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Issue 87, 2014
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Chemical recycling of waste poly(ethylene terephthalate) fibers into azo disperse dyestuffs

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Abstract

In this study, waste poly(ethylene terephthalate) (PET) fibers were chemically recycled into azo disperse dyestuffs. First, waste PET fibers were glycolytically degraded by excess ethylene glycol utilizing zinc acetate dehydrate as a catalyst. The glycolysis product, bis(2-hydroxyethyl) terephthalate (BHET), was purified through recrystallization and hydrolyzed into terephthalic acid (TPA). Thereafter, BHET and TPA were nitrated, reduced and azotized to obtain diazonium salts. Finally, the obtained diazonium salts were coupled with N,N-dimethylaniline to obtain azo disperse dyestuffs (dye A and dye B, respectively). The depolymerized products (BHET and TPA) and azo disperse dyestuffs (dyes A and B) were characterized by FTIR and 1H NMR spectroscopy. Nylon and polyester filaments were dyed with the synthesized azo dyestuffs with the dye bath pH ranging from 3.6 to 5.8. The performances of the dyestuffs were described by maximum absorption wavelength, K/S, L*, a* and b* values.

Graphical abstract: Chemical recycling of waste poly(ethylene terephthalate) fibers into azo disperse dyestuffs

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Publication details

The article was received on 25 Jul 2014, accepted on 04 Sep 2014 and first published on 05 Sep 2014


Article type: Paper
DOI: 10.1039/C4RA07608G
Citation: RSC Adv., 2014,4, 46476-46480
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    Chemical recycling of waste poly(ethylene terephthalate) fibers into azo disperse dyestuffs

    M. Li, Y. Huang, T. Yu, S. Chen, A. Ju and M. Ge, RSC Adv., 2014, 4, 46476
    DOI: 10.1039/C4RA07608G

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