PRODUCTION OF POLYESTER USING SCRAP

PROBLEM TO BE SOLVED: To obtain a polycondensate with qualities suitable for its application by conducting the polycondensation of oligomers by changing the kind of polycondensation catalyst depending on the kind of a catalyst compd. or the concn. of a phosphorus compd. contained in a scrap polyeste...

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Bibliographische Detailangaben
Hauptverfasser:	MURAI MASUO, UCHIDA TOSHIO
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT COMPOSITIONS BASED THEREON CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS CONVEYING GENERAL PROCESSES OF COMPOUNDING GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS HANDLING THIN OR FILAMENTARY MATERIAL MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY NATURAL OR ARTIFICIAL THREADS OR FIBRES ORGANIC MACROMOLECULAR COMPOUNDS PACKAGES PACKAGING ELEMENTS PACKING PERFORMING OPERATIONS SPINNING STORING TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE TEXTILES THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING-UP
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To obtain a polycondensate with qualities suitable for its application by conducting the polycondensation of oligomers by changing the kind of polycondensation catalyst depending on the kind of a catalyst compd. or the concn. of a phosphorus compd. contained in a scrap polyester. SOLUTION: An oligomer in the molten state is stirred under heating in a reactor 1, to which a slurry comprising terephthalic acid and ethylene glycol in a molar ratio of (1/1.1)-(1/2.0) is supplied together with a catalyst through a supply pipe 4. On the other hand, a scrap polyester having a content of metal compds. (e.g. Sb2 O3 ) of 10 ppm or lower (in terms of metal atoms) and a content of phosphorus compds. of 20 ppm or lower (in terms of phosphorus) is weighed with a weighing apparatus 6 and then is melted and supplied with an extruder in an amt. of about 30 wt.% of the oligomer. An oligomer formed by the esterification at 220-260 deg.C and having a degree of polymn. of 3-10 is extracted with a pump 9 through an extraction pipe line 8, is filtered with a filter 10, and is sent to the polycondensation step to be reacted in the presence of a GeO2 catalyst, etc., thus giving a polycondensate.