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Chemical Recycling of a Textile Blend from Polyester and Viscose, Part II: Mechanism and Reactivity during Alkaline Hydrolysis of Textile Polyester
RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.ORCID iD: 0000-0002-2513-4289
RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.
Chalmers University of Technology, Sweden.
RISE Research Institutes of Sweden, Materials and Production, Polymeric Materials and Composites.ORCID iD: 0000-0002-6608-6842
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2022 (English)In: Sustainability, E-ISSN 2071-1050, Vol. 14, no 11, article id 6911Article in journal (Refereed) Published
Abstract [en]

Chemical recycling of textiles holds the potential to yield materials of equal quality and value as products from virgin feedstock. Selective depolymerization of textile polyester (PET) from regenerated cellulose/PET blends, by means of alkaline hydrolysis, renders the monomers of PET while cellulose remains in fiber form. Here, we present the mechanism and reactivity of textile PET during alkaline hydrolysis. Part I of this article series focuses on the cellulose part and a possible industrialization of such a process. The kinetics and reaction mechanism for alkaline hydrolysis of polyester packaging materials or virgin bulk polyester are well described in the scientific literature; however, information on depolymerization of PET from textiles is sparse. We find that the reaction rate of hydrolysis is not affected by disintegrating the fabric to increase its surface area. We ascribe this to the yarn structure, where texturing and a low density assures a high accessibility even without disintegration. The reaction, similar to bulk polyester, is shown to be surface specific and proceeds via endwise peeling. Finally, we show that the reaction product terephthalic acid is pure and obtained in high yields. © 2022 by the authors. 

Place, publisher, year, edition, pages
MDPI , 2022. Vol. 14, no 11, article id 6911
Keywords [en]
alkaline hydrolysis, depolymerization, peeling reaction, polyester, textile recycling, alkalinity, cellulose, hydrolysis, industrialization, reaction kinetics, reaction rate, recycling
National Category
Textile, Rubber and Polymeric Materials
Identifiers
URN: urn:nbn:se:ri:diva-59843DOI: 10.3390/su14116911Scopus ID: 2-s2.0-85132447583OAI: oai:DiVA.org:ri-59843DiVA, id: diva2:1685333
Note

Correspondence Address: Bengtsson, J.; RISE Research Institutes of Sweden, Argongatan 30, Sweden; email: jenny.bengtsson@ri.se; Correspondence Address: Jedvert, K.; RISE Research Institutes of Sweden, Argongatan 30, Sweden; email: kerstin.jedvert@ri.se; Funding details: Södra Skogsägarnas Stiftelse för Forskning, Utveckling och Utbildning, 2019-106; Funding text 1: Funding: This research was funded by Södra Skogsägarnas Stiftelse för Forskning, Utveckling och Utbildning, grant number 2019-106.

Available from: 2022-08-02 Created: 2022-08-02 Last updated: 2023-05-22Bibliographically approved

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Bengtsson, Jennyde la Motte, HannaJedvert, Kerstin

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