Decoloring and purifying method of BHET material

The invention provides a decoloring and purifying method of a BHET material. The decoloring and purifying method comprises the following steps. And adding a first dose of activated carbon to carry out primary treatment on the BHET material. And after the primary treatment, carrying out a first cooling crystallization process and filtering to obtain BHET crystals. Afterwards, an oxidizing agent is used for carrying out chemical reaction on the BHET crystals so as to destroy the dye or impurities, and then a second dosage of activated carbon is added for treatment so as to adsorb oxides obtained after the chemical reaction. And then, carrying out a second cooling crystallization process, filtering and drying to obtain a BHET finished product. 本发明提供一种BHET材料的脱色纯化方法，包括以下步骤。加入第一剂量的活性碳对BHET材料进行初步处理。进行初步处理后，进行第一冷却结晶制程并过滤，以获得BHET晶体。之后，利用氧化剂对BHET晶体进行化学反应，以破坏染料或杂质，再加入第二剂量的活性碳进行处理，以吸附化学反应后的氧化物。接下来，进行第二冷却结晶制程并过滤干燥，以获得BHET成品。