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Method for cleaning and decontaminating polyesters

A technology of polyester and polyethylene terephthalate, applied in the direction of products, educts, reagents, etc., can solve the problems of increasing basic costs

Inactive Publication Date: 2001-11-07
UNITED RESOURCE RECOVERY CORPORATON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this adds to the base cost of the overall process, since the polyester must be regenerated at the end

Method used

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  • Method for cleaning and decontaminating polyesters

Examples

Experimental program
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Effect test

Embodiment

[0071] 3,000 lbs of PVC-contaminated post-consumer PET bottles were ground into 3 / 8" nominal size flakes and added to a sinking tank to remove paper and polyolefin. The heavy fraction containing ground PET and PVC was mixed with 10% by weight of 50% sodium hydroxide solution was mixed and then fed into an electrically heated batch rotary kiln with a diameter of 54" and a heating length of 32'. The material was heated to 250°F while maintaining 600 cubic ft. / min of hot dry air purging the kiln (-80°F dew point, and 250°F temperature).

[0072] After 3 hours, the moisture content of the flakes was 0.2%, at which point the temperature of the flakes and air was raised to 400°F and held at that temperature for 9 hours.

[0073] The material is then cooled and added to a sink to remove degraded PVC. After sinking, the heavy fraction was washed with a REG MAC high shear washer for 2 minutes, followed by a rinse with a pH-4 phosphoric acid solution. After the acid rinse, the materia...

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Abstract

A method for treating polyesters comprises combining discrete particles of a polyester with an alkaline composition such that the alkaline composition coats the polyester particles. The particles are then heated in an environment that is at least substantially free of water. The method can be effectively used in cleaning, decontaminating and even increasing the intrinsic viscosity of polyester materials. Moreover, when used in the recovery of polyester materials containing contaminants and / or impurities, the method can provide a superior polyester product both in terms of intrinsic viscosity and color.

Description

field of invention [0001] The present invention relates to a process for treating polyesters. In particular, the present invention relates to techniques that can be effectively used to clean, decontaminate, and even improve the intrinsic viscosity of polyesters. Thus, the technology can be used in various processes, including separation of materials such as waste from polyester and solidification of polyester containing impurities and / or contaminants. Background of the invention [0002] Polyester is a polymer that can be prepared by esterification of polybasic organic acids with polyhydric alcohols. Probably the most commonly prepared and used polyester is polyethylene terephthalate (PET), which is prepared by reacting terephthalic acid with ethylene glycol. [0003] At present, the amount of polyester used in various applications is increasing day by day. For example, polyesters are commonly used in the manufacture of all types of containers such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29B17/04C08J11/06C08J11/16
CPCC08J11/16C08J2367/02C08J11/04Y02P20/143Y02W30/62C08J11/06
Inventor J·A·小施瓦兹
Owner UNITED RESOURCE RECOVERY CORPORATON
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