Feedstock engineering of polyester waste for recycling processes
AssigneeTaclov, LLC
InventorsGregory Breyta, Robert David Allen, Nitin Shashikant Parekh
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Abstract
A waste polyester material is prepared for recycling by dissolving the material in a solution comprising hexafluoroisopropyl (HFIPA) and a chlorinated hydrocarbon, such as dichloromethane (DCM) and/or an aromatic hydrocarbon, such as toluene or xylene, to form a dissolved polyester sample. The dissolved polyester may be prepared for recycling by evaporation, spray drying, and/or precipitation, which produces a purified solid polyester product. The dissolution solution, which is separated from the purified solid polyester product, is also recycled through distillation with purification.
Claims20
A method comprising:
- reacting a waste material comprising a polyester with a dissolution solution comprising hexafluoroisopropyl alcohol and a chlorinated hydrocarbon and/or an aromatic hydrocarbon in a glass reactor, wherein the reaction forms a dissolved polyester product;
- removing the dissolved polyester from the glass reactor and filtering the dissolved polyester to form a purified and dissolved polyester;
- and
- treating the purified and dissolved polyester with a technique to produce a solid polyester product, wherein the dissolution solution is separated from the solid polyester product.
A method comprising:
- reacting a waste material comprising polyethylene terephthalate (PET) with a dissolution solution comprising 30% hexafluoroisopropyl alcohol and 70% dichloromethane in a glass reactor, wherein the reaction forms dissolved PET;
- removing the dissolved PET from the glass reactor and filtering the dissolved PET to form a purified and dissolved PET;
- and
- treating the purified and dissolved PET with a technique to produce a solid PET product for reuse, wherein the dissolution solution is separated from the solid PET product.
Dependencies are inferred from the claim text.