Efficient pigment removal from TPU using supercritical CO2
A novel method using supercritical carbon dioxide (scCO2) to remove pigments from thermoplastic polyurethane (TPU) without degrading its properties. This environmentally friendly process offers an alternative to traditional solvents, optimizing dye solubility and extraction efficiency.
Overview
This solution leverages supercritical carbon dioxide (scCO2) to efficiently remove pigments and dyes from thermoplastic polyurethane (TPU) without compromising the polymer's integrity. The process aims to provide an environmentally sustainable alternative to conventional solvent-based extraction methods, which often involve toxic chemicals and waste. By adjusting temperature and pressure, scCO2's solvating power is optimized to dissolve a wide range of dyes, minimizing environmental impact and reducing hazardous waste.
Technical specifications
- Environmentally friendly: Utilizes non-toxic scCO2, reducing the need for hazardous solvents.
- Adjustable Solubility: Temperature and pressure adjustments allow for tailored solubility of dyes, enhancing extraction efficiency.
- Mild operational conditions: Operates at approximately 31°C and 73 atm, preserving over 90% of TPU's mechanical properties.
- Recyclable CO2: The CO2 used in the process can be recycled by precipitating the colorant at reduced pressure, further minimizing waste.
Technology readiness level
This technology is currently at TRL 3, indicating that it has been validated in a laboratory setting with ongoing research to optimize the process parameters and evaluate its environmental impact further.
About University of Massachusetts Lowell
UMass Lowell is a comprehensive public research university in the University of Massachusetts system, known for hands-on, industry-aligned education. Industry partners engage through open-access core research facilities and pilot-scale labs for prototyping and scale-up, supported by staff for contract services. A robust co-op program connects companies with student and faculty talent, while incubator and coworking sites near campus offer labs and flexible space. Research is supported by competitive federal funding from agencies such as the National Science Foundation, National Institutes of Health, Department of Energy, and Department of Defense. A dedicated technology transfer office supports IP, licensing, sponsored research, and startup formation to streamline commercialization.
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