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Production of a high-molecular polycondensate

A high-molecular-weight, polycondensation technology, applied in the field of devices for preparing high-molecular-weight polycondensation, can solve problems such as increased process energy and long processing time

Active Publication Date: 2012-04-25
POLYMETRIX AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Another disadvantage is the long processing time, which causes an energy-intensive compression of the used process gas when the heating takes place in a residence time plant, or requires the use of multiple plants or plant stages for separate heating and processing
Also disadvantageous is the necessary low dew point in the subsequent crystallization stage, which leads to increased process energy

Method used

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  • Production of a high-molecular polycondensate
  • Production of a high-molecular polycondensate
  • Production of a high-molecular polycondensate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0129] The pelletized polyethylene terephthalate was supplied at an inlet temperature of 10 °C to the figure 1 In a process consisting of equipment 1, 2, 3, 4, 5, 6, H1, H2, H3, C1 and C2. The material passing capacity is 22.9 tons / hour.

[0130] The product was heated to 72° C. in heating unit 1 through which 90% of the air from the cooler was passed. In crystallization apparatus 2, the product was further heated to 186°C and the crystallinity increased to 38%.

[0131] In heating apparatus 3, the product was further heated in six stages to 213° C., and the crystallinity increased to 45%.

[0132] In the reaction apparatus or reactor 4, the intrinsic viscosity increases from 0.62 to 0.82.

[0133] In the circulation of the crystallization plant 2, 124 t / h of nitrogen are circulated, which is continuously heated to 200°C.

[0134] In the circulation of the heating device 3, 11 t / h of nitrogen was continuously circulated in six stages. This gives about 3:1 mg / mp. Nitroge...

Embodiment 2

[0143] In this comparative example, the plant as in Example 1 was operated without Plant 1 but with a gas purification system consisting of a catalytic combustion unit at 350° C. followed by an adsorption dryer. No gas scrubber is used, and no cooling air from plant 5 is used in the process.

[0144] A total of 43 kWh / t of energy for the engine and 83 kWh / t of energy for the heater are supplied to the process, which corresponds to a total consumption of 126 kWh / t.

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PUM

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Abstract

The invention relates to a method for producing a high-molecular polycondensate from a solidified polycondensate prepolymer by solid phase polycondensation. According to said method, 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 of the polycondensation cleavage products and essentially recycled. According to the invention, the specific energy input is less than 120kWh / t, preferably less than 110 kWh / t and especially between 70 and 100 kWh / t. The invention also relates to an installation for producing a high-molecular polycondensate, said installation comprising a heating appliance (1), followed by a crystallisation appliance (2), a reaction appliance (4), anda cooling appliance (5). A gas outlet (5d) of the cooling appliance (5) is connected to a gas inlet (1c) of the heating appliance (1), a gas outlet (4d) of the reaction appliance (4) is connected to a gas inlet (6c) in a gas cleaning system (6), and a gas outlet (6d) of the gas cleaning system (6) is connected to a gas inlet (4c) of the reaction appliance (4).

Description

technical field [0001] The present invention relates to a process for the preparation of high molecular weight polycondensates from solidified polycondensate prepolymers by solid phase polycondensation, wherein the polycondensation dissociation products resulting from the solid phase polycondensation reaction are removed from the product via a process gas, and the process gas is then purified To remove polycondensation dissociation products and essentially recycle them. [0002] The invention also relates to a plant for the preparation of high molecular weight polycondensates, which consists of at least one heating device, followed by at least one crystallization device, reaction device and cooling device, wherein at least the cooling device, reaction device and heating device each have a product inlet and a Product outlet, and gas inlet and gas outlet. Background technique [0003] The preparation of high molecular weight polycondensates by means of solid-state polycondens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/00C08G63/80C08G63/78
CPCC08G63/80C08G63/785
Inventor A·克里斯特尔C·费雷拉
Owner POLYMETRIX AG