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Process and apparatus for direct crystallization of polymers under inert gas

A technology of inert gas and polymer, applied to the method of using atmospheric pressure to chemically change substances, the method of granulating raw materials, chemical instruments and methods, etc., which can solve economic disadvantages and other problems

Active Publication Date: 2014-03-26
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, which is economically disadvantageous

Method used

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  • Process and apparatus for direct crystallization of polymers under inert gas

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Embodiment 1

[0095] figure 1 The plant has a reactor 1 for preparing a polymer melt. Here, it is a reactor in which the melt polymerization takes place and thus prepolymers are produced from monomers. Alternatively, reactor 1 may also be a device for melting solid products such as prepolymers. In this case, the reactor 1 may be, for example, an extruder.

[0096] The molten material is transferred to the granulation unit 2 . Pellets are produced from the molten material in a known manner in a granulator 2 . For example, the granulator can be an underwater granulator (such as figure 1 shown) or can be an underwater strand granulator. In this case, the granulation takes place under water. The resulting granulated granules are simultaneously cooled in the granulator 2 . But as previously mentioned, the cooling does not allow such a strong drop that the granulated particles cool below their glass transition point (ie below the viscosity temperature). This can be achieved by using heate...

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Abstract

An apparatus for continuous pelletization and crystallization of a polymer includes a unit for forming a polymer pellet material and cooling the pellet material in a liquid cooling medium. An after-connected drying unit has an exit opening for exporting gas and preferably selecting air and a crystallizer for crystallizing the pellet material. The crystallizer communicates via a connection line (5) with a pre-connected unit for separating the liquid cooling medium from the pellet material and drying the pellet material. The crystallizer (6) communicates with an inert gas tank via an inlet (6a), whereby the pressure in the crystallizer can be increased relative to the pressure in the drying unit (4). In addition, A related process for continuously preparing the partially crystallized polymer particles is also disclosed.

Description

technical field [0001] The present invention relates to a method and apparatus for the direct crystallization of polymers, in particular polyesters such as polyethylene terephthalate (PET), under inert gas. Background technique [0002] The preparation of certain high molecular weight polymers, especially polycondensates such as polyesters, is not possible by melt polycondensation because the resulting excessive heat load would cause product decomposition and unacceptable by-product contamination. For this reason, prepolymers with lower molecular weights are prepared by melt polycondensation. The prepolymer is then raised to the desired molecular weight in a solid-phase postcondensation (SSP). This process procedure is known in the prior art (eg Scheirs / Long (eds.), Modern Polyesters, Wiley 2003, Chapter 4, p. 143ff.). [0003] For the SSP reaction, the prepolymers obtained from the melt polycondensation are processed into pellets. To prevent binding of the pellets under ...

Claims

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Application Information

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IPC IPC(8): B29B9/00B29B9/16
CPCC08G63/88B29B9/16B01J2/00B29B9/12B29B9/10C08J3/124B29B9/065B29B9/06B29B9/14B29B2009/165C08G63/183B01J3/00B29B2009/168
Inventor A·克里斯特尔B·A·卡伯特F·尢西比奥
Owner POLYMETRIX AG
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