Polyester production equipment and technology

A production device and production process technology, applied in the field of differential thermoplastic polyester preparation, can solve the problems of high content of terminal carboxyl groups and high processing cost, reduce the content of terminal carboxyl groups, improve production capacity, and facilitate the improvement of reaction efficiency and synthesis rate Effect

Active Publication Date: 2015-03-11
ZHEJIANG GUXIANDAO POLYESTER DOPE DYED YARN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome defects such as high terminal carboxyl group content and high processing cost in the existing poly

Method used

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  • Polyester production equipment and technology
  • Polyester production equipment and technology
  • Polyester production equipment and technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The polyester production device of the present embodiment comprises a still of esterification, a second still of esterification, a still of polycondensation, a second still of polycondensation and a final polycondensation still, wherein:

[0035] to combine figure 2 , the first esterification kettle is a fully mixed reaction kettle, including a kettle body 1, a sleeve 2 and a heat medium coil 3, the height of the kettle body 1 is 5.6m, and a cylindrical sleeve is arranged inside the kettle body 1 One 2, the sleeve one 2 is 1.65m high and 1.25m in diameter, the sleeve one 2 is welded on the bottom of the kettle body one 1 by three legs; the thermal coal casing one 3 is arranged on the kettle body one 1 and the sleeve one Between 2, there are 15 layers from bottom to top, the layer spacing is 10cm, each layer is wound eight times, and the interval between each circle is 10cm; the kettle body-1 is provided with a stirrer-4, and the lower end of the stirrer-4 is located ...

Embodiment 2

[0047] The polyester production device of the present embodiment is identical with embodiment 1, but its production process is specifically as follows:

[0048] (1) Slurry preparation: put purified terephthalic acid and ethylene glycol into the slurry kettle at a molar ratio of 1:1.2, and then add 190ppm catalyst ethylene glycol antimony for beating.

[0049] (2) Esterification: Esterification is divided into two stages of one-stage esterification and two-stage esterification. The first-stage esterification and the second-stage esterification are carried out in the first esterification kettle and the second esterification kettle respectively. The reaction temperature is about 92%, the reaction temperature is 256°C, the pressure is about 45KPa, and the reaction time is 5.5 hours; the esterification rate of the second-stage esterification is about 98%, the reaction temperature is 266°C, the pressure is about 12KPa, and the reaction time is 1.5 hours.

[0050] (3) Polycondensatio...

Embodiment 3

[0053] The polyester production device of the present embodiment is identical with embodiment 1, but its production process is specifically as follows:

[0054](1) Slurry preparation: put purified terephthalic acid and ethylene glycol into the slurry kettle at a molar ratio of 1:1.2, and then add 190ppm catalyst ethylene glycol antimony for beating.

[0055] (2) Esterification: Esterification is divided into two stages of one-stage esterification and two-stage esterification. The first-stage esterification and the second-stage esterification are carried out in the first esterification kettle and the second esterification kettle respectively. The reaction temperature is about 92%, the reaction temperature is 256°C, the pressure is about 50KPa, and the reaction time is 5 hours; the esterification rate of the second-stage esterification is about 98%, the reaction temperature is 267°C, the pressure is about 12KPa, and the reaction time is 1.5 hours.

[0056] (3) Polycondensation r...

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Abstract

The invention relates to polyester production equipment and a polyester production technology, and belongs to the technical field of differentiated preparation of thermoplastic polyester. The polyester production technology comprises the steps of burdening, esterifying and condensation polymerization, adding terephthalic acid and ethanediol to a reaction kettle according to a molar ratio of 1: (1.15-1.5), firstly performing an esterification reaction which comprises first-stage esterification and second-stage esterification, wherein the esterification rate of the first-stage esterification is controlled to be 90-92%, and the esterification rate of the second-stage esterification is up to 96-99%, shifting to condensation polymerization, performing grain-sized dicing on the melt after condensation polymerization, so as to form the finished product. The sliced polyester finished product is excellent in ageing resistance, moisture transmission resistance, weather resistance and the like, and has a good application prospect in the field of the solar backing plate polyester film market.

Description

technical field [0001] The invention relates to a polyester production device and a polyester production process using the device, belonging to the technical field of differential thermoplastic polyester preparation. Background technique [0002] Polyester has high intrinsic viscosity, low acetaldehyde content, good crystallinity, heat resistance, weather resistance and dimensional stability, and can be made into different forms such as fibers, plastics, films, etc. It has a wide range of uses in the field of food packaging. [0003] The currently commonly used technology for PET polyester is a high molecular polymer formed by polycondensation reaction under the action of a catalyst after the esterification reaction of PTA (terephthalic acid) and EG (ethylene glycol), and the growth of molecular chains. Since the unreacted terminal carboxyl group in the PET molecule is "naked", the polar group -COOH becomes an "unstable factor" in the PET molecule. Studies have shown that ...

Claims

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Application Information

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IPC IPC(8): C08G63/183C08G63/78
Inventor 刘雄金革石教学贾少华
Owner ZHEJIANG GUXIANDAO POLYESTER DOPE DYED YARN CO LTD
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