RECOVERY OF DIMETHYL TEREPHTHALATE

PROBLEM TO BE SOLVED: To enable the smooth progress of a depolymerizing reaction and efficiently recover dimethyl terephthalate from a discarded polyalkylene terephthalate by adding a specific amount of a depolymerizing reactional metal lic catalyst into a reactional system and carrying out the reac...

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Hauptverfasser:	AOYANAGI MITSUHITO, NAKAJIMA MINORU, HASEGAWA HIDEO
Format:	Patent
Sprache:	eng
Schlagworte:	ACYCLIC OR CARBOCYCLIC COMPOUNDS CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOSITIONS BASED THEREON CRACKING HYDROCARBON OILS FUELS LUBRICANTS MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY MINERAL WAXES ORGANIC CHEMISTRY ORGANIC MACROMOLECULAR COMPOUNDS PEAT PERFORMING OPERATIONS PETROLEUM, GAS OR COKE INDUSTRIES PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVEHYDROGENATION, OLIGOMERISATION, POLYMERISATION RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, ORGASES REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS REFORMING OF NAPHTHA TECHNICAL GASES CONTAINING CARBON MONOXIDE THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To enable the smooth progress of a depolymerizing reaction and efficiently recover dimethyl terephthalate from a discarded polyalkylene terephthalate by adding a specific amount of a depolymerizing reactional metal lic catalyst into a reactional system and carrying out the reaction. SOLUTION: A depolymerizing reactional metallic catalyst (preferably manganese, calcium, magnesium, etc.) is added into a reactional system for depolymerizing (A) a polyalkylene terephthalate while continuously introducing (C) methanol into the component (A) at least partially kept in a molten state when recovering (B) dimethyl terephthalate from the component (A), removing the produced component (B) and (D) an alkylene glycol, together with the unreacted component (C), from a reactor and respectively separating and recovering the components (B) and (D) and the unreacted component (C) so that the total amount of a metal assuming depolymerizing reactional activities may be equal gram-atoms or more based on substances for inhibiting the depolymerizing reaction present in the reactional system. Furthermore, the component (A) is preferably produced from the component (B), especially from terephthalic acid.