Dissolution process for extracting pigments from recycled thermoplastic polyurethanes
Innovative process using tunable solvents and chemical agents to selectively extract organic and inorganic pigments from recycled thermoplastic polyurethanes without degrading their properties.
Overview
This innovative solution employs tunable sustainable solvents, such as ionic liquids and deep eutectic solvents, combined with chemical agents, to selectively extract organic and inorganic pigments from recycled thermoplastic polyurethanes (TPUs). The process ensures that the chemical structure and mechanical properties of TPUs remain intact. By using advanced techniques like ultrasounds and microwaves, the efficiency of pigment and dye removal is significantly enhanced, offering an environmentally friendly and effective method for recycling and repurposing TPUs.
Technical specifications
Key features:
- Utilizes tunable solvents which can be adapted for specific pigment extraction needs
- Incorporates ultrasounds and microwaves to boost solvent efficiency
- Capable of dissolving organic pigments and dyes while modifying inorganic pigments through redox processes
- Ensures that TPUs retain their original properties after pigment removal
- Uses FTIR-microscopy and NMR for monitoring contaminant removal
- Polyurethane properties tested pre and post-treatment using DSC, TGA, and a Universal testing machine
Technology readiness level
The current stage of development is at Technology Readiness Level 2. Initial experiments have been conducted to assess the resistance of commercial polyurethanes to solvent and chemical recycling. The next steps involve characterizing polyurethanes to exclude any solvents or chemicals that could cause degradation. Future plans include integrating and optimizing the process using Aspen+ simulation software.
About National Institute of Chemistry (Kemijski inštitut)
Slovenia’s National Institute of Chemistry (Kemijski inštitut) is a leading public research institute based in Ljubljana, bringing together multidisciplinary teams, advanced infrastructure, and close ties with universities to address industry‑relevant challenges. Industry partners engage through contract research, analytical services, collaborative projects, and access to shared facilities such as high‑field NMR, mass spectrometry, and advanced microscopy. Its location near established pharmaceutical and specialty‑chemical manufacturers in Slovenia and Central Europe supports agile partnering, talent pipelines, and rapid technology validation. Research is supported by competitive European Commission programs and national research funding. A dedicated technology transfer office manages IP, licensing, and spinout support, offering clear pathways from discovery to deployment.
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