Decolorization and purification method of BHET material
AssigneeNan Ya Plastics Corporation
InventorsTe-Chao Liao, Jung-Jen Chuang, Yu Ti Tseng, Zhang-Jian Huang
Life of this patent
Estimating the term…
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.
Claims10
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.
Dependencies are inferred from the claim text.