Method for producing recycled polyester chips from recycled polyester fabric

A method for producing recycled polyester chips from a recycled polyester fabric, comprising:

• providing the recycled polyester fabric, wherein the recycled polyester fabric is attached with dyes and coating glue;
• performing a color removal process that includes:
• using an extraction solvent to infiltrate the recycled polyester fabric, so as to remove the coating glue and the dyes from the recycled polyester fabric;
• wherein the extraction solvent is propylene glycol methyl ether, and an extraction temperature of the extraction solvent is higher than a glass transition temperature of the recycled polyester fabric;
• wherein, after the color removal process, a content of the coating glue in the recycled polyester fabric is not greater than 200 ppm;
• performing a de-polymerization process which includes:
• using a chemical de-polymerization liquid to chemically depolymerize the recycled polyester fabric, so as to form a de-polymerization product containing bis(2-hydroxyethyl) terephthalate (BHET) and oligomers;
• performing a purification process, so as to enhance a purity of the BHET in the de-polymerization product;
• and
• performing a granulation process, so as to re-polymerize the purified BHET and form the recycled polyester chips (r-PET).