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Title: Application of Raman spectroscopy to identification and sorting of post-consumer plastics for recycling

Abstract

A high accuracy rapid system for sorting a plurality of waste products by polymer type. The invention involves the application of Raman spectroscopy and complex identification techniques to identify and sort post-consumer plastics for recycling. The invention reads information unique to the molecular structure of the materials to be sorted to identify their chemical compositions and uses rapid high volume sorting techniques to sort them into product streams at commercially viable throughput rates. The system employs a laser diode (20) for irradiating the material sample (10), a spectrograph (50) is used to determine the Raman spectrum of the material sample (10) and a microprocessor based controller (70) is employed to identify the polymer type of the material sample (10).

Inventors:
;
Issue Date:
Research Org.:
National Recovery Technologies, Inc., Nashville, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
874105
Patent Number(s):
6313423
Application Number:
09/284,955
Assignee:
National Recovery Technologies, Inc. (Nashville, TN)
Patent Classifications (CPCs):
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02W - CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
B - PERFORMING OPERATIONS B29 - WORKING OF PLASTICS B29B - PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED
DOE Contract Number:  
FG02-95ER82038
Resource Type:
Patent
Resource Relation:
Patent File Date: 1999 Jul 14
Country of Publication:
United States
Language:
English
Subject:
application; raman; spectroscopy; identification; sorting; post-consumer; plastics; recycling; accuracy; rapid; plurality; waste; products; polymer; type; involves; complex; techniques; identify; sort; reads; information; unique; molecular; structure; materials; sorted; chemical; compositions; volume; product; streams; commercially; viable; throughput; rates; employs; laser; diode; 20; irradiating; material; sample; 10; spectrograph; 50; determine; spectrum; microprocessor; based; controller; 70; employed; laser diode; product stream; raman spectroscopy; waste product; /209/356/

Citation Formats

Sommer, Edward J., and Rich, John T. Application of Raman spectroscopy to identification and sorting of post-consumer plastics for recycling. United States: N. p., 2001. Web.
Sommer, Edward J., & Rich, John T. Application of Raman spectroscopy to identification and sorting of post-consumer plastics for recycling. United States.
Sommer, Edward J., and Rich, John T. Mon . "Application of Raman spectroscopy to identification and sorting of post-consumer plastics for recycling". United States. https://www.osti.gov/servlets/purl/874105.
@article{osti_874105,
title = {Application of Raman spectroscopy to identification and sorting of post-consumer plastics for recycling},
author = {Sommer, Edward J. and Rich, John T.},
abstractNote = {A high accuracy rapid system for sorting a plurality of waste products by polymer type. The invention involves the application of Raman spectroscopy and complex identification techniques to identify and sort post-consumer plastics for recycling. The invention reads information unique to the molecular structure of the materials to be sorted to identify their chemical compositions and uses rapid high volume sorting techniques to sort them into product streams at commercially viable throughput rates. The system employs a laser diode (20) for irradiating the material sample (10), a spectrograph (50) is used to determine the Raman spectrum of the material sample (10) and a microprocessor based controller (70) is employed to identify the polymer type of the material sample (10).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {1}
}