公开(公告)号：US20250051536A1

公开(公告)日：2025-02-13

申请号：US18467701

申请日：2023-09-14

Applicant: NAN YA PLASTICS CORPORATION

Inventor： Te-Chao Liao ,  Jung-Jen Chuang ,  Yu Ti Tseng ,  Zhang-Jian Huang

IPC: C08J11/24 ,  C08G63/183 ,  C08J11/02

Abstract: A method of recycling polyester fabric includes following steps. A polyester fabric including polyethylene terephthalate and dyes is provided. An extraction process including using ethylene glycol as an extraction solvent, immersing the polyester fabric in the extraction solvent, and extracting under a temperature of 80° C. to 180° C. is performed to remove the dyes from the polyester fabric. A depolymerization process including using a chemical depolymerization solution to depolymerize the polyester fabric treated with the extraction process to obtain a product including BHET is performed. The chemical depolymerization solution is ethylene glycol. A purification process is performed to remove impurities of the product obtained by the depolymerization process and to obtain a purified BHET. A solvent recycling process is performed. The solvent recycling process includes collecting waste solutions of the extraction process and the depolymerization process, and recycling ethylene glycol in the waste solutions by a distillation separating system.

公开(公告)号：US11858891B2

公开(公告)日：2024-01-02

申请号：US17570351

申请日：2022-01-06

Applicant: NAN YA PLASTICS CORPORATION

Inventor： Te-Chao Liao ,  Jung-Jen Chuang ,  Yu Ti Tseng ,  Zhang-Jian Huang

IPC: C07C67/52 ,  B01J20/20 ,  B01D15/08 ,  B01D9/00 ,  C07C67/48 ,  C07C67/60

CPC classification number: C07C67/52 ,  B01D9/0004 ,  B01D15/08 ,  B01J20/20 ,  C07C67/48 ,  C07C67/60 ,  B01D2009/0086

Abstract: The disclosure provides a decolorization and purification method of BHET material, which includes the following steps. A first dose of activated carbon is added to preliminarily treat the BHET material. After the preliminary treatment, a first cooling crystallization process and filtration are performed to obtain BHET crystals. Afterwards, an oxidant is used to chemically react with the BHET crystals to destroy a dye or impurities, and then a second dose of activated carbon is added to adsorb a chemically reacted oxide. Next, a second cooling crystallization process, filtration, and drying are performed to obtain a finished product of BHET.

公开(公告)号：US20230147792A1

公开(公告)日：2023-05-11

申请号：US17570351

申请日：2022-01-06

Applicant: NAN YA PLASTICS CORPORATION

Inventor： Te-Chao Liao ,  Jung-Jen Chuang ,  Yu Ti Tseng ,  Zhang-Jian Huang

IPC: C07C67/52 ,  B01J20/20 ,  B01D9/00 ,  B01D15/08

CPC classification number: C07C67/52 ,  B01D9/0004 ,  B01D15/08 ,  B01J20/20 ,  B01D2009/0086

Abstract: The disclosure provides a decolorization and purification method of BHET material, which includes the following steps. A first dose of activated carbon is added to preliminarily treat the BHET material. After the preliminary treatment, a first cooling crystallization process and filtration are performed to obtain BHET crystals. Afterwards, an oxidant is used to chemically react with the BHET crystals to destroy a dye or impurities, and then a second dose of activated carbon is added to adsorb a chemically reacted oxide. Next, a second cooling crystallization process, filtration, and drying are performed to obtain a finished product of BHET.