Patent ID: 11858891
Assignee: NAN YA PLASTICS CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC C  B  Y | IPC B  C

Claim 0:
1. A decolorization and purification method of BHET (bis(2-Hydroxyethyl) terephthalate) material, comprising:
adding a first dose of activated carbon to preliminarily treat the BHET material;
after the preliminary treatment, performing a first cooling crystallization process and filtration to obtain BHET crystals;
using an oxidant to chemically react with the BHET crystals to destroy a dye or impurities, and then adding a second dose of activated carbon to adsorb a chemically reacted oxide; and
performing a second cooling crystallization process, filtration, and drying to obtain a finished product of BHET.