METHOD AND APPARATUS FOR RECOVERING ORTHOPHTHALIC ACID, PHTHALIC ANHYDRIDE AND ISOPHTHALIC ACID

• Main Authors: TAKAYANAGI MASAAKI, HIRANO KATSUHIKO, SANO KEIICHIRO
• Format: Patent
• Language: English
• Published: 25.01.2007
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; METALLURGY; ORGANIC CHEMISTRY; ORGANIC MACROMOLECULAR COMPOUNDS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; THEIR PREPARATION OR CHEMICAL WORKING-UP; WORKING-UP

PROBLEM TO BE SOLVED: To provide a recovery method and a recovery apparatus for obtaining at least one of orthophthalic acid, phthalic anhydride and isophthalic acid from an unsaturated polyester resin (e.g. FRP). SOLUTION: In the recovery method, at least one of orthophthalic acid, phthalic anhydride and isophthalic acid is obtained by purifying a crude product, which is obtained by conducting thermolysis of the unsaturated polyester resin (e.g. FRP) and vegetable or animal oils and fats at around 300-360°C in an open-system vessel fed with nitrogen gas etc., and cooling the obtained vaporized product, or alternatively, by conducting the thermolysis at 300-360°C in a pressurized, closed-system vessel filled with nitrogen gas etc., and subsequently cooling the product. The recovery apparatus therefor is also provided. COPYRIGHT: (C)2007,JPO&INPIT