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Method and apparatus for direct crystallization of polycondensates

A technology of polycondensation and crystallization, applied in the direction of coating, etc., can solve problems such as economic disadvantages

Active Publication Date: 2022-03-29
POLYMETRIX AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, more process gas is required in the SSP reactor to reach the desired reaction temperature and this is economically disadvantageous

Method used

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  • Method and apparatus for direct crystallization of polycondensates
  • Method and apparatus for direct crystallization of polycondensates
  • Method and apparatus for direct crystallization of polycondensates

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Embodiment Construction

[0159] according to figure 1 The plant has a reactor 1 for producing a polymer melt. This may be a reactor in which the melt polymerisation is carried out to thereby produce a prepolymer from the monomers. Alternatively, reactor 1 may also be a device for melting solid products, such as prepolymers. Reactor 1 can in this case be, for example, an extruder.

[0160] The molten material is transferred to the granulation unit 2 . In the pelletizing device 2 pellet material is produced in a known manner from the molten material. This may involve, for example, underwater pellet mills (eg figure 1 shown in ) or an underwater strand pelletizer. In this case, granulation is carried out underwater. The pellets obtained are cooled in the granulator 2 at the same time. However, as noted, the cooling must not be so severe as to cool the pellets below their crystallization temperature range. This can be achieved by using temperatures above 50°C but at least 10°C below their pressure...

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Abstract

The invention relates to a method for the continuous production of partially crystallized polycondensate pellet material, said method comprising the steps of forming a pellet material from a polycondensate melt; mixing a liquid cooling medium with the pellets in a first process space Material separation, where after leaving the first processing space, the pellets exhibit a temperature T GR , and the pellet material is crystallized in a second process space in which fluidized bed conditions exist and the pellets are heated by externally supplying energy by means of a process gas.

Description

technical field [0001] The present invention relates to a method and an apparatus for the direct crystallization of polycondensates, especially polyesters, such as polyethylene terephthalate (PET). Background technique [0002] The production of certain high molecular weight polymers, especially polycondensates such as polyesters, by melt polycondensation is often not possible because of the excessive thermal stress associated therewith resulting in product degradation and unacceptable contamination by by-products. Therefore, prepolymers with relatively low molecular weights are produced by melt polycondensation. These prepolymers are then increased to the desired molecular weight in solid state polymerization (SSP). This procedure is known from the prior art (eg Scheirs / Long (eds.), Modern Polyesters, Wiley 2003, Chapter 4, pp. 143ff.). [0003] The prepolymer obtained by melt polycondensation is processed into pellet material for SSP reaction. To avoid aggregation of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B9/10B29B9/16C08G63/183C08G63/90
CPCC08G63/183C08G63/90B29B9/10B29B9/16B29B2009/165B29B9/065B29B7/748B29B7/007B29B7/88B29B9/12
Inventor A·克里斯特尔B·A·卡伯特
Owner POLYMETRIX AG