Method for producing regenerated terephthalic acid characterized by not using organic solvent and regenerated terephthalic acid produced thereby
AssigneeTerracle Co., Ltd.
InventorsSeong Eon LEE, Do Wan KIM
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Abstract
Provided are a method for producing regenerated terephthalic acid characterized by not using an organic solvent including mixing waste polyester and an alkaline catalyst, heating the mixture to 80 to 100° C. and sonicating the mixture at a frequency of 20 to 60 kHz and a power of 100 to 5,000 W under 1 atm conditions for 30 minutes to 5 hours, separating a terephthalic acid metal salt by adding water to the sonicated mixture, and treating the separated terephthalic acid metal salt with an acidic solution to precipitate regenerated terephthalic acid, and regenerated terephthalic acid produced thereby.
Claims18
A method for producing regenerated terephthalic acid characterized by not using an organic solvent, the method comprising:
- mixing waste polyester and an alkaline catalyst;
- heating the mixture to 80 to 100□C and sonicating the mixture at a frequency of 20 to 60 kHz and a power of 100 to 5,000 W under 1 atm conditions for 30 minutes to 5 hours;
- separating a terephthalic acid metal salt by adding water to the sonicated mixture;
- and
- treating the separated terephthalic acid metal salt with an acidic solution to precipitate regenerated terephthalic acid.
Regenerated terephthalic acid produced by a method characterized by not using an organic solvent, the method comprising:
- mixing waste polyester and an alkaline catalyst;
- heating the mixture to 80 to 100□C and sonicating the mixture at a frequency of 20 to 60 KHz and a power of 100 to 5,000 W under 1 atm conditions for 30 minutes to 5 hours;
- separating a terephthalic acid metal salt by adding water to the sonicated mixture;
- and
- treating the separated terephthalic acid metal salt with an acidic solution to precipitate regenerated terephthalic acid.
Dependencies are inferred from the claim text.