DEPOLYMERISATION OF POLYAMIDES

摘要

1. Process for depolymerising one or more polyamides in the presence of at least an aliphatic alcohol, the depolymerisation taking place with at most 40 mol.% catalyst which is phosphoric acid, phosphorous acid, polyphosphoric acid, boric acid, sulfuric acid, hyrdochloric acid, ammoniun salts thereof and/or alkali or (earth) metal salts of an alcohol. 2. Process according to claims 1, characterised in that the alcohol has 1-4 C atoms. 3. Process according to any one of claims 1-2, characterised in that the amount of alcohol is between 1 and 100 parts by weight relative to the polyamide or polyamides 4. Process according to any one of claims 1-3, characterised in that the depolymerisation is carried out in the presence of at most 50 wt.% water relative to the polyamide or polyamides. 5. Process according to any one of claims 1-4, characterised in that the alcohol of the caprolactam obtained is separated and reused in the depolymerisation. 6. Process according to any one of claims 1-5, characterised in that the depolymerisation takes place at a temperature of between 180 and 400 degree C. 7. Process according to any one of claims 1-6, characterised in that carpet waste containing polyamide is used in the depolymerisation.