公开(公告)号：US20230081251A1

公开(公告)日：2023-03-16

申请号：US17872287

申请日：2022-07-25

Applicant: NAN YA PLASTICS CORPORATION

Inventor： TE-CHAO LIAO ,  JUNG-JEN CHUANG ,  ZHANG-JIAN HUANG ,  Yu-Ti Tseng ,  CHENG-HSUN CHEN

IPC: C08J11/14 ,  C08J11/16

Abstract: A method for improving a recovery rate of recycled bis(2-hydroxyethyl) terephthalate (BHET) is provided, which includes: providing a recycled polyester fabric; using a chemical de-polymerization liquid to chemically depolymerize the recycled polyester fabric, so as to form a de-polymerization product containing BHET; dissolving the BHET in water to form a aqueous phase liquid; cooling the aqueous phase liquid from a dissolution temperature to a first crystallization temperature, so as to crystallize at least a part of the BHET; and cooling the aqueous phase liquid from the first crystallization temperature to a second crystallization temperature, so as to crystallize at least another part of the BHET.

公开(公告)号：US20230085243A1

公开(公告)日：2023-03-16

申请号：US17864354

申请日：2022-07-13

Applicant: NAN YA PLASTICS CORPORATION

Inventor： TE-CHAO LIAO ,  JUNG-JEN CHUANG ,  ZHANG-JIAN HUANG ,  Yu-Ti Tseng ,  CHENG-HSUN CHEN

IPC: C08J11/24 ,  B01J20/20 ,  B01J20/28 ,  C07C67/54

Abstract: A method for improving the hue of recycled BHET is provided. The method includes: providing a recycled polyester fabric; using a chemical de-polymerization liquid to chemically depolymerize the recycled polyester fabric to form a de-polymerization product; distilling out the chemical de-polymerization liquid from the de-polymerization product by evaporation; dissolving the BHET in water to form a aqueous phase liquid; adding an activated carbon material to the aqueous phase liquid to adsorb impurities; and cooling the aqueous phase liquid to crystallize the BHET from the aqueous phase liquid to obtain a recycled BHET.