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  4. Removal of inorganic colour pigments from acrylonitrile butadiene styrene by dissolution-based recycling
 
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2012
Journal Article
Title

Removal of inorganic colour pigments from acrylonitrile butadiene styrene by dissolution-based recycling

Abstract
Reinserting thermoplastic industrial scrap materials back into the production process must be feasible and cost-effective. Unfortunately, many thermoplastic materials contain colour pigments that cause undesired colour effects and, therefore, have to be removed before recycling. The purpose of this study was to reduce the inorganic colour pigments titanium dioxide, chromium(III) oxide and iron(III) oxide from acrylonitrile butadiene styrene. Based on experiences with dissolution-based polymer recycling, the two methods for removing these colour pigments studied in this project were filtration and centrifugation. Multiple laboratory-scale experiments were performed with two solvent formulations, acetone and CreaSolv® SB. Using the filtration method, both solvent formulations achieved reduction rates of 80% for titanium and iron and 90% for chromium. While similar reduction rates were obtained with high-speed laboratory-type centrifuges for acetone solutions, the results for CreaSolv® SB solutions were considerably lower under the same experimental conditions. Increasing the temperature or centrifugation speed, however, will also increase the reduction rates. Thereby, CreaSolv® SB solutions become suitable for industrial-scale processes. This is important because industrial processes based on CreaSolv® SB solutions are significantly safer than acetone-based processes.
Author(s)
Arends, Dagmar  
Fraunhofer-Institut für Verfahrenstechnik und Verpackung IVV  
Schlummer, Martin  
Fraunhofer-Institut für Verfahrenstechnik und Verpackung IVV  
Mäurer, Andreas  
Fraunhofer-Institut für Verfahrenstechnik und Verpackung IVV  
Journal
Journal of material cycles and waste management  
DOI
10.1007/s10163-012-0041-5
Language
English
Fraunhofer-Institut für Verfahrenstechnik und Verpackung IVV  
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