Method for preparing a recycled material using waste copolyester and recycled material composition
AssigneeSK Chemicals Co., Ltd.
InventorsJi-Hun Kim, Kwang-Woo Park, Joong Ki Lee
Life of this patent
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Abstract
A method for preparing a recycled raw material uses a waste copolyester. The method for preparing a recycled raw material includes (1) depolymerizing a waste copolyester to obtain a first reactant; (2) removing impurities present in the first reactant to obtain a second reactant; (3) distilling the second reactant to obtain a third reactant containing crude recycled bis-2-hydroxyethyl terephthalate and a fourth reactant containing a recycled diol-ester; and (4) mixing the third reactant with an aqueous solvent and recrystallizing it to obtain a fifth reactant containing recycled bis-2-hydroxyethyl terephthalate and a filtrate.
Claims19
A method for preparing a recycled raw material, which comprises:
- (1) depolymerizing a waste copolyester to obtain a first reactant;
- (2) removing impurities present in the first reactant to obtain a second reactant;
- (3) distilling the second reactant to obtain a third reactant comprising crude recycled bis-2-hydroxyethyl terephthalate and a fourth reactant comprising a recycled diol-ester;
- and
- (4) mixing the third reactant with an aqueous solvent and recrystallizing it to obtain a fifth reactant comprising recycled bis-2-hydroxyethyl terephthalate and a filtrate.
Dependencies are inferred from the claim text.