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...

Full description

Saved in:
Bibliographic Details
Main Authors KIM, GON PUNG, SIM, YONG HO
Format Patent
LanguageEnglish
Korean
Published 16.06.2004
Edition7
Subjects
ACYCLIC OR CARBOCYCLIC COMPOUNDS
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
Online AccessGet full text

Cover

More Information
Summary: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.
Bibliography:Application Number: KR19960022104