Method for recycling polyester fabrics with use of ionic liquid catalyst
AssigneeNan Ya Plastics Corporation
InventorsTe-Chao Liao, Jung-Jen Chuang, Wei-Sheng Cheng, Zhang-Jian Huang, Yu-Ti Tseng
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Abstract
A method for recycling polyester fabrics with use of an ionic liquid catalyst is provided, which includes: providing a recycled polyester fabric; and using a chemical de-polymerization liquid to chemically de-polymerize the recycled polyester fabric and form a de-polymerization product that includes bis-2-hydroxylethyl terephthalate (BHET). The chemical de-polymerization liquid is used to chemically de-polymerize the recycled polyester fabric in an environment where a de-polymerization catalyst exists, and the de-polymerization catalyst is the ionic liquid catalyst in a solid state.
Claims8
A method for recycling polyester fabrics with use of an ionic liquid catalyst, comprising:
- implementing a preparation operation, which includes providing a recycled polyester fabric;
- implementing a de-polymerization operation, which includes using a chemical de-polymerization liquid to chemically de-polymerize the recycled polyester fabric and form a de-polymerization product, wherein the de-polymerization product includes bis-2-hydroxylethyl terephthalate (BHET);
- wherein the de-polymerization operation is to chemically de-polymerize the recycled polyester fabric in an environment where the ionic liquid catalyst is present;
- wherein the ionic liquid catalyst includes a substrate and ionic liquids grafted onto the substrate, the substrate is made of carbon, silicon, iron, nickel, and/or cobalt, and an average particle size of the substrate is between 2 micrometers and 800 micrometers;
- and
- implementing a separation operation, which includes separating the ionic liquid catalyst from the de-polymerization product by one or both of a centrifugal method and a filtering method, so as to collect and recycle the ionic liquid catalyst for use.
Dependencies are inferred from the claim text.