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Process for removing titanium oxide or iron oxide red from depolymerization products obtained by glycolysis of polyesters containing titanium oxide or iron oxide red with ethylene glycol
Process for removing titanium oxide or iron oxide red from depolymerization products obtained by glycolysis of polyesters containing titanium oxide or iron oxide red with ethylene glycol
A process for efficiently removing titanium oxide or red oxide from an ethylene glycol solvolysis product of a polyester containing titanium oxide or red oxide. The process comprises the steps of: (1) mixing at least one calcium compound selected from the group consisting of calcium oxide, calcium carbonate and calcium hydroxide with a polyester decomposition product containing titanium oxide which is an ethylene glycol solvolysis product of a polyester containing titanium oxide to agglomerate titanium oxide contained in the polyester decomposition product, or mixing titanium oxide with a polyester decomposition product containing red oxide which is an ethylene glycol solvolysis product of a polyester containing red oxide to agglomerate red oxide contained in the polyester decomposition product; and (2) subjecting the agglomerates to solid-liquid separation to remove titanium oxide or red oxide from the polyester decomposition product.
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