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

摘要

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.