Abstract: A process for depolymerizing plastic waste, including the steps of: a) providing a melt plastic waste feedstock made from or containing recycled polypropylene and b) subjecting the melt product obtained in (a) to a temperature ranging from 280° C. to 600° C., thereby obtaining a depolymerization product; wherein the melt product, the depolymerization product, or both are contacted with a metal organic framework (MOF) catalyst.

Abstract: A method for treating a polymer recyclate to produce an improved depolymerization feed is described. The method comprises providing a polymer recyclate comprising a polyolefin component and a polar polymer component, wherein the polar polymer component comprises heteroatom bonds. The polymer recyclate is subjected to reaction conditions sufficient to degrade at least a portion of heteroatom bonds to produce a degraded polar polymer component and a waste gas comprising hetero-containing compounds. An improved depolymerization feed, comprising the polyolefin component and the degraded polar polymer component, is recovered. Also, disclosed is a depolymerization process comprising a step of pretreating a polymer recyclate according to the disclosed method.

Abstract: A process for depolymerizing plastic waste with a catalyst made from or containing a cement, having an Al2O3/Fe2O3 mass ratio equal to or higher than 5.0. A process for depolymerizing plastics, comprising the steps of: a) providing a plastic waste feedstock; b) mixing the plastic waste feedstock with a catalyst, thereby obtaining a reactant mixture; and c) heating the reactant mixture to a temperature ranging from 280° C. to 600° C., thereby obtaining a depolymerization product, wherein the catalyst is a cement, having an Al2O3/Fe2O3 mass ratio equal to or higher than 5.0.

Abstract: A process for depolymerizing plastics of a plastic waste feedback, using a doped silica catalyst.

Abstract: A process for depolymerizing plastic waste including the steps of: a) providing a melt plastic waste feedstock made from or containing recycled polypropylene and polyethylene; and b) subjecting the melt product obtained in (a) to a temperature ranging from 280° C. to 600° C., thereby obtaining a depolymerization product; wherein the melt product, the depolymerization product, or both are contacted with a catalyst made from or containing a supported heteropolyacid, having a transition metal portion containing transition metals selected from the group consisting of W, Mo, and V and a non-metal portion containing non-metal elements selected from the group consisting of Si, P, and As.

Abstract: Catalytic compositions and processes for depolymerizing polyolefin-based feed into useful petrochemical products are described. The compositions are a composite of a zeolite catalyst component and a co-catalyst comprising an activated clay component and/or a solid base component. These catalyst systems, along with heat, are used to both increase the depolymerization reaction rate of the feed streams and suppress poisoning effects of impurities that may be present in the polyolefin-based feed. This results in a shorter residence time in the depolymerization unit and more efficient process.

Abstract: Catalytic compositions and processes for depolymerizing polyolefin-based feed into useful petrochemical products are described. The compositions are a composite of a zeolite catalyst component and a co-catalyst comprising an activated clay component and/or a solid base component. These catalyst systems, along with heat, are used to both increase the depolymerization reaction rate of the feed streams and suppress poisoning effects of impurities that may be present in the polyolefin-based feed. This results in a shorter residence time in the depolymerization unit and more efficient process.