A method for the solid state polymerization of polyethylene terephthalate

A solid-phase polymerization, turbine technology, applied in chemical instruments and methods, mixers, mixers with rotary stirring devices, etc. Effect

Active Publication Date: 2009-12-30
VOMM IMPIANTI E PROCESSI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] The method according to EP0856537, although faster than known methods, has the disadvantage of discontinuous operation, since it always uses a furnace or similar

Method used

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  • A method for the solid state polymerization of polyethylene terephthalate

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Embodiment Construction

[0027] Referring to the drawings, the apparatus for solid-phase polymerization of PET includes a turbo heater T.

[0028] A turbo heater T (manufactured for example by the company VOMM Impianti e Processi of Rozzano (I-Milano)) essentially consists of a cylindrical tubular body 1 closed at its opposite ends by end plates 2, 3 and equipped with coaxial A heating jacket 4 through which a fluid such as thermally transparent oil will flow.

[0029] The tubular body 1 has an inlet 5 for flake or powdered PET material and an outlet 6 for product that has been subjected to solid state polymerization.

[0030] In the tubular body 1, a bladed rotor 7 is rotatably supported. The blades 8 of the rotor are helically arranged and oriented so as to create a centrifugal action while advancing the processed product towards the outlet. The motor M rotates the rotor 7 at a speed of 200 to 1500 rpm, preferably at a speed of 400-600 rpm.

[0031] For possible technical reasons, it is clear tha...

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Abstract

A method for the solid state polymerization of PET, which comprises the steps of subjecting finely divided PET material, having an intrinsic viscosity comprised between 0,60 and 0,80 dl / g to heating in an inert atmosphere while it flows in the form of a thin, turbulent, dynamic layer in contact -with a wall heated to at least 200 DEG C, obtaining a PET material with an average intrinsic viscosity higher or equal to 0,85 dl / g; advantageously, the above method is carried out with the aid of a turbo-heater (T) comprising a cylindrical tubular body (1) equipped with a heating jacket (4), with inlet and outlet openings (5, 6) and with a bladed rotor (7) rotatably supported thereinside.

Description

technical field [0001] The present invention relates generally to a process for the solid phase polymerization of polyethylene terephthalate (PET), especially solid phase PET from separately collected solid waste such as empty mineral water and beverage bottles, etc. Aggregation method. [0002] In particular, the present invention relates to a PET with high variability, low intrinsic viscosity (such as PET from bottles etc. obtained from fragments collected separately) with high intrinsic viscosity and thus suitable for use in subsequent extrusion and The PET method in the molding process. Background technique [0003] Currently, empty bottles and other products made from re-recycled PET from solid waste collected separately undergo washing, cutting and grinding operations to obtain more or less fine flakes or powder products, which are then added in low percentages to the initial in pure PET in the mix to make bottles by the traditional extrusion method. However, throug...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/80C08G63/78B01F7/04B01F15/06B01J19/18C08G63/183
CPCC08G63/80C08G63/183B01J19/1806B01F15/065B01J2219/00094C08G63/785B01J2219/182B01F7/04B01F2015/062B01F27/70B01F35/92B01F2035/99
Inventor 朱塞平娜·切雷亚
Owner VOMM IMPIANTI E PROCESSI
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