METHOD FOR RECOVERING TEREPHTHALIC ACID WITH HIGH PURITY FROM WASTE GENERATED IN PRODUCTION PROCESS OF TEREPHTHALIC ACID BY CONTROLLING pH

PURPOSE: A method for recovering terephthalic acid is provided, to obtain terephthalic acid with a purity of 93% or more from the second waste obtained by extracting benzoic acid from the first waste generated in the production process of terephthalic acid, by controlling pH. CONSTITUTION: The metho...

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Bibliographische Detailangaben
Hauptverfasser:	KIM, GON PUNG, SIM, YONG HO
Format:	Patent
Sprache:	eng ; kor
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS CHEMISTRY METALLURGY ORGANIC CHEMISTRY
Online-Zugang:	Volltext bestellen
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Beschreibung
Zusammenfassung:	PURPOSE: A method for recovering terephthalic acid is provided, to obtain terephthalic acid with a purity of 93% or more from the second waste obtained by extracting benzoic acid from the first waste generated in the production process of terephthalic acid, by controlling pH. CONSTITUTION: The method comprises the steps of mixing a second waste which is obtained by extracting benzoic acid from a first waste generated in the production process of terephthalic acid, with water and stirring the mixture; dissolving the obtained mixture with a sodium hydroxide solution; and neutralizing the obtained solution with an NaHSO3 solution at a temperature of 3-90 deg.C to obtain a terephthalic acid crystal by precipitation. Preferably the neutralization is carried out at a temperature of 30-90 deg.C.