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Crystallization‐Based Separation of ε‐Caprolactam from a Depolymerization Reaction Mixture – Fundamentals and Potential Separation Strategies
Depolymerization and subsequent capture of monomers is of interest for process efficiency and sustainability. Polyamide‐6 (PA‐6) can be depolymerized in aqueous solution using a homogeneous catalyst. To purify the ε‐caprolactam (CPL) monomer and recycle the catalyst, two potential crystallization‐based strategies are studied: direct crystallization from the reaction mixture and liquid‐liquid extraction prior to crystallization. Solubilities in water and promising organic solvents were measured and compared to predictions using perturbed‐chain statistical associating fluid theory (PC‐SAFT) or conductor‐like screening model for real solvents (COSMO‐RS). Detailed solid‐liquid equilibria (SLE) of the CPL/water system were investigated utilizing DSC and PXRD. This work provides an overview of important factors of PA‐6 depolymerization including recycling of tungstophosphoric acid (TPA) and purification of CPL monomers. A first conceptual process design to be further developed is derived.
Crystallization‐Based Separation of ε‐Caprolactam from a Depolymerization Reaction Mixture – Fundamentals and Potential Separation Strategies
Depolymerization and subsequent capture of monomers is of interest for process efficiency and sustainability. Polyamide‐6 (PA‐6) can be depolymerized in aqueous solution using a homogeneous catalyst. To purify the ε‐caprolactam (CPL) monomer and recycle the catalyst, two potential crystallization‐based strategies are studied: direct crystallization from the reaction mixture and liquid‐liquid extraction prior to crystallization. Solubilities in water and promising organic solvents were measured and compared to predictions using perturbed‐chain statistical associating fluid theory (PC‐SAFT) or conductor‐like screening model for real solvents (COSMO‐RS). Detailed solid‐liquid equilibria (SLE) of the CPL/water system were investigated utilizing DSC and PXRD. This work provides an overview of important factors of PA‐6 depolymerization including recycling of tungstophosphoric acid (TPA) and purification of CPL monomers. A first conceptual process design to be further developed is derived.
Crystallization‐Based Separation of ε‐Caprolactam from a Depolymerization Reaction Mixture – Fundamentals and Potential Separation Strategies
Schultheis, Axel (author) / Tenberg, Vico (author) / Rihko‐Struckmann, Liisa (author) / Sundmacher, Kai (author) / Lorenz, Heike (author)
Chemie Ingenieur Technik ; 96 ; 1620-1631
2024-12-01
12 pages
Article (Journal)
Electronic Resource
English