Circular Solutions/Recycling

Blend of dimethyl sulfoxide and 2-methyltetrahydrofuran as solvent for selective elastane dissolution from fabrics

Saal B
Mittwoch, 11.09.2024, 17:35 - 18:00 Uhr

Ambient atmospheric process for selective dissolution and recovery of elastane, without damage to other fibres. Solubility levels of elastane in solvent blends higher or comparable to dimethylformamide. Process suitability tested on elastane blends with polyester, polyamide and cellulose.

Sprecher
Lukas Vonbrül (Universität Innsbruck)
Typical solvents for elastane, dimethylformamide (DMF) and dimethylacetamide (DMAc) are toxic and not environment friendly, which makes it difficult to handle them in large quantities. The reported work focuses on the use of dimethyl sulfoxide (DMSO) and 2-methyltetrahydrofuran (2-MeTHF) blends for selective separation of elastane from clothing by dissolution. It can be demonstrated, that elastane can be selectively dissolved at room temperature in ambient atmosphere by mixing these two solvents at a specific ratio. The main solvent component, 2-MeTHF can be sourced from agriculture waste, which makes it very suitable for green chemistry protocols. The analytical results of the treated fabrics indicate successful elastane separation and no sign of degradation of other textile fibres. The 2-MeTHF can be distilled off at mild temperatures, leaving the elastane to precipitate in the DMSO. Separation of the precipitate allows for the recovery of the DMSO as well for later reuse. Investigations are ongoing on reuse of the recovered elastane e.g., by re-spinning.