Patent ID: 7807727
Filing Date: 2010-10-05
Classification: B03B,B29B,B29K,B29L,Y02W

Abstract:
1. Method for selective separation of each of the constituents of a mixture of synthetic organic materials that are polymers and/or copolymers, intended to be upgraded by recycling, having a density of at least 1, in fragmented form, comprising carrying out their separation by introducing said mixture into a dense liquid medium, which is an aqueous suspension of powder particles dispersed in an adequate amount in an aqueous phase, in order to create a density level chosen as the threshold for separation of the various fragmented synthetic organic materials to be selectively separated by type, wherein said separating suspension is made selective, stable and invariant with regard to density at a precision level of ±0.0005 with respect to the density level threshold chosen for the selective separation: a) by the size selection of powder particles having a granulometric cross-section of no more than 5 μm, which solid powder particles thus sized are dispersed and present in an aqueous phase in a sufficient amount to reach the chosen density level threshold, and b) by the implementation of at least one means of dynamic stabilisation by creating a circulating flow of said separating suspension, which circulating flow is at most 40 m