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
View PDF11 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, more process gas is required in the SSP-reactor to reac...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process and apparatus for direct crystallization of polymers under inert gas

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap