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Method and apparatus for crystallizing polymer particles

A technology of polymer particles and polymers, applied in the field of extrusion, cutting and crystallization of polymer particles in liquid media, which can solve the problems of solid flow interruption, uneven gas distribution, aggregation or sintering

Inactive Publication Date: 2015-09-23
UOP LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Continuing this crystallization process in the SSP reactor leads to problems with exotherm and particle agglomeration or sintering, causing maldistribution of gas and interruption of solids flow

Method used

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  • Method and apparatus for crystallizing polymer particles

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Embodiment Construction

[0020] If the polymer must be cooled after it has been formed into the desired shape, the invention can be used to form molten polymer into pellets. The polymers of the present invention are preferably crystallizable thermoplastic polymers. Polyester polymers are particularly suitable for use in the present invention, preferably PET polymers. Copolymers of PET and polyester are also suitable.

[0021]The present invention will be described with reference to the accompanying drawings. The invention comprises a granulation and quenching system 2 served by a cooled liquid, a crystallization section 4 served by a warmed liquid, and an SSP reactor system 6 . The pelletizing and quenching system 2 includes a molding unit 10 that receives polymeric resin from a line 12 . The resin in line 12 has either already melted, or the molding apparatus 10 has heated it above the melting temperature to bring the polymer into a molten state. The molten polymer can be pelletized using any of ...

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Abstract

The present invention is a process and apparatus for conserving loss of heat while forming and crystallizing polymer particles in a liquid. The cooling liquid quenches the polymer during particle molding to facilitate shaping. The cooling liquid cools the polymer particles not below a temperature that allows adequate crystallization to occur. Cooling liquid is quickly switched with a warming liquid, so the temperature of the polymer is in the crystallization range and the heat of crystallization self-heats the polymer to a higher temperature.

Description

Background of the invention [0001] The present invention relates to the formation and crystallization of low molecular weight polymer particles. More particularly, the present invention relates to methods and apparatus for extruding, cutting and crystallizing polymer particles in a liquid medium. [0002] Polymeric resins are molded into a variety of useful products. Useful polymeric resins include aromatic polyesters, polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), polyethylene naphthalate Propylene formate (PTN), polycyclohexyl terephthalate (PCT) and polyethylene naphthalate (PEN) are examples thereof. Polyester resins, especially PET, copolymers of terephthalic acid with a smaller proportion of isophthalic acid and PBT are used in the production of beverage containers, films, fibers, packaging and tire cords. [0003] Polyester resins are prepared in the melt phase polymerization (MPP) process and have low molecu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B9/00
CPCB29B9/065B29B2009/165B29K2995/0041B29B9/16
Inventor J·F·麦吉
Owner UOP LLC
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