METHOD FOR SEPARATING FOREIGN MATERIAL

• Main Authors: NAKAJIMA MINORU, MIZUNO KAZUMASA
• Format: Patent
• Language: English
• Published: 31.05.2007
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLIDMATERIALS OR FLUIDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS; SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATICTABLES OR JIGS; 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; TRANSPORTING; WORKING-UP

PROBLEM TO BE SOLVED: To establish a method for separating and removing foreign materials contained in polyester waste materials without decreasing the yield of effective components and also safely. SOLUTION: This method for separating the foreign material from the polyester waste materials is provided by putting in the polyester waste materials consisting mainly of a polyalkylene terephthalate and containing the foreign materials other than the polyalkylene terephthalate in a depolymerizing reaction vessel joined with a sedimentation-separating device in which liquid flow on performing the sedimentation-separation moves from the lower direction of the device to upper direction, adding an alkylene glycol to perform the depolymerizing reaction of the part or whole of the polyester to obtain depolymerization reaction liquid, sending the liquid to a next process through the sedimentation-separating device by having 5 to 300 sec residence time of the depolymerization reaction liquid and also by 50-300 mm/sec ascending speed of the depolymerizing reaction liquid, while continuously separating the foreign materials. COPYRIGHT: (C)2007,JPO&INPIT