Recycling of waste streams comprising polyamide and an organosilicon compound

Abstract

The present invention is directed to a process for treating a polymeric material (PM) comprising a polyamide based polymer and at least one organic silicon compound (SF1), the process com-prising providing a polymeric material (PM) comprising a polyamide based polymer and at least one organic silicon compound (SF1) and a solvent composition (SC) comprising water; prepar-ing a mixture (M-0) from the polymeric material (PM) and the solvent composition (SC); subject-ing mixture (M-0) to conditions for at least partially depolymerizing the polyamide based polymer (D1) comprising a depolymerization temperature T(D1) and a depolymerization time t(D1) ob-taining a mixture (M-1) comprising the solvent composition (SC), soluble oligomers and optional-ly monomers of the polyamide based polymer, and an insoluble component (SF2) comprising silicon; and separating the insoluble component (SF2) from mixture (M-1) obtaining mixture (M-2) comprising the insoluble component (SF2), and mixture (M-3) comprising the solvent composi-tion (SC) and soluble oligomers and optionally monomers of the polyamide based polymer. Fur-thermore, the present invention is directed to the use of mixture (M-3), obtainable or obtained by a process according to the present invention for preparing polyamide.