Processing of leather using deep eutectic solvents

Andrew P Abbott, Alaysuy Omaymah, A Paula M Antunes, Andrew C Douglas, Jeffry Guthrie-Strachan, William R Wise

Research output: Contribution to journalArticle

Abstract

Processing of leather has an historical reputation as a chemically and energetically intensive process that produces large volumes of aqueous waste. Saline pollution combined with heavy-metal, dyes and acid and base streams make leather production an ecologically sensitive industry. The current study shows that a variety of deep eutectic solvents (DESs) may be used for the tanning, fatliquoring and dyeing of animal hides, being particularly useful for mineral (chromium) and vegetable tanning processes. The tanning agents are able to penetrate rapidly into the hide, driven by lyotropic swelling due to their high ionic strength. The samples are shown to have similar tanning agent content to the currently used aqueous chromium(III) sulfate solution; however, the waste metal content is shown to be significantly reduced. Incorporation of the DES Ethaline into the leather significantly alters the swelling properties of the leather increasing the flexibility and ductility of the material, therefore acting in the same manner as a fatliquor that lubricates or plasticizes the fibrous structure of the collagen. Ethaline was also used to transport a lysochromic dye throughout the cross section of the leather, and the hydrophobicity of the dye prevents leaching into the aqueous wash solution. Physical measurements show that leather processed using DESs have similar mechanical properties to that processed using conventional aqueous systems.
Original languageEnglish
Article number6
Pages (from-to)1241–1247
Number of pages7
JournalACS Sustainable Chemistry and Engineering
Volume3
Issue number6
Early online date20 Apr 2015
DOIs
Publication statusPublished - 1 Jun 2015

Fingerprint

Leather
Eutectics
Tanning
Processing
Coloring Agents
Chromium
Swelling
Vegetables
Hydrophobicity
Heavy Metals
Ionic strength
Dyeing
Leaching
Sulfates
Minerals
Ductility
Animals
Pollution
Collagen
Metals

Keywords

  • Deep eutectic solvent
  • leather
  • collagen
  • tanning
  • fatliquoring
  • dyeing

Cite this

Abbott, A. P., Omaymah, A., Antunes, A. P. M., Douglas, A. C., Guthrie-Strachan, J., & Wise, W. R. (2015). Processing of leather using deep eutectic solvents. ACS Sustainable Chemistry and Engineering, 3(6), 1241–1247. [6]. https://doi.org/10.1021/acssuschemeng.5b00226
Abbott, Andrew P ; Omaymah, Alaysuy ; Antunes, A Paula M ; Douglas, Andrew C ; Guthrie-Strachan, Jeffry ; Wise, William R. / Processing of leather using deep eutectic solvents. In: ACS Sustainable Chemistry and Engineering. 2015 ; Vol. 3, No. 6. pp. 1241–1247.
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Abbott, AP, Omaymah, A, Antunes, APM, Douglas, AC, Guthrie-Strachan, J & Wise, WR 2015, 'Processing of leather using deep eutectic solvents', ACS Sustainable Chemistry and Engineering, vol. 3, no. 6, 6, pp. 1241–1247. https://doi.org/10.1021/acssuschemeng.5b00226

Processing of leather using deep eutectic solvents. / Abbott, Andrew P; Omaymah, Alaysuy; Antunes, A Paula M; Douglas, Andrew C; Guthrie-Strachan, Jeffry; Wise, William R.

In: ACS Sustainable Chemistry and Engineering, Vol. 3, No. 6, 6, 01.06.2015, p. 1241–1247.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Processing of leather using deep eutectic solvents

AU - Abbott, Andrew P

AU - Omaymah, Alaysuy

AU - Antunes, A Paula M

AU - Douglas, Andrew C

AU - Guthrie-Strachan, Jeffry

AU - Wise, William R

PY - 2015/6/1

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AB - Processing of leather has an historical reputation as a chemically and energetically intensive process that produces large volumes of aqueous waste. Saline pollution combined with heavy-metal, dyes and acid and base streams make leather production an ecologically sensitive industry. The current study shows that a variety of deep eutectic solvents (DESs) may be used for the tanning, fatliquoring and dyeing of animal hides, being particularly useful for mineral (chromium) and vegetable tanning processes. The tanning agents are able to penetrate rapidly into the hide, driven by lyotropic swelling due to their high ionic strength. The samples are shown to have similar tanning agent content to the currently used aqueous chromium(III) sulfate solution; however, the waste metal content is shown to be significantly reduced. Incorporation of the DES Ethaline into the leather significantly alters the swelling properties of the leather increasing the flexibility and ductility of the material, therefore acting in the same manner as a fatliquor that lubricates or plasticizes the fibrous structure of the collagen. Ethaline was also used to transport a lysochromic dye throughout the cross section of the leather, and the hydrophobicity of the dye prevents leaching into the aqueous wash solution. Physical measurements show that leather processed using DESs have similar mechanical properties to that processed using conventional aqueous systems.

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SN - 2168-0485

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Abbott AP, Omaymah A, Antunes APM, Douglas AC, Guthrie-Strachan J, Wise WR. Processing of leather using deep eutectic solvents. ACS Sustainable Chemistry and Engineering. 2015 Jun 1;3(6):1241–1247. 6. https://doi.org/10.1021/acssuschemeng.5b00226