Abstract
ε-caprolactam is a monomer of high value. Therefore, the chemical reutilization of polyamide 6 containing carpets for ε-caprolactam recovery offers some economic benefit and is performed on a technical scale with the help of the Zimmer-process. By this process polyamide 6 is depolymerized with steam and phosphoric acid. An alternative to this process is the thermal depolymerization - catalyzed or non-catalyzed. To investigate this alternative in more detail, the formal kinetic parameters of (i) the thermal depolymerization of polyamide 6, (ii) the thermal depolymerization in presence of sodium/potassium hydoxide, and (iii) the thermal depolymerization in presence of phosphoric acid are determined in this work. Based on the kinetics of the catalyzed or non-catalyzed depolymerization a stepwise pyrolysis procedure is designed by which the formation of ε-caprolactam from polyamide 6 can be separated from the formation of other pyrolysis products.
| Original language | English |
|---|---|
| Pages (from-to) | 79-94 |
| Number of pages | 16 |
| Journal | Journal of Analytical and Applied Pyrolysis |
| Volume | 58-59 |
| DOIs | |
| Publication status | Published - 1 Apr 2001 |
Keywords
- polymide 6
- nylon 6
- thermal degradation
- catalysis
- stepwise pyrolysis
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