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Solid phase polycondensation of polyester with process gas cleaning

A technology of process gas and solid-state polycondensation, applied in gas treatment, chemical/physical/physicochemical stationary reactors, chemical instruments and methods, etc.

Inactive Publication Date: 2007-07-25
POLYMETRIX AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the liquid phase condensation processing step and the solid phase condensation processing step and the solid phase polycondensation processing step have to be connected to each other

Method used

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  • Solid phase polycondensation of polyester with process gas cleaning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] The repelletized polyethylene terephthalate was supplied at an inlet temperature of 10 °C to the process according to Figure 1 consisting of equipment 1, 2, 3, 4, 5, 6, H, C1 and C2. The material passing capacity is 1 ton / hour. In crystallizer 1, the product was heated to 192°C, and the crystallinity increased by 35%. In Reactor 2, the intrinsic viscosity increased from 0.72 to 0.84. 9 t / h of nitrogen continuously heated to 202° C. was circulated in the circulation system of the crystallizer 1 . 0.6 t / h of purified nitrogen heated continuously to 50°C was supplied to reactor 2. Cooling takes place with 2.5 tons / hour of air. Nitrogen is purified by a 2-stage gas scrubber and adsorption dryer regenerated with heated process gas. 5 t / h or 1 t / h scrubbing liquid is circulated in the gas scrubber. Before crystallizer 1 , before reactor 2 and after reactor 2 each a gate (not shown) is used.

[0122] A total of 44 kWh of energy for the engine and 72 kWh for the heater ar...

Embodiment 2

[0125] In this example, the apparatus of Example 1 was extended to include a product delivery device between crystallizer 1 and reactor 2 . As a result, an additional 6 kWh is consumed for conveying energy and compensating heat losses through the conveying section, which corresponds to a total consumption of 122 kWh / ton.

Embodiment 3

[0127] In this example, the apparatus of Example 2 was operated in such a way as to heat the product in crystallizer 1 to 210° C., thereby increasing the intrinsic viscosity above 0.9. As a result, an additional 13 kWh is consumed for heating power, which corresponds to a total consumption of 135 kWh / ton.

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PUM

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Abstract

The invention relates to a method for producing a high-molecular polyester from a solidified polyester prepolymer by solid phase polycondensation. The polycondensation cleavage products of the solid phase polycondensation reaction are extracted from the product by means of a process gas, and the process gas is then cleaned and essentially recycled. According to the invention, the process gas is cleaned by means of an aqueous washing liquid. The invention also relates to an installation for carrying out the inventive method, said installation containing a crystallisation appliance (1) and a reaction appliance (2). A gas outlet (2d) of the reaction appliance (2) is directly or indirectly connected to a gas inlet (3c) in a gas cleaning system (3), and a gas outlet (3d) of the gas cleaning system (3) is connected to a gas inlet (2c) of the reaction appliance (2). Furthermore, the gas cleaning system (3) comprises a gas washing appliance to which an aqueous washing liquid is supplied, and a gas drying appliance (4) which is mounted downstream.

Description

technical field [0001] The invention relates to a process for the preparation of high molecular weight polyesters from solidified polyester prepolymers by solid-state polycondensation, wherein polycondensation dissociation products originating from the solid-phase polycondensation are removed from the product by means of a process gas, which is then purified Polycondensation dissociation products are removed and substantially recycled. [0002] The invention also relates to a plant for the preparation of high molecular weight polyesters having a crystallization device and a reaction device. Background technique [0003] The preparation of high molecular weight polycondensates by means of solid-state polycondensation steps is known in the prior art. [0004] Usually, the process gas is at least partially circulated here. Here, the process gas must be at least partially subjected to a purification process. Such a purification process is known, for example, from EP 1100611, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/00C08G63/80C08G63/78
CPCC08G63/785B01D53/1487B01D2257/70B01D2259/402B01J19/20B01J2219/00006B01J2219/00033B01J2219/00182C08G63/80B29B9/06B29B9/065B29B9/10B29B9/12B29B2009/165
Inventor A·克里斯特尔C·费雷拉
Owner POLYMETRIX AG