects of poor product quality.

Method used

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  • Polytrimethylene terephthalate and production method thereof
  • Polytrimethylene terephthalate and production method thereof
  • Polytrimethylene terephthalate and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment is used to illustrate the method for producing poly(trimethylene terephthalate) provided by the invention.

[0044] Mix PDO with PTA and an esterification catalyst (the molar ratio of PDO to PTA is 3:1, the esterification catalyst is tetraisopropyl titanate, and the addition amount of the esterification catalyst is 100ppm, the same below) from the raw material inlet 1a Introduce initial esterification reaction chamber 11 and carry out initial esterification reaction, the temperature in initial esterification reaction chamber 11 is controlled at 250 ℃, and pressure is controlled at 60kPa, when esterification rate reaches 95%, initial esterification reaction product is from The raw material conversion port 1b is introduced into the final esterification reaction chamber 12 to carry out the final esterification reaction. The temperature in the final esterification reaction chamber 12 is controlled at 245° C., and the pressure is controlled at 60 kPa. When the...

Embodiment 2

[0049] This embodiment is used to illustrate the method for producing poly(trimethylene terephthalate) provided by the invention.

[0050] PDO, PTA and esterification catalyst are mixed and introduced into the initial esterification reaction chamber 11 from the raw material inlet 1a to carry out the initial esterification reaction. The temperature in the initial esterification reaction chamber 11 is controlled at 235 °C and the pressure is controlled at 20 kPa. When the conversion rate reaches 93%, the initial esterification reaction product is introduced into the final esterification reaction chamber 12 from the raw material conversion port 1b to carry out the final esterification reaction, and the temperature in the final esterification reaction chamber 12 is controlled at 230 ° C, and the pressure is controlled at 20kPa, when the esterification rate reached 97%, the final esterification reaction product was introduced from the raw material outlet 1c and the material inlet 2a...

Embodiment 3

[0055] This embodiment is used to illustrate the method for producing poly(trimethylene terephthalate) provided by the invention.

[0056] PDO, PTA and esterification catalyst are mixed and introduced into the initial esterification reaction chamber 11 from the raw material inlet 1a to carry out the initial esterification reaction. The temperature in the initial esterification reaction chamber 11 is controlled at 245 ° C and the pressure is controlled at 80 kPa. When the conversion rate reaches 96%, the initial esterification reaction product is introduced into the final esterification reaction chamber 12 from the raw material conversion port 1b to carry out the final esterification reaction, and the temperature in the final esterification reaction chamber 12 is controlled at 235 ° C, and the pressure is controlled at 80kPa, when the esterification rate reached 98%, the final esterification reaction product was introduced from the raw material outlet 1c and the material inlet 2...

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Abstract

The invention discloses a polytrimethylene terephthalate and a production method thereof. The production method for the polytrimethylene terephthalate comprises the following steps: performing the esterification reaction, pre-polymerization and polycondensation on the terephthalic acid and 1,3-propylene glycol in sequence, wherein the esterification reaction comprises the initial esterification reaction and final esterification reaction, the pre-polymerization comprises the low temperature pre-polymerization and high temperature pre-polymerization, the final esterification reaction and the low temperature pre-polymerization belong to the plug flow reaction, and the reaction temperature of each of the final esterification reaction and the low temperature pre-polymerization is respectively lower than the reaction temperature of the initial esterification reaction for 1-10 DEG C, the reaction pressure of the low temperature pre-polymerization is lower than the reaction pressure of the final esterification reaction for 10-100kPa, and the reaction temperature of the low temperature pre-polymerization is lower than the reaction temperature of the high temperature pre-polymerization for 1-20 DEG C. The content of the by-product is effectively reduced and the color of the product is improved by adopting the method.

Description

technical field [0001] The invention relates to a method for producing polytrimethylene terephthalate and polytrimethylene terephthalate produced by the method. Background technique [0002] Polytrimethylene terephthalate (PTT) is polycondensed from terephthalic acid (PTA) or dimethyl terephthalate (DMT) and 1,3-propanediol (PDO). Chemical fiber materials and engineering plastic materials. [0003] Because the polycondensation process of PTT needs to be carried out at a relatively high temperature, in addition to the main reaction to generate PTT, there are also the following side reactions, and the generated by-products will seriously affect the reaction process and product quality: [0004] (1) etherification reaction: [0005] During polycondensation, PDO will form dipropylene glycol (DPG), and acidic PTA will aggravate the generation of DPG, and the copolymerization of DPG in the PTT molecular chain will reduce the melting point of the polymer, which is prone to breaka...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/78
Inventor 张怀立王钰
Owner ZHANGJIAGANG GLORY CHEM IND CO LTD