Method for decolorizing PETG alcoholysis product

The invention relates to a decoloration method of PETG alcoholysate, and belongs to the technical field of decoloration treatment of PETG alcoholysate. The decolorization method of the PETG alcoholysis product comprises the following steps: (1) carrying out cooling crystallization on an alcoholysis...

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Hauptverfasser: WANG HONGLEI, SHA LIANFENG, YAN YINFENG, LI JUAN, LI HONGKUN, LI LILI, ZHOU HONGTAO, WANG GUOLIAN, LI YUANHONG, LIU GUANGBIN
Format: Patent
Sprache:chi ; eng
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Zusammenfassung:The invention relates to a decoloration method of PETG alcoholysate, and belongs to the technical field of decoloration treatment of PETG alcoholysate. The decolorization method of the PETG alcoholysis product comprises the following steps: (1) carrying out cooling crystallization on an alcoholysis solution of PETG, and carrying out solid-liquid separation to obtain a BHET coarse crystal; and (2) dissolving the BHET coarse crystal in ethylene glycol with the mass 2-6 times that of the BHET coarse crystal, adding an adsorption decolorizing agent, stirring at the temperature not lower than 60 DEG C for 2 hours, separating insoluble substances, cooling, crystallizing, carrying out solid-liquid separation, washing with water, and drying to obtain the refined BHET crystal. The obtained refined BHET crystal is relatively high in yield, purity and whiteness, so that the refined BHET crystal is beneficial to recycling, and efficient recycling of PETG alcoholysis products is realized. 本申请涉及一种PETG醇解物的脱色方法,属于PETG醇解物的脱色处