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US 12,674,037 B2Granted
Method for manufacturing a recycled material composition
AssigneeSK Chemicals Co., Ltd.
InventorsJi-Hun Kim, Gayeong Ryu, Kwang-Woo Park, Joong Ki Lee
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Abstract
The present invention relates to a process for preparing a recycled raw material composition using depolymerization of waste polyester. The preparation process comprises (1) pretreating a waste polyester with an apparent density of 0.1 kg/L or less to have an apparent density of 0.5 kg/L or more; (2) depolymerizing the pretreated waste polyester; and (3) purifying the reactant obtained through the depolymerization.
Claims14
A process for preparing a recycled raw material composition, which comprises:
- (1) pretreating a waste polyester with an apparent density of 0.1 kg/L or less to have an apparent density of 0.5 kg/L or more;
- (2) depolymerizing the pretreated waste polyester;
- and
- (3) purifying a reactant obtained through the depolymerization,
- wherein step (2) comprises:
- (2-1) subjecting the waste polyester whose apparent density has been adjusted to depolymerization through a first glycolysis reaction at a temperature of 180 to 200° C. to obtain a first reactant;
- and
- (2-2) subjecting the first reactant to depolymerization at a temperature of 150 to 170° C. through a second glycolysis reaction to obtain a second reactant.
5 more elements
Dependencies are inferred from the claim text.