The invention relates to a polyol displaying specific properties which allow it to be identified accessibly as a recycled polyol, particularly as a recycled polyol obtained from a new specific recycling process.

The invention relates to a polyol displaying specific properties which allow it to be identified accessibly as a recycled polyol, particularly as a recycled polyol obtained from a new specific recycling process.

The invention relates to a process for producing a terephthalate polyester from at least one feedstock of polyester to be recycled, integrating a process of depolymerization, advantageously by glycolysis, of the polyester to be recycled in order to produce a diester intermediate compatible with the specifications of the polymerization steps and comprising an optimized system for recycling the streams.

The invention relates to a process for producing a terephthalate polyester from at least one feedstock of polyester to be recycled, integrating a process of depolymerization, advantageously by glycolysis, of the polyester to be recycled in order to produce a diester intermediate compatible with the specifications of the polymerization steps and comprising an optimized system for recycling the streams.

A process for recycling a stream of polyester waste material by depolymerising the polyester by alcoholysis, includes first and second consecutive stages of depolymerisation, in which the polymer waste material is subjected in a continuous manner, in the first stage, the polyester waste material is continuously fed to an extruder operated at a temperature above the polyester melting temperature, while a first amount of alcohol is co-fed to the extruder, to produce a fluid mixture including a melt of the at least partly depolymerised polyester, and in the second stage, the fluid mixture is continuously fed to a continuously stirred tank reactor (CSTR) operated at a temperature above the polyester melting temperature, while co-feeding a second amount of alcohol to the CSTR, a residence time in the CSTR being used to provide at the CSTR outlet a continuous stream of polyester depolymerised into an oligomeric ester.

A process for recycling a stream of polyester waste material by depolymerising the polyester by alcoholysis, includes first and second consecutive stages of depolymerisation, in which the polymer waste material is subjected in a continuous manner, in the first stage, the polyester waste material is continuously fed to an extruder operated at a temperature above the polyester melting temperature, while a first amount of alcohol is co-fed to the extruder, to produce a fluid mixture including a melt of the at least partly depolymerised polyester, and in the second stage, the fluid mixture is continuously fed to a continuously stirred tank reactor (CSTR) operated at a temperature above the polyester melting temperature, while co-feeding a second amount of alcohol to the CSTR, a residence time in the CSTR being used to provide at the CSTR outlet a continuous stream of polyester depolymerised into an oligomeric ester.

The present disclosure is directed to methods for at least partially removing a dye from a dyed fiber comprising one or more polyamide or polyester polymers, and products formed thereof.

The present disclosure is directed to methods for at least partially removing a dye from a dyed fiber comprising one or more polyamide or polyester polymers, and products formed thereof.

A method of depolymerization of waste polymer material into monomers comprises releasing at least part of the at least one dye from the waste polymer material in an alcoholic solvent without depolymerizing the condensation polymer in the waste polymer material and at conditions preventing a reaction between the dye and the alcoholic solvent, wherein the alcoholic solvent is a polyol. The alcoholic solvent is added in a weight ratio of the alcoholic solvent to the waste polymer material of between 200:1 and 10:1. The at least partially decolorized waste polymer is then separated from the alcoholic solvent, and the at least one dye is extracted from the alcoholic solvent so as to regenerate the alcoholic solvent, which is led to a storage for reuse. The condensation polymer is depolymerized in the purified recovered alcoholic solvent by using a catalyst. A reactor system for carrying out the method is also described.

A method of depolymerization of waste polymer material into monomers comprises releasing at least part of the at least one dye from the waste polymer material in an alcoholic solvent without depolymerizing the condensation polymer in the waste polymer material and at conditions preventing a reaction between the dye and the alcoholic solvent, wherein the alcoholic solvent is a polyol. The alcoholic solvent is added in a weight ratio of the alcoholic solvent to the waste polymer material of between 200:1 and 10:1. The at least partially decolorized waste polymer is then separated from the alcoholic solvent, and the at least one dye is extracted from the alcoholic solvent so as to regenerate the alcoholic solvent, which is led to a storage for reuse. The condensation polymer is depolymerized in the purified recovered alcoholic solvent by using a catalyst. A reactor system for carrying out the method is also described.