<p>The invention provides a method of manufacturing polyesters which comprises an esterifying step wherein a dicarboxylic acid and a dihydroxyl compound are esterified and the next liquid phase polycondensation step wherein the resulting ester is subjected to liquid phase polycondensation in the presence of a polycondensation catalyst while a distillate which contains an reacted dihydroxyl compound and the polycondensation catalyst is distilled, wherein the distillate is subjected to a purification treatment comprising: (a) a distilling step; (b) a filtering step; and (c) a decoloring step and then the thus purified distillate is recovered and supplied to the esterifying step. A further method comprises a purification treatment comprising: (a) a distilling step; (b) a depolymerizing step; and (c) a decoloring step. te</p>
