By using the existing commercial antimony catalyst and the next generation eco-friendly titanium-based catalyst, it is possible to economically reduce the total amount of the catalyst, to reduce the reaction time in the liquid phase polymerization of the polyester, to increase the intrinsic viscosity, A catalyst for ester polymerization and a process for producing polyester using the same are disclosed. The present invention relates to a titanium-based composite metal oxide including titanium (Ti), aluminum (Al), magnesium (Mg), and oxygen (O); And an antimony (Sb)-based compound, and a process for producing a polyester using the catalyst composition.
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